(1) Conventional grinding process (three sections, one closed circuit crushing + ball milling). Its main features are complicated process, large floor space, large capital investment and small processing capacity; however, it has good adaptability and is less affected by changes in ore properties. (2) SABC process (semi-self-grinding + ball milling + hard stone crushing). The Dexing Copper Mine and the Wunuuge Tushan Copper- Molybdenum Mine Concentrator have a good application effect. The SABC process eliminates the two-stage crushing and screening process, reduces equipment investment, reduces the labor intensity of the operators, and reduces the amount of crushing process. Dust pollution. (3) HPGR grinding process (high pressure roller grinding). The use of a high-pressure roller mill instead of a fine- crush cone crusher produces more microcracks on the surface of the crushed product, reducing the energy consumption of the entire grinding system. Hu Genhua conducted a study on a natural copper sulphide ore in Australia. It was found that the high-pressure roller mill uses a combination of a circular washing machine + a cylinder screen and a vibrating screen to greatly improve the classification efficiency. The application of automatic control technology in the beneficiation production process has become more and more extensive. The Anqing Copper Mine solves the problem that the efficiency of the mill stage and the graded overflow fineness can not meet the specified requirements through automatic control. Hubei Sanxin Gold Copper Company through its grinding system be automated, stable production process of beneficiation process, improve the efficiency of grinding and classification and sorting index. Hu Ping uses PLC (Programmable Logic Controller) as the controller of the Dexing Copper Mine Grinding Classification Control System, which reduces the number of equipment failures when the equipment is down, reducing the labor intensity of workers and improving production efficiency. Through on-the-spot practice, the majority of technicians have improved many problems in the process of crushing and sieving and grinding and grading of copper ore dressing. Dexing Copper Mine replaced the single-layer shaft eccentric self-centering vibrating screen by adopting high-efficiency unit combined vibrating screen, which solved the problems of serious wear of the vibrating screen of the concentrator, oil leakage and oil smashing of the vibrator, and low production efficiency. Fang Zhijian passed the modification of the end cap lining part of Dashanchang semi- autogenous mill , the change of the feeding end cap lining, the improvement of the simplified lining, the modification of the semi-autogenous grinding machine and the oil seal of the pinion bearing housing of the ball mill . It has improved the operating rate of the semi-automatic mill of Dashan Plant and provided guarantee for the stable production of the concentrator. Under the condition that the crushed ore maintains the status quo, the Fenghuangshan Copper Mine has stopped by the gravel mill-rod system, increased the diameter of the ball mill ball, increased the comprehensive filling rate of the ball and accelerated the speed, which doubled the processing capacity of the concentrator. The electricity consumption for grinding is reduced to 7kW·h/t below 20kW·h/t. Ren Zhuanglin added pre- screening equipment before grinding, improved the processing capacity of the mill, improved the classification effect of the cyclone, and reduced the over-grinding phenomenon of the ore. Luo Shijun improved the particle size composition of a flotation and ore by hydrocyclone series grading, solved the problem of large fluctuation of copper recovery rate in Zhangzhou Concentrator, and improved and stabilized the technical and economic indicators of mineral processing . Ren Zhuanglin appropriately added steel balls to a copper mine in Xinjiang to increase the concentration of grinding, thereby increasing the treatment volume; replacing the single spiral classifier with a cyclone, and increasing the classification efficiency by increasing the pre- classification equipment . Liu Hengbai adopts a new type of cyclone that regulates the spatial pre-arrangement of feed particles and adjusts the size of the grading space to improve the classification efficiency. The Wushan copper mine uses a self-grinding machine to throw the ball screen and the cyclone in series to solve the pumping and blockage transportation in the grinding classification. Pipes and cyclones have problems such as graded overflow and rough running.
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Current status and progress of copper ore crushing and sieving and grinding grading technology
Beneficiation plant crushing grinding stage in energy consumption typically represents over 50% of the whole beneficiation process, as much as possible in order to reduce production costs, improve economic efficiency, concentrator always insisted on breaking ground phase "more crushing less grinding to pieces instead of grinding" the rules. At present, the common copper ore dressing crushing and grinding process in China is as follows: