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针对含硫砷铜矿的高砷铜精矿进行细菌浸出实验研究,考查不同矿浆浓度、不同初始Fe~(2+)浓度和温度对铜精矿细菌浸出的影响。细菌浸出可以促进铜矿物的溶解,尤其是促进硫砷铜矿的氧化分解。在矿浆浓度4.0%,初始Fe~(2+)浓度2.5 g·L~(-1),浸出温度45℃,无菌条件下浸出85 d,铜精矿中铜、砷的浸出率分别为26.4%,1.26%。同等条件下,细菌浸出铜精矿中铜、砷的浸出率分别达62%,14%,分别为无菌对照的2.35倍和11.00倍。矿浆浓度和初始Fe~(2+)浓度对铜精矿的浸出具有显著影响:高矿浆浓度下砷的浸出受到明显抑制;过高和过低的Fe~(2+)浓度不利于砷的浸出,初始Fe~(2+)浓度在10.0 g·L~(-1)时,铜、砷的浸出率最高分别可达77.9%,11.9%,此时体系铁浓度维持在较低水平。高砷铜精矿细菌浸出实验结果表明,铜、砷浸出行为存在差异:由于蓝辉铜矿快速溶解,浸出60 d时铜快速浸出,随后浸出速率下降。细菌浸出过程中,浸出初期砷浸出率低于2%,随浸出时间的延长砷浸出率逐渐升高,说明硫砷铜矿后于蓝辉铜矿、铜蓝浸出。提高温度对硫砷铜矿的浸出有显著的促进作用。
Bacterial leaching experiments were carried out on high-arsenic copper concentrates containing arsenic-bearing arsenic copper mine to investigate the effects of different pulp concentrations, different initial Fe 2+ concentrations and temperature on the bacterial leaching of copper concentrates. Bacterial leaching can promote the dissolution of copper minerals, especially the oxidation and decomposition of arsenopyrite. The leaching rates of copper and arsenic in copper concentrate were respectively 26.4% and 4.0% when the initial concentration of Fe 2+ was 2.5 g · L -1, the leaching temperature was 45 ℃ and the leaching time was 85 days under aseptic condition. %, 1.26%. Under the same conditions, the leaching rates of copper and arsenic in bacterial leaching copper concentrate were 62% and 14%, respectively, which were 2.35 times and 11.00 times respectively that of the sterile control. The pulp concentration and the initial concentration of Fe ~ (2+) have a significant effect on the leaching of copper concentrate: the leaching of arsenic is obviously inhibited under high pulp concentration; the high and low Fe ~ (2+) concentration is not conducive to the leaching of arsenic When the initial concentration of Fe 2+ was 10.0 g · L -1, the leaching rates of copper and arsenic reached 77.9% and 11.9%, respectively. At this time, the iron concentration in the system was kept at a low level. Bacterial leaching experiment results of high-arsenic copper concentrates showed that the leaching behavior of copper and arsenic was different. Because of the rapid dissolution of blue-chalcopyrite, the copper leached quickly after leaching for 60 days, and then the leaching rate decreased. During the process of bacterial leaching, the leaching rate of arsenic in the initial leaching period was less than 2%. The leaching rate of arsenic gradually increased with leaching time, indicating that the arsenic copper mine was leached in Langhui copper mine and copper blue. Increasing the temperature of arsenic copper mine leaching has a significant role in promoting.