Mineral powder mixer
Publish: 2021-04-19 04:11:45
1. When jiapurui slag mill is working, the main motor drives the spindle and rotary table to rotate through the recer, and the roller pin at the edge of the rotary table drives dozens of grinding rollers to roll in the grinding ring raceway. After the large materials are broken into small particles by hammer crusher, they are sent to the storage bin by the elevator, and then evenly sent to the bulk tray at the upper part of the rotary table through the vibrating feeder and the inclined feeding pipe. Under the action of centrifugal force, the material disperses around the circle and falls into the raceway of the grinding ring. It is impacted, rolled and ground by the ring roller. After three-layer processing, it becomes powder. The high-pressure fan sucks the external air into the machine through suction, and brings the crushed material into the powder separator. The rotating impeller in the pulverizer makes the coarse material fall back for regrinding. The fine powder that meets the requirements enters the cyclone collector with the air flow and is discharged by the discharge valve at the lower part of the cyclone collector. The air flow with a small amount of fine st is discharged through the fan and muffler after being purified by the pulse st collector. You can refer to their pictures and see them clearly.
2.
The small simple concrete mixing plant is composed of material conveyor belt, mixing machine and batching machine
Material transportation consists of three parts:aggregate transportation. The advantages of belt conveyor are large conveying distance, high efficiency and low failure rate. Belt conveyor is mainly applied to the mixing plant with aggregate temporary storage bin, so as to improve the proctivity of the mixing plant
powder transportation: the available powder for concrete is mainly cement, fly ash and mineral powder. Screw conveyor is widely used in powder conveying. The advantages of screw conveying are simple structure, low cost and reliable use
Liquid transportation: mainly refers to water and liquid additives, which are respectively transported by water pump2. The main mixing machine is divided into forced mixing and self falling mixing according to its mixing mode. Forced mixer is the mainstream of mixing plant at home and abroad. It can mix many kinds of concrete, such as fluidity, semi-rigid and rigid. Self falling mixer is mainly used to mix mobile concrete, which is rarely used in mixing plant
The batching machine is used to store and measure all kinds of aggregate in concrete or asphalt mixing plant, and transport it to the mixer according to the preset formula, and mix with cement, fly ash, mineral powder, additives, water, etc. to form concrete 
extended data:
basic requirements of the equipment
1. The weighing should be fast, and the maximum quantity of each weighing should be greater than the demand of the mixer for the material, so as to ensure that the mixer will not idle because of waiting for ingredients
The accuracy or error of proportioning should meet the requirements of concrete construction technology. Due to the impact of falling materials and the distance between the feeding device and the weighing bucket, the weighing can not reach the expected accuracy. Therefore, it is generally stipulated that the weighing error of cement, water, coarse and fine aggregate and additive is 1%, 1%, 2% and 1% of the material weight In order to meet the needs of preparing various grades of concrete, the weighing equipment should be able to quickly change the weighing weight. Fourthly, the structure of the weighing device should be simple, the operation and control should be convenient and reliable3. The specific configuration can be reced or complicated. Generally, the js750 main machine is equipped with climbing bucket. If the concrete quality requirements are not high, it doesn't need automatic batching. Just buy a main machine with climbing bucket, and use a small forklift refitted by a tractor to add materials to the climbing bucket. The concrete mixing plant is composed of mixing system, aggregate supply system, metering system, control system and external supporting equipment. Forced mixer is the mainstream of mixing plant at home and abroad. It can mix many kinds of concrete, such as fluidity, semi-rigid and rigid. The self falling mixer is mainly used to mix the flowing concrete, which is rarely used in the mixing plant at present. According to the structure, the forced mixer can be divided into planetary mixer, single horizontal shaft mixer and double horizontal shaft mixer. Among them, the comprehensive performance of double horizontal shaft forced mixer is the best< The aggregate supply system consists of three parts
aggregate conveying: at present, there are hopper conveying and belt conveying in the mixing station. The advantages of hopper lifting are small floor area and simple structure. The advantages of belt conveyor are large conveying distance, high efficiency and low failure rate. Belt conveyor is mainly applied to the mixing plant with aggregate temporary storage bin, so as to improve the proctivity of the mixing plant
powder conveying: the available powder for concrete is mainly cement, fly ash and mineral powder. At present, screw conveyor is widely used in powder conveying, and pneumatic conveying and scraper conveying are used in large mixing plants. The advantages of screw conveying are simple structure, low cost and reliable use
liquid material transportation: mainly refers to water and liquid additives, which are respectively transported by water pump< The measurement system is the key component that affects the quality and proction cost of concrete, which is mainly divided into three parts: aggregate weighing, powder weighing and liquid weighing. In general, the mixing plant with less than 20 cubic meters per hour adopts the superposition weighing method, that is, aggregate (sand and stone) is weighed with a scale, cement and fly ash are weighed with a scale, water and liquid admixtures are weighed separately, and then liquid admixtures are put into the water scale bucket for pre mixing. In the mixing station with more than 50 cubic meters per hour, the independent weighing method of each weighing material is mostly used, and all weighing is controlled by electronic scale and microcomputer. The weighing accuracy of aggregate is less than 2%, and the weighing accuracy of cement, powder, water and admixture is less than 1%.
4. Control system
the control system of mixing station is the central nervous system of the whole equipment. The control system has different functions and configurations according to the different requirements of users and the size of the mixing station. Generally, the control system of the small mixing station available at the construction site is simpler, while the system of the large mixing station is more complex
5. Composition of external supporting equipment
aggregate conveying: at present, there are hopper conveying and belt conveying in the mixing station. The advantages of hopper lifting are small floor area and simple structure. The advantages of belt conveyor are large conveying distance, high efficiency and low failure rate. Belt conveyor is mainly applied to the mixing plant with aggregate temporary storage bin, so as to improve the proctivity of the mixing plant
powder conveying: the available powder for concrete is mainly cement, fly ash and mineral powder. At present, screw conveyor is widely used in powder conveying, and pneumatic conveying and scraper conveying are used in large mixing plants. The advantages of screw conveying are simple structure, low cost and reliable use
liquid material transportation: mainly refers to water and liquid additives, which are respectively transported by water pump< The measurement system is the key component that affects the quality and proction cost of concrete, which is mainly divided into three parts: aggregate weighing, powder weighing and liquid weighing. In general, the mixing plant with less than 20 cubic meters per hour adopts the superposition weighing method, that is, aggregate (sand and stone) is weighed with a scale, cement and fly ash are weighed with a scale, water and liquid admixtures are weighed separately, and then liquid admixtures are put into the water scale bucket for pre mixing. In the mixing station with more than 50 cubic meters per hour, the independent weighing method of each weighing material is mostly used, and all weighing is controlled by electronic scale and microcomputer. The weighing accuracy of aggregate is less than 2%, and the weighing accuracy of cement, powder, water and admixture is less than 1%.
4. Control system
the control system of mixing station is the central nervous system of the whole equipment. The control system has different functions and configurations according to the different requirements of users and the size of the mixing station. Generally, the control system of the small mixing station available at the construction site is simpler, while the system of the large mixing station is more complex
5. Composition of external supporting equipment
4. Scale it down to see how many liters you make. Take a mix proportion and rece it to the required proportion
5. Zhengzhou Tongding Machinery Equipment Co., Ltd. specializes in dry powder mortar mixing equipment, dry powder mixer, mortar mixer, dry powder mixer, putty powder mixer, stone paint mixer! Specializing in the proction of river sand dryer, quartz sand dryer, three return dryer and so on!
6. In general, the mix proportion of regular engineering should be reported by the laboratory, which includes volume ratio, weight ratio and the ratio of each plate. Generally speaking, you can calculate the amount of mixing on site and calculate it by weight ratio. The value of cement is 1, others are calculated according to the ratio. Generally, there is no fixed mix proportion, because sand and gravel have an impact on it.
7. With a scale, cement and fly ash with a scale, water and liquid admixtures were weighed respectively, and then the liquid admixtures were put into the water hopper for pre mixing. In the mixing station with more than 50 cubic meters per hour, the independent weighing method of each weighing material is mostly used, and all weighing is controlled by electronic scale and microcomputer. The weighing accuracy of aggregate is less than 2%, and the weighing accuracy of cement, powder, water and admixture is less than 1%.
1. The material conveying system is composed of three parts. Aggregate transportation; At present, there are hopper conveying and belt conveying in mixing station. The advantages of hopper lifting are small floor area and simple structure. The advantages of belt conveyor are large conveying distance, high efficiency and low failure rate. Belt conveyor is mainly applied to the mixing plant with aggregate temporary storage bin, so as to improve the proctivity of the mixing plant. Powder conveying; The available powder materials for concrete are mainly cement, fly ash and mineral powder. At present, screw conveyor is widely used in powder conveying, and pneumatic conveying and scraper conveying are used in large mixing plants. The advantages of screw conveying are simple structure, low cost and reliable use. Liquid transportation mainly refers to water and liquid admixtures, which are respectively transported by pumps< 2. Material storage system
the available material storage methods of concrete are basically the same. The aggregate is piled in the open air (there are also closed silos for large commercial concrete mixing plants in cities); The powder is stored in a closed steel silo; Admixtures are stored in steel containers< The control system of mixing plant is the central nervous system of the whole equipment. The control system has different functions and configurations according to the different requirements of users and the size of the mixing station. Generally, the control system of the small mixing station available at the construction site is simpler, while the system of the large mixing station is more complex<
supplement:
the concrete mixing plant is mainly composed of five systems, including mixing host, material weighing system, material conveying system, material storage system and control system, and other ancillary facilities< The main mixer is divided into forced mixer and self falling mixer according to its mixing mode. Forced mixer is the mainstream of mixing plant at home and abroad. It can mix many kinds of concrete, such as fluidity, semi-rigid and rigid. The self falling mixer is mainly used to mix the flowing concrete, which is rarely used in the mixing plant at present
according to the structure, the forced mixer can be divided into planetary mixer, single horizontal shaft mixer and double horizontal shaft mixer. Among them, the comprehensive performance of double horizontal shaft forced mixer is the best. The company's series of mixing plants all use double horizontal shaft forced mixer< Material weighing system is a key component that affects the quality of concrete and the cost of concrete proction. It is mainly divided into three parts: aggregate weighing, powder weighing and liquid weighing. In general, the mixing station with less than 20 cubic meters per hour adopts the superposition weighing method, that is, aggregate (sand, stone)
1. The material conveying system is composed of three parts. Aggregate transportation; At present, there are hopper conveying and belt conveying in mixing station. The advantages of hopper lifting are small floor area and simple structure. The advantages of belt conveyor are large conveying distance, high efficiency and low failure rate. Belt conveyor is mainly applied to the mixing plant with aggregate temporary storage bin, so as to improve the proctivity of the mixing plant. Powder conveying; The available powder materials for concrete are mainly cement, fly ash and mineral powder. At present, screw conveyor is widely used in powder conveying, and pneumatic conveying and scraper conveying are used in large mixing plants. The advantages of screw conveying are simple structure, low cost and reliable use. Liquid transportation mainly refers to water and liquid admixtures, which are respectively transported by pumps< 2. Material storage system
the available material storage methods of concrete are basically the same. The aggregate is piled in the open air (there are also closed silos for large commercial concrete mixing plants in cities); The powder is stored in a closed steel silo; Admixtures are stored in steel containers< The control system of mixing plant is the central nervous system of the whole equipment. The control system has different functions and configurations according to the different requirements of users and the size of the mixing station. Generally, the control system of the small mixing station available at the construction site is simpler, while the system of the large mixing station is more complex<
supplement:
the concrete mixing plant is mainly composed of five systems, including mixing host, material weighing system, material conveying system, material storage system and control system, and other ancillary facilities< The main mixer is divided into forced mixer and self falling mixer according to its mixing mode. Forced mixer is the mainstream of mixing plant at home and abroad. It can mix many kinds of concrete, such as fluidity, semi-rigid and rigid. The self falling mixer is mainly used to mix the flowing concrete, which is rarely used in the mixing plant at present
according to the structure, the forced mixer can be divided into planetary mixer, single horizontal shaft mixer and double horizontal shaft mixer. Among them, the comprehensive performance of double horizontal shaft forced mixer is the best. The company's series of mixing plants all use double horizontal shaft forced mixer< Material weighing system is a key component that affects the quality of concrete and the cost of concrete proction. It is mainly divided into three parts: aggregate weighing, powder weighing and liquid weighing. In general, the mixing station with less than 20 cubic meters per hour adopts the superposition weighing method, that is, aggregate (sand, stone)
8. The activity index, fluidity ratio and fineness still depend on whether the mixing station has high requirements for the auxiliary material of mineral powder
detailed rules for the implementation of mineral powder detection
2011-12-07 20:51:20 | classification: default classification | font subscription
I. scope of application & lt; xmlnamespace prefix =" o" ns =" urn:schemas-microsoft-com : office:office" /& gt;
the detailed rules are applicable to the determination of density, specific surface area (Brinell method), magnesium oxide, loss on ignition, sulfur trioxide, fluidity ratio and activity index of granulated blast furnace slag powder< 2. Technical standards
1. Methods for determination of density of cement (GB / T 208-94)
2. Methods for chemical analysis of cement (GB / T 176-1996)
3. Method for determination of specific surface area of cement (Brinell method) (GB 8074-87)
4. Granulated blast furnace slag powder for cement and concrete (GB / T 18046-2000)
3 The number of each test item is as follows:
name of test item
density
specific surface area
magnesium oxide
loss on ignition
sulfur trioxide
fluidity ratio
activity index
number
1
2
3
4
5
6
7
2<
instruments and equipment used for testing
specifications
requirements for instruments and equipment
1
Li's bottle
1
balance
maximum weighing 100g, graation value ≤ 0.05g
2
air permeability meter
/
2
analytical balance
graation value 1mg
2
stopwatch
precision 0.5s
2
oven
/
2,4 5
dryer
/
3,4,5
analytical balance
division value 0.1mg
3
magnetic stirrer
/
3
atomic absorption spectrometer
/
4,5
muffle furnace
temperature can be controlled at about 1000 ℃
5
beaker
300ml
6
vernier caliper
/
6
cement mortar fluidity tester
/
6 7
balance
weighing 1200g, sensitivity 0.1g
6 7
cement mortar mixer
JC / T681
7
mold test
JC / t726
7
tamping table
JC / t682
7
flexural strength testing machine
JC / t724
7
compressive strength testing machine
precision 1%
7
compression fixture
JC / t683
7
curing box
/
7
curing pool
/
IV. testing items Technical requirements:
item
grade
S105
S95
S75
density, g / cm3 not less than
2.8
specific surface area, M / kg not less than
350
activity index, and% not less than
7d
95
75
55
28d
105
95
75
fluidity ratio, %No less than
85
90
95
sulfur trioxide,%, no more than
4.0
loss on ignition,%, no more than
3.0
magnesium oxide,%, no more than
14
v. inspection before testing
1. Before testing, check whether the room temperature humidity of soft training meets the specification requirements, If it does not meet the requirements, start the equipment to meet the requirements before testing
2. Check whether the circuit connection of instruments and equipment is correct, and whether there is circuit damage and leakage
3. Turn on the power supply and run the instruments and equipment without load to determine whether they are running normally
4. Check whether the test water is clear and transparent, and whether it meets the test requirements< 6. Test steps and data processing
1. Density
(1). After injecting anhydrous kerosene into Li's bottle to 0-1ml scale mark (subject to the lower part of meniscus), cover the bottle stopper and put it into a constant temperature water bath, so that the scale part is immersed in water (the water temperature should be controlled at the temperature of Li's bottle scale), keep the constant temperature for 30min, and record the initial (first) reading
(2) take out the Li's bottle from the constant temperature water tank, and use filter paper to carefully wipe the part without kerosene in the slender neck of Li's bottle
(3) the sample should pass through the 0.90mm square hole sieve in advance and pass through the 110 mm square hole sieve in advance ± Dry at 5 ℃ for 1 h and cool in a dryer to room temperature. Weigh 60g of ore powder to 0.01g
(4) put the sample into the Li's bottle of (1) with a small spoon, shake it repeatedly (or use ultrasonic vibration) until no bubbles are discharged, then put the Li's bottle in a constant temperature water bath again, keep it at constant temperature for 30min, and record the second reading< The temperature difference between the first reading and the second reading is not more than 0.2 ℃< Results calculation
① the volume of mineral powder should be the second reading minus the initial (first) reading, that is, the volume of anhydrous kerosene discharged by mineral powder (ML).
② the density of mineral powder ρ( G / cm3) calculated by the following formula:
mineral powder density ρ= The results are calculated to the third decimal place, and the whole number is taken to 0.01g/cm3. The test results are taken as the arithmetic mean of the two determination results, and the difference between the two determination results shall not exceed 0.02 g / cm3
2. Specific surface area
(1) air leakage inspection
plug the upper opening of the air cylinder with a rubber stopper and connect it to the pressure gauge. Use the air extraction device to extract part of the gas from the pressure gauge arm, and then close the valve to observe whether there is air leakage. In case of air leakage, seal with piston grease< (2) determination of the volume of the test layer (1) mercury displacement method: put two pieces of filter paper into the cylinder along the cylinder wall and press down with a slender rod whose diameter is slightly smaller than that of the permeable cylinder until the filter paper is flat and placed on the perforated metal plate. Then fill it with mercury, and use a thin glass plate to gently press the mercury surface to make the mercury surface flush with the cylinder opening, and ensure that there are no bubbles or cavities between the glass plate and the mercury surface. Pour the Mercury out of the cylinder and weigh it to the accuracy of 0.05g. Repeat the determination several times until the value is basically unchanged. Then, take out a piece of filter paper from the cylinder, and use about 3.3g cement to compact the ore powder layer. Then inject mercury into the upper space of the cylinder, remove bubbles, flatten, pour out mercury and weigh it in the same way as above, and repeat several times until the difference of mercury weighing value is less than 50mg
note: solid ore powder layer should be prepared. If it is too loose or the ore powder can not be pressed to the required volume, the trial amount of ore powder should be adjusted
2. The volume of sample layer V in the cylinder is calculated according to the following formula. Accurate to 0.005cm3
V = (P1-P2)/ ρ Mercury
V --- volume of sample layer, cm3
P1 --- the mass of mercury filled in the cylinder without ore powder, G
P2 --- the mass of mercury in the cylinder filled with ore powder, G< br /> ρ Mercury ---- the density of mercury at the test temperature, g / cm3
③. The volume of sample layer should be measured at least twice. Each time, it shall be compacted separately, and the average value of the difference between the two values shall not exceed 0.005cm3, and the temperature near the cylinder ring the measurement shall be recorded. The volume of sample layer should be corrected every quarter to half a year< (3) test steps:
① ± The standard sample dried at 5 ℃ and cooled to room temperature in the dryer is poured into a 100ml closed bottle and shaken for 2min. The agglomerated sample is crushed to make the sample loose. After standing for 2min, open the bottle cap and gently stir to make the fine powder falling on the surface ring the loosening process distribute into the whole sample
2. The sample of ore powder should pass through 0.9mm square hole sieve first, and then pass through 110mm square hole sieve ± Dry at 5 ℃ and cool in a desiccator to room temperature
3. The amount of standard sample for calibration test and the quality of mineral powder to be determined should reach the porosity of 0.500 in the prepared sample layer ± 005, the formula is
W= ρ V ( 1 - ε)
W --- amount of sample required, G< br /> ρ---- Sample density, g / cm3
V --- measured volume of sample layer, cm3< br /> ε---- The porosity of the sample layer
4. Put the perforated plate on the flange of the air permeable cylinder, use a small diameter rod to send a piece of filter paper to the perforated plate, and press the edge. Weigh the amount of mineral powder determined in the previous section, accurate to 0.001g, and pour it into the cylinder. Tap the edge of the cylinder gently to make the surface of the powder layer flat. Then put in a piece of filter paper, and tamp the sample evenly with a vibrator until the support ring of the vibrator tightly contacts the top edge of the cylinder and rotates for two circles, and then slowly take out the vibrator
⑤. Connect the gas permeable cylinder with the test layer to the pressure gauge to ensure that it is tightly connected without air leakage and vibration of the prepared test layer
6. Turn on the micro electromagnetic pump and slowly draw air from the pressure gauge arm until the liquid level in the pressure gauge rises to the lower end of the expansion part and close the valve. When the meniscus of the liquid in the manometer drops to the first scale line, the timer starts. When the meniscus of the liquid drops to the second scale line, the timer stops. Record the time required for the liquid level from the first scale line to the second scale line. Record in seconds and record the temperature (℃) ring the test< Calculation
(4)
①. When the density and porosity of the tested material are the same as those of the standard sample, and the temperature difference ring the test is ≤ 3 ℃, the calculation is as follows:
s = SS T1 / 2 / TS1 / 2
if the temperature difference ring the test is greater than 3 ℃ ± At 3 ℃, it is calculated as follows:
s = SS T1 / 2 η s1/2 / [ Ts1/2 η 1 / 2]
s -- specific surface area of the tested sample, cm2 / g
SS -- specific surface area of standard sample; Cm2 / G:
T -- the time of the liquid level falling in the manometer, s
TS -- the time measured by the liquid level drop in the pressure gauge ring the standard sample test, s< br /> η—— The air viscosity of the tested sample at the test temperature, Pa.s< br /> η S -- air viscosity of standard sample at test temperature, Pa.s
2. When the void ratio in the test layer of the tested sample is different from that in the standard sample layer, and the temperature difference ring the test is ≤ 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2] / [Ts1/2 (1- ε) ( ε S3) 1 / 2]
if the temperature difference is greater than ± At 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 η s1/2] / [Ts1/2 (1- ε) ( ε s3)1/2 η 1/2]
ε---- The porosity in the test layer of the tested sample< br /> ε When the density and porosity of the tested sample are different from those of the standard sample, and the temperature difference ring the test is ≤ 3 ℃, the calculation is as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 ρ s]/ [Ts1/2 (1- ε) ( ε s3)1/2 ρ]
if the temperature difference is greater than ± At 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 ρ s η s1/2] / [Ts1/2 (1- ε) ( ε s3)1/2 ρη 1/2]
ρ---- Density of tested sample, g / cm3< br /> ρ S --- density of standard sample, g / cm3.
4. The specific surface area of ore powder should be determined by the average value of secondary air permeability test results. If the difference between the results of the second test is more than 2%, the test shall be repeated. The calculation shall be accurate to 10cm2 / g, and values below 10cm2 / g shall be rounded< (5) when the specific surface area calculated in the unit of 10cm2 / G is converted to m2 / kg, it needs to be multiplied by a factor of 0.1< 3. Magnesium oxide
1) hydrofluoric acid perchloric acid decomposition
weigh about 0.1g sample M1, accurate to 0.000lg, put it in a platinum crucible (or platinum dish), wet it with 0.5 ~ 1ml water, add 5 ~ 7ml hydrofluoric acid and 0.5ml perchloric acid, and evaporate it on an electric heating plate. Shake the platinum crucible to prevent splashing when it is nearly dry, and cool it down after the white smoke is exhausted. Add 20ml hydrochloric acid (1 + 1), warm the solution to orange white, remove and cool. Transfer to 250 ml volumetric flask. Add 5 ml strontium chloride solution, dilute with water to the mark, and shake well. This solution B was used as raw material
detailed rules for the implementation of mineral powder detection
2011-12-07 20:51:20 | classification: default classification | font subscription
I. scope of application & lt; xmlnamespace prefix =" o" ns =" urn:schemas-microsoft-com : office:office" /& gt;
the detailed rules are applicable to the determination of density, specific surface area (Brinell method), magnesium oxide, loss on ignition, sulfur trioxide, fluidity ratio and activity index of granulated blast furnace slag powder< 2. Technical standards
1. Methods for determination of density of cement (GB / T 208-94)
2. Methods for chemical analysis of cement (GB / T 176-1996)
3. Method for determination of specific surface area of cement (Brinell method) (GB 8074-87)
4. Granulated blast furnace slag powder for cement and concrete (GB / T 18046-2000)
3 The number of each test item is as follows:
name of test item
density
specific surface area
magnesium oxide
loss on ignition
sulfur trioxide
fluidity ratio
activity index
number
1
2
3
4
5
6
7
2<
instruments and equipment used for testing
specifications
requirements for instruments and equipment
1
Li's bottle
1
balance
maximum weighing 100g, graation value ≤ 0.05g
2
air permeability meter
/
2
analytical balance
graation value 1mg
2
stopwatch
precision 0.5s
2
oven
/
2,4 5
dryer
/
3,4,5
analytical balance
division value 0.1mg
3
magnetic stirrer
/
3
atomic absorption spectrometer
/
4,5
muffle furnace
temperature can be controlled at about 1000 ℃
5
beaker
300ml
6
vernier caliper
/
6
cement mortar fluidity tester
/
6 7
balance
weighing 1200g, sensitivity 0.1g
6 7
cement mortar mixer
JC / T681
7
mold test
JC / t726
7
tamping table
JC / t682
7
flexural strength testing machine
JC / t724
7
compressive strength testing machine
precision 1%
7
compression fixture
JC / t683
7
curing box
/
7
curing pool
/
IV. testing items Technical requirements:
item
grade
S105
S95
S75
density, g / cm3 not less than
2.8
specific surface area, M / kg not less than
350
activity index, and% not less than
7d
95
75
55
28d
105
95
75
fluidity ratio, %No less than
85
90
95
sulfur trioxide,%, no more than
4.0
loss on ignition,%, no more than
3.0
magnesium oxide,%, no more than
14
v. inspection before testing
1. Before testing, check whether the room temperature humidity of soft training meets the specification requirements, If it does not meet the requirements, start the equipment to meet the requirements before testing
2. Check whether the circuit connection of instruments and equipment is correct, and whether there is circuit damage and leakage
3. Turn on the power supply and run the instruments and equipment without load to determine whether they are running normally
4. Check whether the test water is clear and transparent, and whether it meets the test requirements< 6. Test steps and data processing
1. Density
(1). After injecting anhydrous kerosene into Li's bottle to 0-1ml scale mark (subject to the lower part of meniscus), cover the bottle stopper and put it into a constant temperature water bath, so that the scale part is immersed in water (the water temperature should be controlled at the temperature of Li's bottle scale), keep the constant temperature for 30min, and record the initial (first) reading
(2) take out the Li's bottle from the constant temperature water tank, and use filter paper to carefully wipe the part without kerosene in the slender neck of Li's bottle
(3) the sample should pass through the 0.90mm square hole sieve in advance and pass through the 110 mm square hole sieve in advance ± Dry at 5 ℃ for 1 h and cool in a dryer to room temperature. Weigh 60g of ore powder to 0.01g
(4) put the sample into the Li's bottle of (1) with a small spoon, shake it repeatedly (or use ultrasonic vibration) until no bubbles are discharged, then put the Li's bottle in a constant temperature water bath again, keep it at constant temperature for 30min, and record the second reading< The temperature difference between the first reading and the second reading is not more than 0.2 ℃< Results calculation
① the volume of mineral powder should be the second reading minus the initial (first) reading, that is, the volume of anhydrous kerosene discharged by mineral powder (ML).
② the density of mineral powder ρ( G / cm3) calculated by the following formula:
mineral powder density ρ= The results are calculated to the third decimal place, and the whole number is taken to 0.01g/cm3. The test results are taken as the arithmetic mean of the two determination results, and the difference between the two determination results shall not exceed 0.02 g / cm3
2. Specific surface area
(1) air leakage inspection
plug the upper opening of the air cylinder with a rubber stopper and connect it to the pressure gauge. Use the air extraction device to extract part of the gas from the pressure gauge arm, and then close the valve to observe whether there is air leakage. In case of air leakage, seal with piston grease< (2) determination of the volume of the test layer (1) mercury displacement method: put two pieces of filter paper into the cylinder along the cylinder wall and press down with a slender rod whose diameter is slightly smaller than that of the permeable cylinder until the filter paper is flat and placed on the perforated metal plate. Then fill it with mercury, and use a thin glass plate to gently press the mercury surface to make the mercury surface flush with the cylinder opening, and ensure that there are no bubbles or cavities between the glass plate and the mercury surface. Pour the Mercury out of the cylinder and weigh it to the accuracy of 0.05g. Repeat the determination several times until the value is basically unchanged. Then, take out a piece of filter paper from the cylinder, and use about 3.3g cement to compact the ore powder layer. Then inject mercury into the upper space of the cylinder, remove bubbles, flatten, pour out mercury and weigh it in the same way as above, and repeat several times until the difference of mercury weighing value is less than 50mg
note: solid ore powder layer should be prepared. If it is too loose or the ore powder can not be pressed to the required volume, the trial amount of ore powder should be adjusted
2. The volume of sample layer V in the cylinder is calculated according to the following formula. Accurate to 0.005cm3
V = (P1-P2)/ ρ Mercury
V --- volume of sample layer, cm3
P1 --- the mass of mercury filled in the cylinder without ore powder, G
P2 --- the mass of mercury in the cylinder filled with ore powder, G< br /> ρ Mercury ---- the density of mercury at the test temperature, g / cm3
③. The volume of sample layer should be measured at least twice. Each time, it shall be compacted separately, and the average value of the difference between the two values shall not exceed 0.005cm3, and the temperature near the cylinder ring the measurement shall be recorded. The volume of sample layer should be corrected every quarter to half a year< (3) test steps:
① ± The standard sample dried at 5 ℃ and cooled to room temperature in the dryer is poured into a 100ml closed bottle and shaken for 2min. The agglomerated sample is crushed to make the sample loose. After standing for 2min, open the bottle cap and gently stir to make the fine powder falling on the surface ring the loosening process distribute into the whole sample
2. The sample of ore powder should pass through 0.9mm square hole sieve first, and then pass through 110mm square hole sieve ± Dry at 5 ℃ and cool in a desiccator to room temperature
3. The amount of standard sample for calibration test and the quality of mineral powder to be determined should reach the porosity of 0.500 in the prepared sample layer ± 005, the formula is
W= ρ V ( 1 - ε)
W --- amount of sample required, G< br /> ρ---- Sample density, g / cm3
V --- measured volume of sample layer, cm3< br /> ε---- The porosity of the sample layer
4. Put the perforated plate on the flange of the air permeable cylinder, use a small diameter rod to send a piece of filter paper to the perforated plate, and press the edge. Weigh the amount of mineral powder determined in the previous section, accurate to 0.001g, and pour it into the cylinder. Tap the edge of the cylinder gently to make the surface of the powder layer flat. Then put in a piece of filter paper, and tamp the sample evenly with a vibrator until the support ring of the vibrator tightly contacts the top edge of the cylinder and rotates for two circles, and then slowly take out the vibrator
⑤. Connect the gas permeable cylinder with the test layer to the pressure gauge to ensure that it is tightly connected without air leakage and vibration of the prepared test layer
6. Turn on the micro electromagnetic pump and slowly draw air from the pressure gauge arm until the liquid level in the pressure gauge rises to the lower end of the expansion part and close the valve. When the meniscus of the liquid in the manometer drops to the first scale line, the timer starts. When the meniscus of the liquid drops to the second scale line, the timer stops. Record the time required for the liquid level from the first scale line to the second scale line. Record in seconds and record the temperature (℃) ring the test< Calculation
(4)
①. When the density and porosity of the tested material are the same as those of the standard sample, and the temperature difference ring the test is ≤ 3 ℃, the calculation is as follows:
s = SS T1 / 2 / TS1 / 2
if the temperature difference ring the test is greater than 3 ℃ ± At 3 ℃, it is calculated as follows:
s = SS T1 / 2 η s1/2 / [ Ts1/2 η 1 / 2]
s -- specific surface area of the tested sample, cm2 / g
SS -- specific surface area of standard sample; Cm2 / G:
T -- the time of the liquid level falling in the manometer, s
TS -- the time measured by the liquid level drop in the pressure gauge ring the standard sample test, s< br /> η—— The air viscosity of the tested sample at the test temperature, Pa.s< br /> η S -- air viscosity of standard sample at test temperature, Pa.s
2. When the void ratio in the test layer of the tested sample is different from that in the standard sample layer, and the temperature difference ring the test is ≤ 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2] / [Ts1/2 (1- ε) ( ε S3) 1 / 2]
if the temperature difference is greater than ± At 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 η s1/2] / [Ts1/2 (1- ε) ( ε s3)1/2 η 1/2]
ε---- The porosity in the test layer of the tested sample< br /> ε When the density and porosity of the tested sample are different from those of the standard sample, and the temperature difference ring the test is ≤ 3 ℃, the calculation is as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 ρ s]/ [Ts1/2 (1- ε) ( ε s3)1/2 ρ]
if the temperature difference is greater than ± At 3 ℃, it is calculated as follows:
s = [SS T1 / 2 (1- ε s) ( ε 3)1/2 ρ s η s1/2] / [Ts1/2 (1- ε) ( ε s3)1/2 ρη 1/2]
ρ---- Density of tested sample, g / cm3< br /> ρ S --- density of standard sample, g / cm3.
4. The specific surface area of ore powder should be determined by the average value of secondary air permeability test results. If the difference between the results of the second test is more than 2%, the test shall be repeated. The calculation shall be accurate to 10cm2 / g, and values below 10cm2 / g shall be rounded< (5) when the specific surface area calculated in the unit of 10cm2 / G is converted to m2 / kg, it needs to be multiplied by a factor of 0.1< 3. Magnesium oxide
1) hydrofluoric acid perchloric acid decomposition
weigh about 0.1g sample M1, accurate to 0.000lg, put it in a platinum crucible (or platinum dish), wet it with 0.5 ~ 1ml water, add 5 ~ 7ml hydrofluoric acid and 0.5ml perchloric acid, and evaporate it on an electric heating plate. Shake the platinum crucible to prevent splashing when it is nearly dry, and cool it down after the white smoke is exhausted. Add 20ml hydrochloric acid (1 + 1), warm the solution to orange white, remove and cool. Transfer to 250 ml volumetric flask. Add 5 ml strontium chloride solution, dilute with water to the mark, and shake well. This solution B was used as raw material
9. Closed concrete mixing plant is very good! In line with the current national environmental policy, it is beneficial to both the people and the people. It is suggested that the commercial concrete station should use the closed mixing station, which has no impact on the surrounding schools and pharmaceutical factories.
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