紫金山金铜矿生物提铜尾废资源再生初步研究

紫金山低品位次生硫化铜矿采用绿色、高效、低碳的生物提铜工艺，年产阴极铜规模2万吨。矿石中高硫铜比使得生物浸出过程可以自发进行，除水外无需补酸和添加任何药剂。每吨矿石的净产酸量约为3 kg,造成生物浸出过程酸铁过剩，需要开路，且喷淋周期从经济性上受到制约，一般不超过200天。喷淋周期结束后，浸出旧堆不出渣，原位封堆绿化，但酸性环境下生态修复难度大且成本高。研究了过剩酸铁溶液对完成浸铜周期老堆的浸出行为，并初步研究了该类尾废的资源利用方向。

Preliminary Study on Regeneration of Bioleaching Copper Tailings from Zijinshan Gold and Copper Mine

Zijinshan low-grade secondary sulfide copper mine adopts green, high efficiency and low carbon biological copper extraction process, with an annual output of 20 kt of cathode copper. The high sulfur copper ratio in the ore allows the bioleaching process to occur spontaneously without the need for acid supplement and any additives other than water. The net acid production per ton of ore is about 3 kg, resulting in excess acid iron in bioleaching process, need to open circuit, and the spray cycle is economically restricted, generally not more than 200 days. After the end of the spray cycle, the old dump is not removed and been sealed in situ for greening. However, ecological restoration is difficult and costly in acidic environment. The leaching behavior of excess iron and acid solution on the old dump after copper leaching cycle was studied, and the resource utilization direction of the waste was preliminarily studied.