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黄茅山矿区砂矿中,含有大量的锰结核,其中含铅1～5%,含锰5～17%,是综合利用的原料。长期以来,由于没有回收这种锰结核,在磨矿作业中经磨细后大量流失于尾矿中。1965年,昆明冶金研究所进行了φ300毫米重介质旋流器回收锰结核试验工作。1968年,黄茅山选矿厂初步建成回收锰结核的生产车间。通过生产、科研和设计单位的共同努力改进,在1969年正式运用于生产。通过生产考察,当重介质旋流器锥角40°时,采用选厂中间产品次精矿复洗尾矿作介质,介质比重介于
Huangmaoshan mine sand, containing a large number of manganese nodules, including lead 1 ~ 5%, 5 ~ 17% manganese, is the comprehensive utilization of raw materials. For a long time, due to the lack of recovery of this manganese nodules, after grinding in the grinding operation, a large amount of loss in the tailings. In 1965, Kunming Institute of Metallurgy conducted a φ300 mm HM cyclone manganese recovery test work. In 1968, Huangmushan Concentrator initially built a workshop to recover manganese nodules. Through the joint efforts of production, research and design units to improve, in 1969 formally applied to the production. Through the production inspection, when the heavy medium cyclone cone angle of 40 °, the use of intermediate concentrates beneficiation plant secondary cleaning tailings as a medium, medium weight between