某难选低品位氧化铜矿石水热硫化浮选试验

某低品位氧化铜矿石氧化率和结合率都很高且风化严重，采用常规硫化钠硫化浮选工艺难以有效分选。为此采用水热硫化浮选工艺对其进行处理，即在高压釜内利用硫磺的歧化反应生成的二价硫将氧化铜矿物硫化成硫化铜矿物，然后对硫化产物按硫化铜矿石浮选工艺进行选别。试验结果表明：水热硫化过程的适宜工艺条件为反应温度200 ℃、反应时间180 min、物料粒度-0.074 mm占90%、硫磺用量为理论量的1.4倍、液固比1.4。在此条件下获得的的硫化产物经浮选，铜精矿品位和回收率分别达到15.73%和71.49%，比常规硫化钠硫化浮选时分别提高4.28和38.73个百分点。

Experimental Research on Water-Heating Sulphidizing Flotation Process of A Low-Grade Refractory Oxidized Copper Ore

A low-grade oxidized copper ore,with high oxidation ratio and high combination ratio and serious weathering,can not effectively been separated by the conventional sulphidizing flotation process.Therefore,water-heating sulphidization flotation process was adopted to deal with the oxidized copper ore.That is S-2 by disproportionation reaction of sulfur in autoclave,will transform oxidized copper ore into copper sulfide,and then the product,copper sulfide minerals,were separated by the conventional flotation process.Experimental results indicate that the optimal conditions for water-heating sulphidizing process are determined as follows: reaction temperature 200 ℃,reaction time 180 min,particle size 90%-0.074 mm,vulcanizing agent dosage 1.4 times to the theoretical dosage,liquid-solid ratio was 1.4.Compared with the conventional sulphidizing flotation with Na2S,the grade and recovery rate of copper concentrate obtained in these conditions were 15.73% and 71.49%,and increased by 4.28 and 38.73 percentage points,respectively.