铊离子强化金精矿氰化浸出的研究

通过对混合电位模型的研究, 提出了铊离子对金氰化溶解只有在辅以阴极强化的条件下才具有显著强化作用的观点。以某硫化物金精矿为对象进行的强化氰化浸出试验表明, 不加入辅助氧化剂时, 铊离子对氰化浸金的强化作用并不显著;加入H₂O₂作为辅助氧化剂时, 取得了显著提高金浸出率的效果。对于常规氰化浸出48 h 只有54.89 %金浸出率的金精矿, 采用铊离子和H₂O₂ 协同强化时, 经过一段4 h 、二段12 h 总共16 h 的两段浸出, 即可达到92%以上的金浸出率。

Investigation on Enhancement of Cyanide Leaching of Gold Concentrate by Thallium Ions

By model study of mixed potential, a viewpoint is put forward that thallium ions have obvious enhancing effect on cyanide dissolution of gold only when they are associated with cathodic enhancement. A test is made for intensifying cyanide leaching of gold concentrate of a certain sulphide ore. The results show that thallium ions have not obvious enhancing effect on cyanide leaching of gold without auxiliary oxidant. Only by adding H 2O 2 as auxiliary oxidant, a dramatic increase in leaching ratio of gold can be achieved. Gold concentrate is obtained by conventional cyanide leaching for 48 h, with a leach ratio of 54.89%. However, by using H 2O 2 to assist thallium in enhancement of cyanide leaching, a leach ratio of above 92% can be obtained in two-stage leaching(i e, the first stage for 4 h and the second stage for 12 h, totalling 16 h) of the gold concentrate.