Grinding equipment widely used in mineral processing plant is ball mill and rod mill. In ball mills, only lattice type and overflow type are currently used. Cone ball mills are not manufactured because of their low productivity, but some old concentrators still use them. The specifications of the ball mill and the rod mill are expressed by the simplified inner diameter D and the barrel length L. 1. Lattice ball mill The structure of various specifications sub-type ball mills is basically the same. The cylinder of the ball mill is rolled and welded with a steel plate with a thickness of about 18 to 36 mm. The two ends of the ball mill are welded with a flange made of cast steel, and the cylinder body is provided with a lining plate. with manganese steel, made of chrome steel, cast iron or the like wear-resistant rubber material, wherein the wide application of high manganese steel, rubber is still in the trial stage. The lining is about 50-130 mm thick and has a gap of 10-14 mm from the shell. It is paved with plywood, asbestos mat, or plastic pole or rubber to slow the impact of the steel ball on the simplified body. 2, overflow ball mill The overflow ball mill overflows by the mine itself by the lower edge of the hollow shaft because it does not need to install a heavy grid plate. Further, in order to prevent the small balls and the coarse ore nuggets in the ball mill from being discharged together with the slurry, the inner surface of the hollow journal bush is provided with a reverse spiral blade. 3, rod mill At present, the rod mill used in the concentrator has only two types of overflow type and open type. The former is more commonly used, and the latter has been stopped. The structure of the rod mill is approximately the same as that of the overflow type ball mill. The grinding medium used is a long round bar. 4, centrifugal mill Centrifugal mill is a new type of high-efficiency and ultra-fine equipment. It is divided into vertical and horizontal. According to the number of tubes, the former can be divided into single-tube and three-tube (planetary) centrifugal mills. 5, vibration grinding machine The vibration mill works at high frequencies, and the high-frequency vibration easily causes cracks in the material, and can generate a relatively high stress concentration in the crack, so it can effectively perform ultra-fine grinding. However, such mechanical springs are prone to fatigue and damage, the lining plate consumption is also large, the amplitude used is small, the ore is not too thick, and it is required to be evenly added, so it is generally suitable for grinding materials of 1 to 2 mm to 85~. 5 microns (dry mill) or 5 to 0.1 microns (wet mill). . 6, jet grinding machine Jet mill is a new type of dry grinding equipment that combines fine grinding of materials with grading and drying. Mainly used in the chemical and building materials industries, but recently there is a trend for grinding. The operation of the jet mill is: using high temperature compressed air, or superheated steam, or other preheated gas as the medium. Compared with the ball mill and the gravel mill, the concentrate grade of the jet mill product containing iron-bearing quartzite is about 2 to 3% higher than that of the ball mill and the gravel mill, and the iron recovery rate is about 2 to 15% higher. 7, spiral classifier The spiral classifier is a device matched with a wet ball mill and a ball mill to complete the grinding and grading. The specifications are expressed by diameter, and can be classified into a single spiral classifier and a double spiral classifier according to the number of spirals. According to the level of the liquid separation surface, it can be divided into high-grade, immersed and low-lying. 8, hydrocyclone The upper part of the hydrocyclone has a cylindrical shape, and the lower part has a conical shape. The center of the cylinder is inserted into an overflow pipe, and the outer side of the upper part has a feed pipe which is tangential to the outside. The hydrocyclone has been applied for many years in China's concentrator, mainly for fine fractionation, slurry concentration, dewatering and dewatering.
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