低品位含铜废石生物浸出试验研究

Study on the Low-grade Copper Waste Ore with Biological Leaching Process

内蒙古某低品位含铜废石平均含铜0.16%,其中原生硫化铜占79.38%,次生硫化铜占14.17%。采用生物柱浸-萃取-电积工艺进行铜回收试验研究。对浸出生物种群、矿石粒度、柱浸温度等条件进行试验研究,试验结果表明:在矿石粒度50 mm以下保持柱浸体系温度为40℃下,采用ZJ微生物菌种进行滴淋浸出185 d,浸出率可以达到27.34%。采用生物柱浸-萃取-电积工艺的综合回收率大于27.20%。浸出液经萃取-电积获得的阴极铜符合国家标准。

A low-grade copper bearing waste rock in Inner Mongolia contains 0.16% copper on average,among which primary copper sulfide and secondary copper sulfide are 79.38%, 14.17% respectively.Biological column leaching-extraction-electrodeposition process was used to recover copper. Experimental research on leaching population, ore granularity, column leaching temperature was carried on. The results showed that the copper leaching rate can reach 27.34% by using ZJ domesticated bacteria for leaching for185 days under optimized conditions as: particle size of the ore of 50 mm, leaching temperature of 40 ℃.And the comprehensive recovery rate of copper is more than 27.20% by using bioleaching-extractionelectrodeposition process. The cathode copper obtained by extraction electrodeposition from leaching solution coincidences the national standard of cathode copper.