一前言八茎选矿厂作为铜铁选矿厂,从1958年10月的200吨/日试验厂开始,处理规模逐渐扩大,1968年达2000吨/日。其间于1961年间开始白钨的选矿(称作1号钨系统),生产了钨精矿(天然白钨)。又从1963年间开始,设置了回收尾矿中微量白钨的设备(称作2号钨系统),用浮选和化学处理法开始了精制钨精矿(人造白钨)的生产。关于回收尾矿中白钨的细节,曾在日本矿业会志发表。另一方面,对于水泥原料的石灰石,为了提高其销售价值,从1973年间开始设置了生 A foreword Bazhang concentrator as a copper and iron concentrator, from the October 1958 200 t / day pilot plant began to gradually expand the scale of processing, 1968 up to 2,000 tons / day. During 1961, scheelite beneficiation (called No. 1 tungsten system) was started, producing tungsten concentrate (natural scheelite). Starting from 1963, a facility was set up to recover trace amounts of white tungsten in the tailings, called the No. 2 tungsten system, and the production of refined tungsten concentrates (man-made scheelite) was started with flotation and chemical treatment. The details on the recovery of scheelite in the tailings have been published in the Japan Mining Association. On the other hand, limestone for cement raw materials, in order to increase its sales value, has been established since 1973