论文部分内容阅读
采用直接氰化浸出、氨预处理及氨氰浸出等方法处理含硫化铜的金矿。研究这些浸出体系中金和铜的溶解行为。当NaCN含量小于5g/L时,金的氰化浸出受到所含硫化铜的严重干扰,这与组分平衡计算结果一致。氨预处理可以消除铜的干扰,在后续的氰化浸出过程中,即使在剂量较小的情况下,金也可以获得较高的提取率。采用Box-Behnken试验设计研究了氨氰体系中NH3、NaCN和Pb(NO3)2的主要影响以及其相互作用。其中NH3和NaCN浓度是影响金提取率的主要因素,而Pb(NO3)2的影响有限。增加NH3的浓度可以提高金提取的选择性和提取率,同时降低氰化物的用量。统计研究结果表明试剂间的相互作用对金提取无重大影响。氨预处理和氨氰浸出法在含硫化铜的金矿的处理中具有广阔的应用前景。
Direct copper cyanide leaching, ammonia pretreatment and ammonia leaching methods such as copper sulfide-bearing gold. The dissolution behavior of gold and copper in these leaching systems was investigated. When the content of NaCN is less than 5g / L, the cyanide leaching of gold is seriously disturbed by the copper sulfide contained, which is consistent with the calculation of component balance. Ammonia pretreatment can eliminate copper interference, and in the subsequent cyanidation leaching process, gold can obtain higher extraction rate even in small dosage. The main effects of NH3, NaCN and Pb (NO3) 2 in ammonia-cyanide system and their interaction were studied by Box-Behnken design. The concentration of NH3 and NaCN is the main factor affecting the gold extraction rate, but the effect of Pb (NO3) 2 is limited. Increasing the concentration of NH3 can improve the selectivity and extraction rate of gold extraction while reducing the amount of cyanide used. Statistical results show that the interaction between reagents has no significant effect on gold extraction. Ammonia pretreatment and ammonia cyanide leaching method in copper sulfide-bearing gold processing has broad application prospects.