Gravity separation

重选在岩金矿山应用比较广泛，多作为辅助工艺，在磨矿回路中回收粗粒金，为浮选和氰化工艺创造有利条件，改善选矿指标，提高金的总回收率，对增加产量和降低成本发挥了积极的作用。山东省约有10多个选金厂采用了重选这一工艺，平均总回收率可提高2%～3%，企业经济效益好，据不完全统计，每年可得数百万元的利润。河南、湖南、内蒙古等省（区）亦取得好的效果，采用的主要设备有溜槽、摇床、跳汰机和短锥旋流器等。从我国多数黄金矿山来看，浮—重联合流程（浮选尾矿用重选）适于采用，今后应大力推广阶段磨矿阶段选别流程，提倡能收、早收的选矿原则。

Gravity concentration in rock gold mine is widely used, much as auxiliary process, recovery of coarse gold in grinding circuit, create favorable conditions for flotation and cyanidation process, improve the processing performance, improve the total recovery of gold, to increase the yield and played a positive role in reducing costs. There are more than 10 gold by gravity concentration of this technology in Shandong Province, the average recovery rate can be increased by 2% ~ 3%, good economic efficiency of enterprises, according to incomplete statistics, each year hundreds of million yuan of profit. Henan, Hunan, Inner Mongolia province (area) also achieved good results, with the main chute equipment, shaker, jig and short cone cyclone etc.. Most of the gold mines from our point of view, floating - combined process (flotation tailings by gravity) suitable for use, we should vigorously promote the stage grinding and stage classification process, this can be advocated, as early as the dressing principle.