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文章研究了用盐酸一步法浸出氰化尾渣中金、铁、铅的工艺过程,结果表明,浸取反应优化工艺条件为:在沸腾状态下回流,盐酸起始浓度9.8 mol/L,盐酸过量系数1.6,反应时间1.5 h。此优化工艺条件下,金、铁、铅的浸出率分别为89.32%、93.45%、99.97%,浸出渣主要物相为硅化合物等,实现了有价金属与硅化合物的分离。从热力学角度分析了大量三价铁离子存在时,盐酸浸出金的可行性,而且,随着温度的升高,金的浸出率越高,因此,浸出反应在沸腾状态下进行回流。实验证明,一步法浸取氰化尾渣中金、铅、铁是可行有效的。
In this paper, the leaching process of gold, iron and lead in cyanidation tailings by one-step hydrochloric acid was studied. The results showed that the optimum conditions of leaching reaction were refluxing under boiling condition, the initial concentration of hydrochloric acid was 9.8 mol / L, Coefficient 1.6, reaction time 1.5 h. Under the optimum conditions, the leaching rates of gold, iron and lead were 89.32%, 93.45% and 99.97%, respectively. The main phases of leaching residue were silicon compounds, which achieved the separation of valuable metals and silicon compounds. From the viewpoint of thermodynamics, the feasibility of leaching gold with hydrochloric acid in the presence of a large amount of ferric ions was studied. And the leaching rate of gold increased with the increase of temperature, and the leaching reaction was refluxed in boiling state. Experiments show that one-step leaching of gold cyanide tailings, lead, iron is feasible and effective.