引言以石英-萤石建造的萤石矿,构造比较简单,易得一般品级的萤石精矿。但欲得含二氧化硅低于0.5—0.8%的优质萤石精矿难度较大。衡南萤石矿即为一典型例子。由于萤石与石英的共生关系复杂,尤其是隐晶质石英的存在,使星散状、细脉浸染状及环形交代状萤石难以单体解离,在-200目粒级中隐晶质石英连生体高达17%,造成精矿降硅的极大困难。当精矿含氟化钙为98%左右时,含二氧化硅往往在1—2%左右。笔者 Introduction Fluorite mine, which is constructed of quartz-fluorite, is relatively simple in structure and easy to get fluorite concentrate of general grade. However, it is more difficult to obtain high-quality fluorite concentrate containing silica less than 0.5-0.8%. Hengnan fluorite mine is a typical example. Due to the complex symbiosis between fluorite and quartz, especially the presence of cryptocrystalline quartz, it is difficult to dissociate singularly, finely disseminated and annular interfacial fluorite, Even the body up to 17%, resulting in great difficulties in reducing the silicon concentrate. When the concentrate containing calcium fluoride is about 98%, containing silica is often around 1-2%. author