1、附二 On Improving the efficiency of ball mill grinding In the chemical industry, mineral processing operations, grinding machine is one of the main production equipment.According to different raw minerals to select best meet the technical requirements of the mill and the mill models.Select the mill ca
2、n produce equipment to take into account the difference between design and actual, the actual production to leave some spare capacity, so equipment does not cause overload in the production process, extended the life of mill.Certain minerals in the original material and choice of type of ball mill,
3、the ball is the grinding of one of the main parameters, the ball diameter is too large or too small are unfavorable, only suitable for crushing ore particle is required for precision grinding ball diameter required Kunming Power Engineering University, Professor DuanXixiang in 1989 derived the first
4、 formula of practical value Qiuban theoretical formula: Db=Kc0 5224 (2-6 )压 (10PeDo)dl 3(cm) Where:DbThe ball diameter required:cm KcCorrection factor for the combined experience, according to the value of ore particle size change； Transfer rate for the mill( %) 压 For the ball in the effective densi
5、ty of the pulp ,g/cm3 PeFor the mill in the middle of condensation layer diameter,cm D 95% of the sieve size to mine cm Accurate calculation of the diameter of steel ball can solve the single-level ore particle diameter required for the precise calculation of the ball, while the mill within the over
6、all accuracy depends on the load of additional global approach to solve, due to complexity of the problem, so do not have a ball successful, scientific, effective and easy-to promote the application of loading up the ball method.However according to sum up years of experience in the following import
7、ant reference factor: (1) radius of the theoretical formula with the ball accurately calculate the exact needs of ore particle diameter ball； (2) Based on actual production, measured against ore crushing strength； (3) screen Analysis of the mill to the mine, according to the size composition of the
8、ore with a broken guiding principles of statistical mechanics with the ball. Grinding concentration on grinding efficiency greatly, slurry concentration, its viscosity big, easy to adhesion of mineral particles in the medium, enhanced combat and crushing effect, pulp illiquid.Thus, according to the
9、actual production situation, the first paragraph of the concentration of coarse grinding of the pulp mill in the pulp out of the case to maximize the use of higher concentration, fine grinding lower concentration of the corresponding control can be achieved by good grinding effect.According to the c
10、oncentration of control, to control the grinding time, into the mine in the same capacity by the high concentration of the corresponding length of grinding time, pulp density low velocity, short grinding time, grinding effect of relatively difference.Sand-returning Ratioon the grinding productivity
11、has a direct impact, in certain circumstances. In the grade efficiency is the same, Sand-returning Ratioand grinding efficiency than proportional. According to the productivity of mill: Q=qVKgKpK1KeKd Where:q ,Productivity per unit volume for the mill, t hm3； v ,Effective volume for the mill, m3； Kg
12、,By grinding material and size of the correction factor to the material；checker mill,Ke,KI=1；Cyclic load factor for the mill；Kd,Correction factor for the mill diameter.Can be seen from the above formula to improve the effective capacity can mill up to improve mill productivity.Liner thick, heavy, an increase of power consumption, have reduced the effective cylinder volume, reducing the efficiency of the mill, so choose the right liner for improving the grinding efficiency and cost savings have a significant
