国外某铜钴尾矿综合回收铜钴试验研究

Experimental Study on Comprehensive Recovery of Copper and Cobalt from a Copper and Cobalt Tailings Abroad

国外某陈年铜钴矿尾矿Cu品位为0.97%、Co品位为0.080%,铜主要以氧化铜的形式存在,占总铜的88.66%;-0.074 mm占77.31%、-0.038 mm占53.01%,Cu、Co在+0.15 mm粒级有明显的富集现象,但由于+0.15 mm粒级产率较低,导致该粒级Cu、Co分布率不高。为确定适宜的铜、钴回收工艺,进行了铜、钴浮选预富集,预富集粗精矿常温硫酸酸浸试验。结果表明,铜钴粗精矿Cu品位为5.37%、Co品位为0.325%、Cu回收率为63.99%、Co回收率为48.88%,酸浸酸耗为7.53 t/t、铜浸出率为80.16%、钴浸出率为69.87%。预富集效果良好,且预富集再酸浸比直接酸浸大大降低了酸耗,经济与环境效益显著。

In an aged copper and cobalt mine tailings abroad,the grade of Cu and Co are 0.97%and 0.080%,respectively.The copper mainly exists in the form of copper oxide,accounting for 88.66%of the to⁃tal copper.For the ores,-0.074 mm particles accounted for 77.31%and-0.038 mm particles accounted for 53.01%.And Cu and Co obviously enriched in the fraction of+0.15 mm.However,the distribution rate of Cu and Co was not high in the fraction due to its low yield.In order to determine the appropriate recovery process of copper and cobalt from the tailings,preconcentration of copper and cobalt by flotation was car⁃ried out,and then the roughing concentrate was leached in sulfuric acid at room temperature.The flotation results showed that the roughing concentrate is with Cu grade of 5.37%,Co grade of 0.325%,Cu recovery rate of 63.99%and Co recovery rate of 48.88%.The acid consumption in acid leaching is 7.53 t/t,and Cu and Co leaching rates of the rough concentrate were 80.16%and 69.87%,which indicating the better pre⁃concentration effect.The acid comsumption in acid leaching after preconcentration decreased compared with direct acid leaching,which had remarkable economic and environmental benefits.