2015-10-28 grinding mill machine Views:438
High efficiency grinding balls for mining should be ground ore particles to the monomer once separated quickly discharged from the grinding machine. Thus one can avoid excessive wear, on the other hand can make the grinding media (such as balls) is fully act on the coarse ore particles can maximize the energy to do useful work. How to improve the efficiency of the mill itself except with quality related, human controllable factors can not be ignored. Human controllable factors include how to design grinding process, how to use the grinding mill machine, how to operate the mill, ball large number and so on.
Reasonable grinding process should be ground ore particles to the monomer once separated should be quickly discharged from the grinding machine. Thus can avoid excessive wear, on the other hand can make the grinding media (such as balls) is fully act on the coarse ore particles can maximize the energy to do useful work.But to be material particle size classification is very difficult within the existing grinding mill machines, for use grinding balls for mining will grind minerals or fine sieve size fractions separated qualified, and then return to the mill coarse grinding machine (also known as the return sand ). Visible in the closed-circuit grinding, grinding balls for mining to mine new ore plus return sand, so the material through the mill more material through the grinding mill machine speed is faster. In closed-circuit grinding, coarse repeatedly failed to force through the mill until the ground to pass up. Secondly, when the closed-circuit grinding, since a lot of grit to enter, so that the grinding mill machine to feed coarse fraction content increases. According to the principle of grinding dynamics. In this case the maximum energy for useful work, so grinding speed, mill productivity. In addition, since the presence of an appropriate amount of sand return, and can eliminate the new mill and mine to fluctuations impact on product particle size.
Therefore, the closed-circuit grinding can effectively avoid over crushed and "running rough" phenomenon. It enables grinding jobs in size to ensure that qualified under the premise to obtain a narrower level of product uniformity and coarse, which is the next step in the sorting operation is advantageous.
Practice has proved that the surrounding nesting rod mill can be reduced over crushed. Especially for brittle mineral more meaningful. Since these mill discharge mine faster, submerged in the bottom of the pulp density of mineral particles easily discharged, rod mill is also a result of long steel bars parallel as grinding media, it is possible to reduce the over-crush phenomenon. Further, since the surface of these pulp mill shallow. Pulp grinding media buffering effect is small. So that grinding media can fully play the role of broken, so the production capacity of these large grinding machine.
Grading equipment in the choice on the use of a fine sieve and mill closed, or pre-classification has some advantages. With a fine sieve for grading device. Capable of more stringent control mill product size, so that the particle size can not drain away, effectively avoid "running rough" phenomenon. Followed by high sieve screening efficiency, about 80-90%, while the spiral classifier and rake grader grading usually only 40-60% efficiency. This is likely to cause the fine fraction has been re-qualified into the mill, produced a crushing phenomenon.
Controllable factors grinding machine In this first explain the grinding process and grinding mill machine for use with impact on technical efficiency, technical efficiency in a subsequent article will focus on explaining how to operate the daily number of balls and mill Impact.
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