水钴矿湿法冶金废渣抑制钴、钒浸出毒性工艺研究

以水钴矿湿法冶金废渣为研究对象,采取电化学辅助方法酸浸分离钴、钒并抑制其浸出毒性,考察了电辅助浸出时间、液固比、硫酸浓度、电流密度等因素对抑制废渣钴、钒浸出毒性的影响。结果表明:在浸出时间为120 min、硫酸浓度为600 mg/L、浸出液固比为10:1(mL/g)、电流密度为200 A/m ²条件下,经电化学辅助酸浸处理,水钴矿湿法冶金废渣的钴、钒、铜、锰、镍等重金属元素浸出毒性均明显降低;水平振荡法和硫酸硝酸法试验处理后的废渣钴浸出毒性分别降低99.1%和98.8%,钒浸出毒性分别降低91.7%和95.1%,较好实现了废渣浸出毒性的高效抑制和有价元素的分离回收。

Research on cobalt and vanadium leaching toxicity reduction of dumped sludge from heterogenite hydrometallurgy process

In order to reduced cobalt and vanadium leaching toxicity of dumped sludge in heterogenite hydrometallurgy process, the electric-assistant acid leaching process was investigated. The influence of the electric-assistant acid leaching time, liquid-solid ratio, sulfuric acid concentration and electric current density on decreasing leaching toxicity was studied intensively. The results shows that under the condition of electric-assistant leaching time 120 min, sulfuric acid concentration 600 mg/L, liquid-solid ratio 10:1(mL/g) and electric current density 200 A/m 2, the leaching toxicity of heavy metals such as cobalt, vanadium, copper, manganese and nickel has reduced obviously. After treatment by horizontal vibration method and sulphuric acid and nitric acid method, the cobalt leaching toxicity decreased by 99.1% and 98.8%, while the vanadium leaching toxicity decreased by 91.7% and 95.1% respectively. Therefore, the leaching toxicity of dumped sludge from heterogenite hydrometallurgy process was reduced efficiently, and the valuable elements were recovered and utilized successfully.