1. Advantages of ceramic dry powder iron remover: 1. The structure of the whole machine is simple, and the transmission part is naked, which realizes the rapid maintenance and repair in the proction process
2, the transmission principle of the machine is very simple, the operation does not use water, and no sewage is generated, which effectively protects the environment
3. The sorting bucket of the machine is equipped with adjustable dividing plates, which are made of stainless steel, which can effectively ensure the service life of the machine, and avoid the possibility of rust affecting the mineral grade
4. The grade is obviously improved. The grade can be effectively improved after three roller magnetic separation. Compared with ordinary calcite iron removal equipment, the grade is increased by at least 10-15 grades
2. "GEC environmental protection coin" is suspected of pyramid selling, which is deceptive
"GEC environmental protection coin" trading mode has been widely spread, which takes "ecological environment protection", "zero investment", "zero risk" and "high income" as labels, and draws people into the partnership to pull down the development capital chain. Instry experts pointed out that the environmental protection coin can basically be classified as a circle. The appearance of disk circle is virtual currency, and the core is capital disk. The former's income comes from the later's capital. This model is not only suspected of ICO in disguise, but also suspected of MLM
extended information:
"GEC environmental protection coin" is obviously in line with the nature of pyramid scheme
one is to solicit customers with extremely high returns and declare that they only go up but not down, which has great attraction to investors
the second is to build the head MLM framework, build the membership mode, and realize the viral sales of GEC
Third, its sales and operation dare not be exposed to the "sunshine", but only through private means such as wechat group, which has the attributes of high concealment and avoiding supervision. Above all, the income model of "GEC environmental protection coin" has seriously deviated from the nature of
bitcoin like assets, and even violated relevant laws and regulations. It is suggested that investors should guard against similar virtual currency investment model. He Nanye further stressed that this kind of mode can be identified as ICO, the core is illegal ICO, and the means is MLM mode
3. The equipment needed for the ore powder proction line includes the main equipment, vertical mill, and the rest are auxiliary equipment: motor, st collector, finished proct bin, conveyor belt, belt conveyor, elevator, feeder, etc
working principle of main equipment:
slag enters into the mill through the screw feeder, and the material falls to the center of the grinding plate under the action of gravity. The grinding plate is connected with the recer and rotates at a constant speed. Through the rotation of the grinding plate, the material is evenly distributed on the lining plate of the grinding plate. Under the pressure of the hydraulic system, the grinding plate is connected with the recer, The grinding roller nips the slag material and grinds it
under the action of centrifugal force, the crushed slag is thrown to the edge of the grinding plate, and most of it is blown back to the grinding plate to continue grinding under the action of high-speed air in the wind ring, and part of the powdery material rises to the separator through the middle shell of the mill with the high-speed air. In this process, the material and hot gas are fully heat exchanged, and the water is evaporated rapidly, so that the remaining water is less than 1%. The materials that have not been ground to the specified requirements are selected by the separator and sent back to the grinding plate for regrinding. The materials passing through the separator enter the st collector with the air flow
process flow of slag proction line:
the stacked slag is picked up and fed by forklift and transported by belt conveyor. In the process of transportation, slag raw materials are removed and screened by iron remover and vibrating screen, and then enter the vertical mill for grinding through weighing equipment bin and hoist. With the help of the hot air provided by the hot blast stove, the ground slag is selected by the powder concentrator and dried at the same time. The slag powder meeting the fineness requirements is finally transported to the st collector for collection and storage, and then enters the finished proct warehouse for storage by air conveying chute and elevator
profile of vertical mill:
4. The influence of mineral powder on the performance of concrete can be studied graally from "mineral powder + cement paste" to "mineral powder + cement mortar" and then to "mineral powder concrete". But for ordinary application units, such as commercial concrete mixing plant, it is not necessary to follow this rule. We can learn from the relevant research results and directly carry out concrete test to find out the reasonable mix proportion under specific conditions. 1. The influence of mineral powder on the workability and mechanical properties of concrete 1) the specific surface area of mineral powder is between 430m2 / kg and 520m2 / kg, and the content of mineral powder is between 30% and 40%. 2) The results show that the single addition of mineral powder can improve the cohesion of concrete, prolong the setting time and increase the bleeding, which may bring some adverse effects on the pumping of concrete; 3) The concrete compounded with mineral powder and grade I fly ash can give full play to their "complementary effect", increase the slump of concrete, improve the workability, cohesiveness and bleeding. At the same time, the cost of concrete can be significantly reced. 4) In view of the cement fly ash mineral powder cementitious material system, under the premise of equal replacement, the appropriate amount of fly ash is not more than 20%, and the appropriate amount of fly ash and mineral powder is not more than 40%. At the same time, it is suggested to use the 60d or 90d strength as the concrete evaluation standard, so as to make full use of the later strength of concrete. 2. The influence of mineral powder on the rability of concrete 1) hydration heat of concrete. The hydration heat of slurry can be reced by adding mineral powder. When the content of mineral powder is less than 50%, the rection of hydration heat is not obvious. When the content reaches 70%, the hydration heat of 3D and 7d decreases by 36% and 29% respectively; When 20% mineral powder and 20% fly ash are used, the hydration heat of slurry in 3D and 7d can be reced by 38% and 20% respectively. For mass concrete with strict temperature control, the mixture of mineral powder and fly ash is an ideal mineral admixture, which can effectively rece the risk of early temperature shrinkage cracks of concrete. 2) Impermeability. Adding mineral powder or the mixture of mineral powder and fly ash into concrete can play the micro aggregate effect and secondary hydration reaction of admixtures, which can refine the pore size of concrete, rece the connected pores, improve the compactness of concrete, and greatly improve the impermeability of concrete. The results show that the mineral powder, fly ash and air entraining agent can rece the permeability of concrete by Coulomb method. The finer the mineral powder is, the greater the content is. Especially when the mineral powder is combined with fly ash and air entraining agent, the permeability of concrete can be significantly reced; According to nel method, for C30 concrete, the amount of mineral powder, fineness and re mixing can not significantly rece the chloride diffusion coefficient in concrete, while the appropriate air entraining agent can significantly rece the permeability of concrete. For C50 concrete, the permeability of concrete can be significantly reced by mineral powder and its compound admixtures with fly ash, especially by air entraining agent. 3) Carbonation resistance. Under the condition of the same strength, the concrete with mineral powder has the same anti carbonation ability as the ordinary portland cement concrete. 4) Freeze thaw resistance. Adding mineral powder can improve the freeze-thaw resistance of concrete to a certain extent, and the increase range is 25 ~ 50 times with the different concrete grades. Under the same strength and air content, the freeze-thaw resistance of mineral powder concrete and ordinary portland cement concrete is basically the same; It is necessary to add air entraining agent properly, air content and spacing coefficient properly for the freeze-thaw resistance of concrete. The air content of mineral powder concrete can reach 3-4%, and the freeze-thaw cycles of concrete can reach more than 250 times. In addition, replacing part of ordinary portland cement with mineral powder does not affect the efficiency of air entraining agent, and there is no need to increase the amount of air entraining agent. 5) Shrinkage of concrete. According to the current standard test, in the preparation of C30 grade concrete, the dry shrinkage value of concrete with 40% mineral powder of 430m2 / kg has little change compared with the reference concrete; In the preparation of C50 grade concrete, adding 40% of 520m2 / kg mineral powder, the dry shrinkage value of concrete increases to a certain extent, and the increase in the early stage (3 and 7 days) is larger than that in the later stage. When the fineness of mineral powder varies from 430m 2 / kg to 520m 2 / kg, the influence on the dry shrinkage value of concrete is not obvious. The results show that the dry shrinkage value of concrete is obviously increased when the mineral powder and fly ash are mixed together. The higher the concrete grade is, the greater the increase range is. Considering the autogenous shrinkage of the first three days, whether C30 concrete or C50 concrete is mixed with mineral powder, the shrinkage value has no obvious change compared with the reference concrete. 6) Concrete crack resistance. The results show that the effect of improving the crack resistance of the mixture of fly ash and mineral powder is better than that of the mixture of fly ash and mineral powder, which may be e to the low early strength of the mixture. The early strength of concrete has an important influence on the early crack resistance of concrete. The higher the 24-hour strength of concrete, the easier the early crack of concrete. There may be a critical value between the early crack resistance and the early strength of concrete. If the strength value is less than the critical value, the concrete is not easy to crack. If the strength value is greater than the critical value, the concrete is easy to crack. The value is related to the environmental conditions and constraint state. Application of slag powder in commercial concrete mixing plant in recent years, the application of Beijing mineral powder in commercial concrete mixing plant has developed rapidly with the commissioning of Tanglong and Shoujia mineral powder proction lines. In order to better use mineral powder, rece problems and avoid accidents, this paper discusses some application experience for your reference. 1. Strictly control the quality of ore powder, especially the fineness of ore powder. At present, the fineness of slag powder proced by large vertical mill slag powder proction line is controlled in the range of 400-500m2 / kg. Because of its advanced proction technology, the fineness of slag powder is very stable, which brings great convenience to the preparation of concrete. However, the fineness of ball milled ore powder is difficult to reach above 400m2 / kg. Even if the grinding time is prolonged and the energy consumption is increased, it is difficult to reach above 400m2 / kg for a long time. Once its fineness is greatly reced, it will bring many problems to concrete, such as: the decrease of cohesion, segregation and bleeding; The setting time is prolonged; The early strength decreased, and even the 28 day strength also decreased in varying degrees. This is one of the reasons why the application of mineral powder is limited before the vertical mill. Therefore, it is necessary to strengthen the detection when using ball mill powder. 2. Avoid blindly increasing the dosage driven by interests. 1) 30% ～ 40% is suitable for single ore powder. The mass concrete can be increased to more than 50% to rece the hydration heat. 2) The total amount of substitution should not exceed 50%. Fly ash should be controlled within 20% and mineral powder within 30%. 3) It is suggested that fly ash and mineral powder should be controlled within 10% and 20% respectively at the initial stage of use, and that mass concrete should be relaxed appropriately. Although the content of mineral powder within 70% has little effect on the strength of concrete, there are many problems in practical application. Two of them deserve special attention. One is the setting time of concrete. When the content is too high, because the concrete temperature of thin-walled structure is very fast and the environment temperature is the same, the setting time of concrete will be significantly longer, which is not concive to construction. For the vertical structure, because the concrete is in the plastic state for a long time, the concrete will have a large settlement shrinkage, and the circular cracks along the stirrups often appear. The setting time of mass concrete is not. Because it can accumulate heat of hydration, the setting time is often much shorter than the test. Therefore, using large amount of mineral powder or the mixture of mineral powder and fly ash can rece the heat of hydration and delay the setting time, which is beneficial to mass concrete. The other is the cohesiveness of concrete. We know that with the improvement of concrete strength grade, the cohesion of concrete is increasing, so there are two problems in the preparation of concrete. It is necessary to increase the viscosity of low strength concrete to rece the possibility of segregation and bleeding; High strength concrete has high cohesiveness, so it is necessary to rece its viscosity to ensure its construction performance. Because the fineness of ore powder above 400m2 / kg can increase the viscosity of concrete, it is concive to the preparation of low strength concrete but not concive to the preparation of high strength concrete. When preparing high strength concrete, it needs mineral powder and high quality grade I fly ash which can rece the viscosity of concrete. 3. In the process of compound mixing, the appropriate compound proportion should be selected according to different grades of fly ash. When slag powder is used in commercial concrete mixing plant, it is often combined with fly ash. This is because, first of all, fly ash is cheaper than mineral powder, which is unfavorable to the cost of concrete. Although the cost can be greatly reced by adding fly ash alone, the amount of fly ash is limited; Second, make full use of their "complementary advantages" to improve the performance of concrete. 1) Slag powder is compounded with grade II fly ash. When the mineral powder is combined with grade II fly ash, the replacement amount of fly ash should be controlled within 15%, and the mineral powder should be controlled within 30%. As the source of grade II fly ash is wider than that of grade I fly ash and the supply is sufficient, it is widely used in commercial concrete mixing plant. However, the quality stability of grade II fly ash is very poor, and the technicians of mixing plant using grade II fly ash often worry about it. The quality stability of mineral powder is much better than that of grade II fly ash, which brings us a good choice to prepare concrete. As long as we find out the appropriate proportion and dosage through experiments, we can prepare concrete with good workability and obvious increase in cost. If conditions permit, mineral powder should be used as much as possible to rece the adverse effect of grade II fly ash quality fluctuation on concrete. In fact, the principle of concrete preparation is applicable to any raw material. That is to say, when the raw materials with poor quality or poor quality stability have to be used, they should be used as little as possible on the basis of sufficient tests and on the premise that conditions permit. In addition, grade II fly ash and slag powder have the same tendency to increase the viscosity of concrete, so it is not suitable to prepare high strength concrete. 2) Slag powder is compounded with grade I fly ash. The best combination should be the combination of mineral powder and grade I fly ash. Fly ash can be controlled within 20% and mineral powder can be controlled within 40%. The proportion between them can be adjusted according to different strength grades and different technical requirements. In terms of strength, the 28d strength of concrete is basically lower than that of blank concrete when the same amount of fly ash replaces cement, while the 28d strength of concrete will be slightly improved when the appropriate amount of mineral powder is added, so the two have a good "strength complementary effect". At the same time, the combination of the two can give consideration to both the early strength and the late strength of concrete, give full play to the pozzolanic effect of mineral powder in the early stage, improve the interface structure of paste and aggregate, and make up for the lag of the pozzolanic effect of fly ash behind the hydration of cement clinker, As a result, the amount of gel generated from the reaction of volcano ash and cement hydration leads to the early strength loss caused by the unbonding between the interface and the unreacted fly ash (from the modern concrete technology, edited by Huang Shiyuan et al.). In the later stage, the pozzolanic effect of grade I fly ash can refine the pore size and the "core effect" of unreacted fly ash particles can continuously improve the later strength of concrete. From the aspect of concrete cohesion, mineral powder has the tendency to increase the cohesion and bleeding of concrete, while grade I fly ash can obviously rece the cohesion and bleeding of concrete. The complementary advantages of the two are more obvious, which is suitable for preparing various strength grades of concrete
5. Mineral powder is a kind of high fineness and high activity powder obtained from water quenched blast furnace slag after drying, grinding and other processes. It is a high-quality concrete admixture and cement mixture. It is recognized as an important material for preparing high-performance concrete in the world. The use of granulated blast furnace slag powder can effectively improve the compressive strength of concrete and rece the cost of concrete. At the same time, it can restrain the alkali aggregate reaction, rece the hydration heat, rece the early temperature cracks of concrete structure, improve the compactness of concrete, and improve the anti permeability and anti erosion ability
mineral powder is a general term for stone powder and its substitutes that meet the engineering requirements. It is the proct of ore crushing and processing, the first step of ore processing and smelting, and one of the most important steps. The hydrophilic coefficient of mineral powder is the ratio of the expansion volume of unit mineral powder in the same volume of water (polar molecules) and kerosene (nonpolar molecules). In highway engineering, the hydrophilic coefficient of mineral powder & lt; 1 is called alkaline mineral powder
< H2 > extended data
the role of adding mineral powder in concrete:
adding fly ash, mineral powder and other active mineral admixtures in concrete can not only solve the problem of reusing these instrial wastes, but also save resources, rece energy consumption, and improve the workability and rability of concrete Improve the compressive strength and rability
most commercial concrete mixing plants still use the method of adding or not adding mineral admixtures in proction. Although the effects of several mineral admixtures have been studied, few of them have been applied. Fly ash and mineral powder are traditional instrial waste, belonging to pozzolanic active materials
6. [the rapid solidification of concrete has nothing to do with mineral powder] adding mineral powder can not speed up the setting speed of concrete, on the contrary, adding too much mineral powder will prolong the setting time of concrete. This is because the mineral powder will increase the viscosity of concrete, thus prolonging the setting time of concrete. The main factors affecting the setting time of concrete are as follows:
1. Air temperature: the higher the air temperature is, the faster the setting time is
2. Cement type: the setting time of cement mixed with mixture is longer, for example, the setting time of slag cement is longer than that of ordinary cement of the same grade, and the setting time of lower grade cement is longer than that of higher grade cement
3. Concrete grade: when other conditions are the same, the setting time of concrete shortens with the increase of grade
4. Water cement ratio: with the increase of water cement ratio, the setting time increases
5. Slump: generally, with the increase of slump, the setting time can be prolonged
6. Admixture: adding a small amount of retarder can prolong the initial setting time and final setting time of concrete
7. Curing environment: the setting time of concrete in water is longer than that in air
[principle of adding mineral powder] its mechanism is that mineral powder participates in the secondary hydration reaction and absorbs a large amount of CH crystal in the reaction process, which makes the ch crystal in concrete, especially in the interface transition zone, smaller and less. Due to the absorption of CH, the hydration rate of C3S and C2S is accelerated, the interfacial bond strength between cement paste and aggregate and the pore structure of cement paste are improved, and the compactness of concrete is improved. So the strength of concrete is improved
that is to say, the early strength of the concrete mixed with mineral powder is not affected, while the later strength of the concrete increases rapidly e to the continuous participation of mineral powder in the secondary hydration reaction. From the experimental results, the greater the amount of mineral powder, the faster the concrete strength increases.
7. [strength of mineral powder] the ground mineral powder has the characteristics of self hydration and hardening, which can be self hydration and hardening after mixing with water and has strength. When the Portland cement is excited, its activity will be more fully developed
different from fly ash, fly ash does not have its own hydration and hardening characteristics, and can only have strength under the action of active activator (such as Portland cement)
[mineral powder] is a general term for stone powder and its substitutes that meet the engineering requirements. It is the proct of ore crushing and processing, the first step of ore processing and smelting, and one of the most important steps. The hydrophilic coefficient of mineral powder is the ratio of the expansion volume of unit mineral powder in the same volume of water (polar molecules) and kerosene (nonpolar molecules). In highway engineering, the hydrophilic coefficient of mineral powder & lt; 1 is called alkaline mineral powder.
8. Function:
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adding appropriate amount of mineral powder can improve the fluidity of concrete, rece the hydration heat of cement, improve the impermeability of concrete, improve the strength in advanced and later stage, improve the internal structure of concrete, and improve the impermeability and corrosion resistance
It can delay the hydration rate of cementitious materials and prolong the setting time of concrete, which is beneficial to the transportation and construction of concrete in high temperature season
3. Rece the cost
main composition: in fact, it is the abbreviation of granulated blast furnace slag powder. With granulated blast furnace slag as the main raw material, it can be ground into a certain fineness powder by adding a small amount of gypsum, which is called granulated blast furnace slag powder
development data:
concrete
fly ash and mineral powder are traditional instrial wastes, belonging to pozzolanic active materials. They contain more active SiO2 and active Al2O3, and can react with Ca (OH) 2 to form stable calcium silicate hydrate and calcium aluminate hydrate at room temperature. These components help to harden the mixture and increase its strength
In addition, there are a lot of spherical glassy particles in fly ash and mineral powder, which are the main reasons for the improvement of the workability of the mixture. At the same time, the particle size of fly ash and mineral powder is smaller than that of cement particles, which can fill the gap of cement particles and form the densest accumulation, which is concive to the development of strength. Each kind of mineral admixture has its own characteristics. When making concrete, we should give full play to their respective advantages and make full use of the good technical coupling between fly ash and mineral powder, that is, we should make full use of the glass spherical morphology effect, pozzolanic effect, filling effect and good activity of fly ash to give full play to their comprehensive functions, The concrete has good workability and low price the use of fly ash and mineral powder in concrete proction can effectively protect the environment, improve the workability of concrete and rece the cost of concrete. The influence of different proportions of fly ash and mineral powder on the workability and strength of concrete at different ages is studied. It is found that the workability of concrete is significantly improved after adding fly ash and mineral powder, the growth rate of early strength (7D) is low, the growth rate of middle strength is fast, and there is still a large growth space for later strength. The performance differences of concrete with fly ash and mineral powder are compared. Through the composite blending of fly ash and mineral powder, adjust the blending ratio between them, give full play to the comprehensive function between them
Network mineral powder
9. 1. At present, there are S75, S95, S105 and S115 grades of ore powder, which are mainly classified by specific surface area or particle size of ore powder; Because the grinding of S105 and S115 mineral powder is difficult, and the previous process is not easy to proce, S75 and S95 mineral powder are relatively mature in concrete at present. The higher the grade of mineral powder, the easier it is to proce high strength and high performance concrete. The test shows that at present, S115 mineral powder can proce C130 high strength and high performance concrete; The main components of ore powder are calcium oxide, silicon dioxide, aluminum oxide and magnesium oxide, accounting for more than 95%
However, the smaller the particle size of S95 mineral powder, the darker the color will be. D97 mineral powder at 5 microns belongs to medium gray by naked eye. To distinguish the true from the false, we can only do mineral powder composition analysis. If it is mineral powder grade identification, we can basically do particle size analysis; The specific indexes of mineral powder for concrete are water demand ratio, water content, specific surface area, SO3, chloride ion, MgO content, 3D, 7d, 28d activity index, etc; Other stone powder basically can not replace mineral powder, because the composition is different
10. You can go to "China Asphalt Pavement network" to have a look. This website was established in 2012, and now it is the most authoritative website in this field, which can help you solve this problem.
