低品位氧化铅矿硫化浮选的影响因素研究

A study on influencing factors of sulfidation flotation of the low grade lead oxide ore

随着硫化铅矿资源的不断消耗,难处理氧化铅矿石已成为生产铅的重要来源。本文对产自缅甸的低品位氧化铅矿(Pb1.78%,氧化率为76.97%,铅矿物主要为白铅矿,少量铅矾和方铅矿)采用硫化-黄药浮选法,分析了硫化剂、捕收剂及抑制剂对氧化铅矿的作用机理,研究了磨矿细度、浮选药剂制度及流程等因素对浮选指标的影响。结果表明,采用1次粗选2次扫选和3次精选闭路流程,以硫化钠为硫化剂,水玻璃、六偏磷酸钠和羧甲基纤维素(CMC)为抑制剂,丁基黄药和羟肟酸为组合捕收剂,最终获得含Pb品位56.73%,Pb回收率82.83%的铅精矿。

The refractory lead oxide ore has become an important source of lead production with the continuous depletion of lead sulfide mineral resources.The low grade lead oxide ore from Myanmar has Pb grade of 1.78%and an oxidation rate of 76.97%,Consists of lead minerals including major cerusite and minor sardinianite and galena.In this paper,the sulfidation-xanthate flotation method was adopted to undertake flotation experiment of the ore,the mechanism of action of the sulphurizing agent,collectors,and inhibitors on the lead oxide ore was analyzed,and the influence of factors,including the grinding fineness,reagent types and dosage,and processing flow,etc.,on the flotation indexes have been studied through flotation tests.Based on the determined conditions,a closed circuit test with one stage rougher,second stage scavenger and third stage cleaner flotation was carried out to process the run-of-mine ore with a lead grade of 1.78%by adding the sulphurizing agent of sodium sulfide,inhibitors of sodium silicate,sodium hexametaphosphate,and carboxymethyl cellulose(CMC),and collectors of butylxanthan and hydroxamic acid,with the final obtained lead concentrate containg 56.73%Pb at a recovery rate of 82.83%.