A2 miner
Publish: 2021-04-23 03:07:45
1. The mining principle of lightcoin is the same as that of bitcoin, but the algorithm is different. In short, it is to use the computing power of your lightcoin mining equipment to solve mathematical problems, confirm lightcoin network transactions, and ensure the security of the entire lightcoin network system. As a reward, miners can get unequal lightcoin rewards. The total number of lightcoin is four times that of bitcoin
at present, lightcoin mining has entered the ASIC era, and the myth that ASIC was not suitable for lightcoin mining has been broken
if you want to mine the Leyte coin, it is recommended that you buy ASIC Leyte coin miner, and you'd better join a mine pool for mining. The more famous lightcoin machines in the market include A2, silverfish, KNC and so on. At present, Avalon, a famous supplier of bitcoin machines, also plans to research and develop lightcoin ASIC chips. Avalon's lightcoin chip is a 28nm process technology, which is in a leading position in the instry.
at present, lightcoin mining has entered the ASIC era, and the myth that ASIC was not suitable for lightcoin mining has been broken
if you want to mine the Leyte coin, it is recommended that you buy ASIC Leyte coin miner, and you'd better join a mine pool for mining. The more famous lightcoin machines in the market include A2, silverfish, KNC and so on. At present, Avalon, a famous supplier of bitcoin machines, also plans to research and develop lightcoin ASIC chips. Avalon's lightcoin chip is a 28nm process technology, which is in a leading position in the instry.
2. Changchun Jinyan Resources Comprehensive Utilization Technology Development Co., Ltd. developed gravity separation equipment spiral centrifugal fluidization concentrator, low-grade recycling and tailings comprehensive utilization. Is set technology, proction, sales as one of the company. The company has a group of innovative, sincere cooperation of R & D team, firmly believe that proct quality is the soul of the enterprise. R & D of gravity separation equipment spiral centrifugal fluidization concentrator, procts are welcomed by customers.
3. It should be available in longkuang technology. Longkuang technology does not proce chips, but the assembled mining machines are sold very well. It has a certain popularity and reputation in the instry.
4. Renren blockchain service enables users to quickly build their own IT infrastructure and blockchain services in an elastic and open cloud. Using baas can greatly rece the cost of realizing the underlying technology of the blockchain, simplify the construction and operation and maintenance of the blockchain. At the same time, facing various instry scenarios, it can meet the personalized needs of users and quickly deliver customized baas in one stop.
5. You go to longkuang science and technology zone to consult. Longkuang science and technology is one of the world's largest lightcoin miner.
6. Now the highest computing power is 110m A2 chip miner, power consumption is 1000W. The daily income is good and the noise is low. Bitstone is sold in his family. The running speed is stable.
7. The power consumption theory of crusher, also known as crushing theory, is a theory to study the relationship between crushing process and crushing energy consumption. Although human beings have used crushing tools for thousands of years, it is still a matter of the last century to put forward the crushing theory. Since crushing is a process of recing the particle size of materials, it is necessary to apply external force to the materials to overcome the cohesive force between the particles inside the materials, that is, to do work on the materials, work to transform the deformation energy. When the deformation reaches the limit, crushing can occur. Therefore, from the mechanical point of view, crushing is a process of function transformation. In practical application, the energy consumption of crushing is very large, for example, 40-60% of the dynamic consumption in crushing and grinding in concentrator, which will inevitably cause people's attention, so there are some crushing power consumption, in order to find the way of energy saving crushing. At present, the generally accepted theories of crushing power consumption include area theory, volume theory and fracture theory< The area theory was put forward by the German scholar P. R. rittinger in 1867, which is the earliest systematic fragmentation theory. As a matter of fact, the particles on the surface of a material are different from those inside. The surface of the material is different. Therefore, retinger thinks that when l material is broken, the function of external force is used to generate new surface area, that is, the power consumption of breaking A1, and the new surface area Δ If the scale coefficient is K1, then A1 = K1 Δ S
it is assumed that the power consumption of crushing an ore is da ˊ= R1 · DS
where R1 -- proportional coefficient (work required to generate a unit new surface), also known as specific surface energy
if D is the diameter of the ore block, K1 and K2 are the shape coefficients of the surface proct and volume calculated by the diameter, then K1d2 and k2d2 are the surface area and volume respectively. δ Is the weight of ore per unit volume, then the ore with weight Q contains the number of ore blocks with diameter n = Q/ δ K2d3), so the work required for crushing d from ore to D is
A1 =
= (8-7a)
or (8-7b)
in the formula, when D is fixed, the power consumption is proportional to the crushing ratio minus 1; when I is fixed, the power consumption A1 is inversely proportional to the raw material particle size D< Second, the volume theory was independently put forward by Russian scholar Kirchhoff and German scholar Kirk. According to the volume theory, when the material is broken, the function of the external force on the material is to deform the material. When the deformation reaches the limit, the material is broken. And the stored deformation energy of the material is directly proportional to the volume. It is considered that the power consumption A2 of the crusher is related to the volume deformation of the material Δ If the scale coefficient is K2, then A2 = K2 Δ V
according to the derivation method of area theory formula, the power consumption formula of volume theory can also be deced as follows:
A2 = 2.303k2qlgi (8-8)
where K2 is the comprehensive proportion coefficient (, where R2 is the work required to crush the material per unit volume)< It can be seen from the equation (8-8) that the power consumption of crushing unit weight material A2 is proportional to the logarithm of crushing ratio I< In 1952, F.C. bond put forward a formula to calculate crushing power consumption, which is in the original form of
(8-9)
where W is the work consumed to crush a short ton (907.175kg) of material with a feed size of F to a particle size of P, kW · H / short t
F and P -- the square mesh width through which 80% of the feed and discharge can pass, respectively, μ m
wi -- work index; KW · H / short t
wi is an infinite particle size in theory, 80% of which can pass through 100% μ M mesh width (or 65% can pass 200 mesh mesh mesh width), which to a certain extent represents the degree of difficulty of material crushing, i.e. crushing or grindability
after establishing the above empirical formula, and then looking for a theoretical explanation, Bangde explained that: when crushing materials, the work done by the external force first deforms the object, and when the deformation exceeds the limit, cracks will be generated. After the cracks are formed, the deformation stored in the object can promote the crack expansion and generate cross-section. The useful part of the input work transforms into the surface energy on the new surface, and the other part becomes the heat loss. Therefore, the work required for crushing should be considered in terms of deformation energy and surface energy. The deformation energy is proportional to the volume, and the surface energy is proportional to the surface area. Assuming that the two terms are considered equally, the work required should be proportional to their geometric mean, that is, to. For an object of unit volume, it is proportional to
according to Bangde's explanation, the power consumption A3 required for crushing the mineral with weight of Q from D to D is
(8-10)
where K3 -- comprehensive proportion coefficient
among the above three theories, the Bangde fracture theory has great application value. The key in application is to measure the work index wi, which has more than one measurement and calculation method. Bonde proposed several methods to calculate the work index by measuring the fragility and grindability of ores in the laboratory:
(1) using the special double penlum impact tester designed by Bonde to measure the impact crushing strength of ores, and then measure the true density of ores, The crushing work index of ore is calculated by the following formula:
wi = 2.59c/sg (* - 11)
(2) d is used × L is 305 × The grindability coefficient (GRP (g) of 610 Bangde rod mill is measured for the newly generated material below P1 in each revolution; The particle sizes of F80 and p80 (both below 80% of the test mesh) in the ore and proct were determined μ m) The work index wt of ball mill is calculated as follows:
wick = 62 / &# 91 P10.23·(Grp)0.625·( )], KW · H / T (8-12)
(3) use D × L is 305 × For 305 mm ball mill, the ball grindability coefficient is measured, that is, the weight of material with particle size below P1 newly generated in each revolution of ball mill, and the ball milling work index WIB is calculated by the following formula:
WIB = 44.45 / &# 91 P1)0.23·(Gbp)0.82]
·, kW · H / T (8-13)
the work index measured in the above laboratory is called laboratory work index. The work index calculated by formula (8-12) is consistent with that of open circuit wet closed circuit grinding of overflow rod mill with inner diameter of 2.4m (8 feet). If the working conditions of the mill are different, the work index calculated should be corrected< The operation work index of grinding machine can be calculated according to the data of the factory:
wi = w / (8-14)
IV. review of power consumption theory
the above three theories all explain a certain stage of crushing process from a certain angle. The area theory only pays attention to the energy needed for the new surface area, but ignores the deformation before the material is broken and the material is heterogeneous in practice. The volume theory only considers the deformation energy at the time of crushing, but does not consider the increase of new surface area, which is also one-sided. The fracture theory is between the area theory and the volume theory. It is proposed that the crushing power consumption is proportional to D5 / 2, but there is no sufficient theoretical basis. Because it is an empirical formula based on the actual data, it has a certain scope of application. According to the experimental study, it is proved that the new surface area is not much in coarse crushing, the volume theory is accurate, and the fracture theory is unreliable; When it is finely broken (broken to 10 μ The data obtained by the fracture theory is too small, and the new surface area increases, and the surface energy is the main one, so the area theory is more accurate. In a wide range between coarse crushing and fine crushing, the fracture theory is more applicable. Because the empirical formula is based on the general crushing equipment, it is roughly consistent with it in the case of medium crushing ratio. The error between each theory and the actual situation is not big in the range of suitable particle size, so it should be correctly selected in application. Among them, the fracture theory has practical significance and application value. Because K1 and K2 in the formula of area theory and volume theory respectively represent the separation work and deformation work required by the deformation of unit surface area and unit volume, which can not be determined at present, the application of these two formulas is limited, so they can only eliminate the proportion coefficient and make some relative calculation and analysis under the condition of the same mineral properties, so as to qualitatively explain some problems. The fracture theory uses the net power consumption of crushing and grinding, and all items in the formula can be measured, so it has a wide range of practical value. The Bangde formula can be applied to the following aspects:
(1) when the work index W is measured, the crushing power consumption of various particle sizes can be calculated
(2) used to select crushing or grinding machinery. By measuring the work index wi of ore, the required power under design conditions can be calculated, and the crushing machine can be selected from the capacity of required power< (3) it can be used to compare the working efficiency of different crushing equipment. If the power consumed by two crushers is the same, but the proct grains are different, the operation work index can be calculated respectively to see which crusher has high efficiency---- Shanghai jiapurui Machinery Technology Co., Ltd
it is assumed that the power consumption of crushing an ore is da ˊ= R1 · DS
where R1 -- proportional coefficient (work required to generate a unit new surface), also known as specific surface energy
if D is the diameter of the ore block, K1 and K2 are the shape coefficients of the surface proct and volume calculated by the diameter, then K1d2 and k2d2 are the surface area and volume respectively. δ Is the weight of ore per unit volume, then the ore with weight Q contains the number of ore blocks with diameter n = Q/ δ K2d3), so the work required for crushing d from ore to D is
A1 =
= (8-7a)
or (8-7b)
in the formula, when D is fixed, the power consumption is proportional to the crushing ratio minus 1; when I is fixed, the power consumption A1 is inversely proportional to the raw material particle size D< Second, the volume theory was independently put forward by Russian scholar Kirchhoff and German scholar Kirk. According to the volume theory, when the material is broken, the function of the external force on the material is to deform the material. When the deformation reaches the limit, the material is broken. And the stored deformation energy of the material is directly proportional to the volume. It is considered that the power consumption A2 of the crusher is related to the volume deformation of the material Δ If the scale coefficient is K2, then A2 = K2 Δ V
according to the derivation method of area theory formula, the power consumption formula of volume theory can also be deced as follows:
A2 = 2.303k2qlgi (8-8)
where K2 is the comprehensive proportion coefficient (, where R2 is the work required to crush the material per unit volume)< It can be seen from the equation (8-8) that the power consumption of crushing unit weight material A2 is proportional to the logarithm of crushing ratio I< In 1952, F.C. bond put forward a formula to calculate crushing power consumption, which is in the original form of
(8-9)
where W is the work consumed to crush a short ton (907.175kg) of material with a feed size of F to a particle size of P, kW · H / short t
F and P -- the square mesh width through which 80% of the feed and discharge can pass, respectively, μ m
wi -- work index; KW · H / short t
wi is an infinite particle size in theory, 80% of which can pass through 100% μ M mesh width (or 65% can pass 200 mesh mesh mesh width), which to a certain extent represents the degree of difficulty of material crushing, i.e. crushing or grindability
after establishing the above empirical formula, and then looking for a theoretical explanation, Bangde explained that: when crushing materials, the work done by the external force first deforms the object, and when the deformation exceeds the limit, cracks will be generated. After the cracks are formed, the deformation stored in the object can promote the crack expansion and generate cross-section. The useful part of the input work transforms into the surface energy on the new surface, and the other part becomes the heat loss. Therefore, the work required for crushing should be considered in terms of deformation energy and surface energy. The deformation energy is proportional to the volume, and the surface energy is proportional to the surface area. Assuming that the two terms are considered equally, the work required should be proportional to their geometric mean, that is, to. For an object of unit volume, it is proportional to
according to Bangde's explanation, the power consumption A3 required for crushing the mineral with weight of Q from D to D is
(8-10)
where K3 -- comprehensive proportion coefficient
among the above three theories, the Bangde fracture theory has great application value. The key in application is to measure the work index wi, which has more than one measurement and calculation method. Bonde proposed several methods to calculate the work index by measuring the fragility and grindability of ores in the laboratory:
(1) using the special double penlum impact tester designed by Bonde to measure the impact crushing strength of ores, and then measure the true density of ores, The crushing work index of ore is calculated by the following formula:
wi = 2.59c/sg (* - 11)
(2) d is used × L is 305 × The grindability coefficient (GRP (g) of 610 Bangde rod mill is measured for the newly generated material below P1 in each revolution; The particle sizes of F80 and p80 (both below 80% of the test mesh) in the ore and proct were determined μ m) The work index wt of ball mill is calculated as follows:
wick = 62 / &# 91 P10.23·(Grp)0.625·( )], KW · H / T (8-12)
(3) use D × L is 305 × For 305 mm ball mill, the ball grindability coefficient is measured, that is, the weight of material with particle size below P1 newly generated in each revolution of ball mill, and the ball milling work index WIB is calculated by the following formula:
WIB = 44.45 / &# 91 P1)0.23·(Gbp)0.82]
·, kW · H / T (8-13)
the work index measured in the above laboratory is called laboratory work index. The work index calculated by formula (8-12) is consistent with that of open circuit wet closed circuit grinding of overflow rod mill with inner diameter of 2.4m (8 feet). If the working conditions of the mill are different, the work index calculated should be corrected< The operation work index of grinding machine can be calculated according to the data of the factory:
wi = w / (8-14)
IV. review of power consumption theory
the above three theories all explain a certain stage of crushing process from a certain angle. The area theory only pays attention to the energy needed for the new surface area, but ignores the deformation before the material is broken and the material is heterogeneous in practice. The volume theory only considers the deformation energy at the time of crushing, but does not consider the increase of new surface area, which is also one-sided. The fracture theory is between the area theory and the volume theory. It is proposed that the crushing power consumption is proportional to D5 / 2, but there is no sufficient theoretical basis. Because it is an empirical formula based on the actual data, it has a certain scope of application. According to the experimental study, it is proved that the new surface area is not much in coarse crushing, the volume theory is accurate, and the fracture theory is unreliable; When it is finely broken (broken to 10 μ The data obtained by the fracture theory is too small, and the new surface area increases, and the surface energy is the main one, so the area theory is more accurate. In a wide range between coarse crushing and fine crushing, the fracture theory is more applicable. Because the empirical formula is based on the general crushing equipment, it is roughly consistent with it in the case of medium crushing ratio. The error between each theory and the actual situation is not big in the range of suitable particle size, so it should be correctly selected in application. Among them, the fracture theory has practical significance and application value. Because K1 and K2 in the formula of area theory and volume theory respectively represent the separation work and deformation work required by the deformation of unit surface area and unit volume, which can not be determined at present, the application of these two formulas is limited, so they can only eliminate the proportion coefficient and make some relative calculation and analysis under the condition of the same mineral properties, so as to qualitatively explain some problems. The fracture theory uses the net power consumption of crushing and grinding, and all items in the formula can be measured, so it has a wide range of practical value. The Bangde formula can be applied to the following aspects:
(1) when the work index W is measured, the crushing power consumption of various particle sizes can be calculated
(2) used to select crushing or grinding machinery. By measuring the work index wi of ore, the required power under design conditions can be calculated, and the crushing machine can be selected from the capacity of required power< (3) it can be used to compare the working efficiency of different crushing equipment. If the power consumed by two crushers is the same, but the proct grains are different, the operation work index can be calculated respectively to see which crusher has high efficiency---- Shanghai jiapurui Machinery Technology Co., Ltd
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