关键词: 铜尾矿, 氨浸, 碱性细菌, 生物—化学联合浸出

Abstract: In view of low copper bioleaching rate of acclimatized alkaline bacteria on copper tailings, biochemical leaching tests by adding appropriate amount of ammonia are carried out, which are compared with the results of single chemical leaching tests to find out the right way for tailings leaching. The results show that in pure ammonia leaching test, copper leaching grows slowly with the ammonia increased to a higher concentration; In the combining leaching tests, a higher copper leaching rate of 35.57% can be achieved when the initial concentration of ammonia is 40g / L within about 30 d; The single alkaline bioleaching can reach maximum leaching rate of 24.51%; Under the same conditions, the leaching rate with single ammonia is only 11.98%; And the combining leaching rates are increased by 11.06% and 23.59% respectively. It can be seen that low concentration of ammonia can promote the bacteria leaching.

Key words: Copper tailings, Ammonia leaching, Alkaline bacteria, Biochemical leaching