论文部分内容阅读
利用自主选育的耐高砷中高温浸矿菌浸出以砷黝铜矿为主的高砷铜精矿(As 4%~5%,Cu>20%)。采用前期中温浸矿菌,后期高温浸矿菌的两段法生物浸出10 d,总铜浸出率可达90.01%。对浸渣的铜物相分析可知:高温菌对黄铜矿的浸出率可达78.45%,是中温浸矿菌14.2%的5.5倍以上;对砷黝铜矿的浸出率为33.42%,约为中温浸矿菌17.48%的2倍。对原生硫化铜矿的浸出率总计为50.24%,约为中温浸矿菌16.26%的3倍。高温菌对砷黝铜矿的氧化作用较黄铜矿差;中温浸矿菌对As3+和As5+的耐受力比高温菌强。在两段法浸出前期添加2.0 g/L的Fe3+或2.5%的黄铁矿精矿细菌培养液均能提高中温浸矿菌的浸出速率。
Arsenic tetrahedrite-based high-arsenic copper concentrates (As 4% ~ 5%, Cu> 20%) were leached by self-selected high-arsenic intermediate-temperature soaking bacteria. The leaching rate of the total copper reached 90.01% by using the two stages of bioleaching of medium-temperature soaking bacteria and later high-temperature soaking bacteria for 10 days. The leaching of copper phase analysis shows that: high temperature bacteria on chalcopyrite leaching rate of up to 78.45%, 14.2% of mid-temperature leaching bacteria more than 5.5 times; for the arsenic tetrahedrite leaching rate of 33.42%, about Middle temperature soaking bacteria 17.48% 2 times. The leaching rate of primary copper sulphide ore is 50.24%, which is about three times of that of 16.26% of mid-temperature leaching bacteria. The oxidative effect of high temperature bacteria on arsenite and tetrahedrite is worse than that of chalcopyrite. The tolerance of As3 + and As5 + in medium-temperature soaking bacteria is stronger than that in high temperature. Adding 2.0 g / L Fe3 + or 2.5% pyrite concentrate bacterial culture solution before the two-stage leaching can increase the leaching rate of mesophilic leachate.