一、概述当今,由于世界矿物资源日渐贫细杂,需入选的矿量越来越多,对精矿质量要求越来越高,磨细度越来越细,因而金属消耗也越来越大。据统计,美国和加拿大的选厂每年耗金属量超过45.4万吨;79年,我国各行业磨机磨介总耗量也多达42.65万吨 I. Overview Nowadays, as the world’s mineral resources become increasingly intricate and complicated, the amount of ore to be selected is more and more, the quality requirements of the concentrates are getting higher and higher, and the fineness is getting finer and the metal consumption is also getting larger and larger . According to statistics, the annual consumption of metals in the United States and Canada exceeds 454,000 tons. In 1979, the total consumption of mill grinding in various industries in China reached as much as 426,500 tons