What Are The Main Factors Affecting Grinding Efficiency
The Influence Of Ore Properties
The composition and physical properties of ore have a great influence on the grinding technology efficiency, for example, when the useful minerals in the ore are coarse in size and loose and brittle in structure, they are easy to grind. When the size of the embedded fabric of useful minerals becomes finer, the structure is dense and the hardness is larger, it is difficult to grind. Generally speaking, coarse-grained grade is easier to produce qualified particle size, while fine grinding is difficult. Because with the decrease of particle size, the vulnerability of materials is also reduced, that is, it becomes more and more strong, so the speed of producing qualified particle size is slower. Therefore, the grinding technology efficiency of coarse grinding is higher than that of fine grinding.
Influence Of Equipment Factors
The equipment factors have certain influence on the grinding technology efficiency. For example, the overflow ball mill has a slow ore discharging speed, and the ore particles with high density are not easy to be discharged, and it is easy to produce over crushing phenomenon. In addition, the classifier with the grinder is closed circuit, which is easy to crush when the classification efficiency is low, so it will reduce the grinding technology efficiency.
The Influence Of Operation Factors
The operation factors must undoubtedly affect the grinding technology efficiency. For example, when the return ratio is too large and the normal passing capacity of the grinding machine is exceeded, the phenomenon of “running coarse” will appear in the grinding products. However, the return ratio is too small or there is no return sand, which is easy to cause the phenomenon of over crushing. If the load is too large, the phenomenon of “running rough” in grinding products is serious, while the load is insufficient, it is seriously crushed. Therefore, the feeding is uniform and stable when grinding. The increase of grinding technology efficiency will be affected by the large amount of ore feeding. The size of grinding in each section is not reasonable, and it also affects the grinding technology efficiency.
The Influence Of Grinding Concentration
Grinding concentration has a great influence on grinding technology efficiency. Because the grinding concentration directly affects grinding time, the concentration is too large, the material flow in the mill is slow, and the grinding time increases, and it is easy to over crush. In addition, the coarse particles in the high concentration pulp are not easy to sink, and they are easy to follow the slurry flow, resulting in “running coarse”. If the pulp concentration is too thin, the material flow rate will be accelerated. The grinding time is shortened, and the “running coarse” will appear. At the same time, the large density ore particles are easy to deposit in the bottom of the pulp, and will cause the phenomenon of over crushing. Therefore, the proper grinding concentration should be mastered in operation, which requires strict control of water consumption. Generally speaking, the concentration of coarse grinding is usually 75% – 85%, and the fine grinding concentration is 65% ~ 75%.