【摘要】 通过分析铊、铋、汞和铅等重金属强化金氰化溶解的电化学原理,对含金氧化物矿石和难浸硫化物金精矿进行了重金属强化浸金研究。结果表明:重金属对金氰化溶解的阳极过程有显著的强化作用,但在常规供氧条件下,金的溶解速率并未显著提高;只有同时采用阴极强化措施,才能使重金属起到显著提高金溶解速率的作用;对于含金氧化物矿石,单独采用重金属强化即可明显提高浸金速率,如果在过氧化氢助浸的基础上添加重金属,金的浸出速率会有更大幅度的提高;对硫化物金精矿而言,单独采用重金属无明显强化效果,只有在添加过氧化氢作为辅助氧化剂的基础上,重金属对金的浸出才能起到强化的作用,该体系中过氧化氢起到了强化阴极过程和氧化硫化物的双重作用。更多还原

【Abstract】 The applications of heavy metals, such as thallium, bismuth, mercury and lead, to enhancement of cyanide leaching for gold occurring in an oxides ore and a sulfides concentrate, were studied on the basis of electrochemical investigation. The results indicate that these heavy metals greatly intensify the anodic process of gold cyanidation. However, under the conventional oxygen supplying condition, the gold dissolution rate does not observably increase, if the cathodic process was intensified at the same time, the heavy metals will improve the dissolution rate of gold markedly. During leaching of gold from an oxides ore, only adding heavy metals, gold leaching rate increases apparently, when they are associated with hydrogen peroxide, gold leaching rate will further increase. To sulfide gold concentrates, the heavy metlas show remarkable enhancing effect on gold leaching only when they were used in combination with hydrogen peroxide, which not only promots cathodic process of gold dissolution but also oxidizes sulfides that are apt to to be oxidized.更多还原