矿产保护与利用Issue(1)：54-60,7.DOI:10.13779/j.cnki.issn1001-0076.2018.01.009
辽宁某低品位菱镁矿提质降杂试验研究与工业实践
The Experimental Research and Industrial Practice on Improving Quality and Reducing Impurities by Flotation from a Low Grade Magnesite Ore in Liaoning
摘要
Abstract
A magnesite ore treated in a mineral processing plant in Liaoning province belongs to low-grade ore bearing high silicon and calcium,and the reverse—direct flotation flowsheet was adopt-ed,but there was in a state of shutdown due to the poor technical and economic indexes caused by the problems existing in the original flowsheet such as poor liquidity and selectivity of collector froth,severe entrainment of useful mineral,unstable flowsheet operation and the difficulty in imple-mentation of closed-circuit production in the reverse flotation stage,poor effect of calcium removal in the direct flotation stage,big loss and low recovery of magnesite(only 35% of MgO recovery), etc. Based on the problems existing in the original flowsheet,it was proposed in this paper to treat the ore by the process of iso-flotability reverse—direct flotation, namely, iso-flotability reverse flotation with water glass as regulator and novel anionic collector BK-428 under condition of weak acidic pulp (pH 6.0) was adopted to remove silicate and dolomite,and direct flotation by sodium hexametaphosphate as regulator and cationic collector BK410B under condition of weak alkali pulp (pH 9.0) was used to further remove dolomite and silicate, and it could realize the quality im-provement and impurities reduction of low-grade magnesite ore. By this new process, based on the systematic laboratory tests and continuous pilot tests, the industrial tests were carried out and the magnesite concentrate with a MgO grade of 47.14% and a recovery rate of 76.02% was ob-tained from the low grade magnesite ore with MgO 42.94%, while SiO2and CaO content in con-centrate decreased from 4.14% and 2.91% to 0.28% and 0.53% respectively.关键词
低品位菱镁矿/含硅矿物/白云石/等可浮/反浮选/正浮选Key words
low-grade magnesite ore/silicate minerals/dolomite/iso-flotability/reverse flota-tion/direct flotation分类
矿业与冶金引用本文复制引用
谭欣,苏建芳,朱阳戈,郑桂兵,王中明..辽宁某低品位菱镁矿提质降杂试验研究与工业实践[J].矿产保护与利用,2018,(1):54-60,7.基金项目
国家高技术研究发展计划(863计划)项目(2011AA060101) （863计划）
