四川某胶磷矿石反—正浮选选磷试验

Experiments on Direct Flotation and Inverse Flotation of a Collophane Mine in Sichuan

四川某胶磷矿石镁、硅含量较高,磷矿物嵌布粒度较粗。采用反浮选—正浮选流程对该矿石进行了工艺技术条件研究,结果表明,矿石磨至-0.074mm占77%后,在弱酸性环境下以YC为捕收剂1次反浮选脱镁,弱碱性环境下以水玻璃和JXL-2组合为硅抑制剂、JXL-1为磷矿物捕收剂,1粗1扫正浮胶磷矿,最终可获得P2O5品位为36.10%、回收率为84.94%的磷精矿,精矿SiO2、MgO含量分别比原矿下降了4.13、4.52个百分点。

A collophane mine of Siehuan contains high contents of magnesium and silicon impurities, among which phosphorite is disseminated coarsely. The technical conditions of the ore were investigated by adopting the process of inverse flotation-direct flotation. The resuhs showed that under grinding fineness of -0. 074 mm 77% for the ore, phosphate con- centrate with P205 grade of 36.10% and recovery of 84.94% was obtained by the flow-sheet of one-stage inverse flotation for magnesium removal with YC as collector in acidic environment, and the process of one roughing ＋ one scavenging direct flotation of cellophane with combining water glass and JXL-2 as inhibitor, JXL-1 as collector of phosphate materials in weak alkaline conditions. The contents of SiO2 and MgO in the concentrate were decreased by 4.13% and 4.52% respectively compared with that in run-of-mine.