基于生物浸提技术的钴白合金中铜和钴的浸出效果及浸出机理

钴白合金是铜钴矿深加工过程中的副产物,其中的钴、铜等金属资源具有较高的回收价值.利用3种混合菌体系(At、Af、Lf)浸提钴白合金中的铜和钴,考察了在不同固液比下非接触和接触浸提铜和钴的浸出率并对其浸出机理进行了探究.在非接触浸出1％固液比下,钴的浸出率为100％,浸出浓度为1 356.14mg·L-1,铜的浸出率为7...

Bioleaching process and mechanism of Cu and Co in cobalt white alloy

The three mixed bacterial systems of At, Af and Lf were used to extract copper and cobalt from cobalt white alloy in a non-ferrous metal plant in Henan to investigate the leaching rate and leaching mechanism of copper and cobalt under different contact conditions of non-contact leaching and contact leaching with different solid-liquid ratios. The results showed that under the non-contact leaching with 1% solid-liquid ratio, 100% Co was leached and 77.42% Cu was leached, and their leaching mass concentration were 1356.14 and 837.19 mg·L−1, respectively. After 10 cycles of leaching, the concentrations of copper and cobalt in the final leaching solution were 7 358.67 mg·L−1 and 12 877.25 mg·L−1. After 5 days of contact leaching with 4% solid-liquid ratio, 100% cobalt was leached, while copper basically remained in the residue, which can provide a reference for the stepwise leaching of cobalt white alloy. Comparing the occurrence of copper and cobalt in the leaching residue of the contact leaching and non-contact leaching experiments in biological leaching, it is determined that the leaching of cobalt in cobalt white alloy is the direct effect of biological acid, and the leaching mechanism of copper is the common combination of biological acid and Fe3+ effect. In the leaching system with the participation of bacteria, there is a cycle in which copper leaching consumes Fe3+ and converts Fe3+ into Fe2+ and bacteria convert Fe2+ into Fe3+. The use of biological leaching cycle enrichment technology provides a reference for the efficient recovery of copper and cobalt in cobalt white alloy.