我矿系含有铜、硫、钴、镍等多金属元素的矽卡岩型磁铁矿床。目前选矿车间处理的原矿是井下主矿体上部-50米的高硫磁铁矿石。自一九七一年投产以来,产量、质量距设计指标还有较大距离,特别是浮选段的硫回收率年历史最好水平仅有64.72%,远远达不到91.55%的设计指标。因此挖掘现有生产工艺的潜力,提高选矿回收率,对我矿来说具有十分重要的意义。一九七九年底我们进行了改变捕收剂加药点的工业生产试验。试验历时三个月,八○年元月份在原矿含硫品位3.34%的情况 Mine is a skarn-type magnetite deposit containing copper, sulfur, cobalt, nickel and other polymetallic elements. At present, the ore dressing shop is dealing with the ore-bearing high-sulfur magnetite ore -50 meters above the main orebody. Since its commissioning in 1971, the output and quality of the flotation section have still a long way to go from the design indexes. In particular, the annual best sulfur recovery rate of flotation section is only 64.72%, far less than the design index of 91.55% . Therefore, excavating the potential of the existing production process and increasing the recovery rate of mineral processing are of great significance to mine. In late 1979, we conducted industrial production tests to change the dosing point of collectors. Test lasted three months, January 1980 in the ore sulfur content of 3.34% of the situation