云南某萤石与重晶石共生矿选矿试验研究

TEST STUDY ON FLOTATION OF A FLUORSPAR-BARITE ORE IN YUNNAN

以云南某萤石与重晶石共生矿为研究对象,该矿含萤石33.46%,重晶石52.73%,萤石与重晶石含量高。由于萤石与重晶石可浮性相近,分离难度大。为了综合开发利用该矿产资源,对该共生矿进行了选矿试验研究。试验采用了先混合浮选再分离浮选的工艺流程。混合浮选在磨矿细度-74μm占80%的条件下,调整p H值至9,以水玻璃为抑制剂、油酸钠为捕收剂将目的矿物先富集,在此过程中同时抛尾除杂,混合浮选所得精矿再进行分离浮选;分离浮选通过抑制重晶石浮选萤石实现,适宜的p H值为6,以水玻璃、硫酸铝、栲胶为抑制剂,以油酸钠为捕收剂,最终实现了萤石和重晶石的分离。通过全浮选闭路试验,得到品位为94.42%、回收率为87.77%的萤石精矿和品位为91.89%、回收率为88.66%的重晶石精矿。

This paper takes a fluorspar and barite ore in Yunnan as the research object. The ore contains 33.46% fluorspar and 52.73% barite. It is difficult to separate fluorspar and barite because of the similar float- ability. In order to utilize the mineral resources, a beneficiation process of bulk flotation followed by fluorspar-barite separation was adopted. The bulk flotation was carried out under the condition of grinding fineness 80%-passing 74μm and pulp pH = 9, using sodium silicate as inhibitor and sodium oleate as collector. The aim of the bulk flota- tion is pre-concentrating of the aimed minerals and discarding tailings. The fluorspar-barite separation is carried out by inhibiting barite and floating fluorspar under the condition of pulp pH = 6, using sodium silicate, aluminum sul- fate and tannin extract as inhibitor, and sodium oleate as collector. The locked-cycle flotation test obtained a fluo- rite concentrate grading 94.42% with a fluorite recovery of 87.77% , and a barite concentrate grading 91.89% with a barite recovery of 88.66%.