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研究了诸如硫代硫酸盐离子、铜(Ⅱ)、亚硫酸盐离子和氨等浸矿剂浓度对从多金属硫化物金精矿、含银黄铁矿中浸出金和银的影响。也试验了温度、搅拌速度和粒度对溶解金和银的影响。在优化条件下,对含Aulu6.26、Ag293.33g/t及Cu6.20、Pb0.46、S41.06%金精矿和含Au12.31、Ag1389.70g/t及Cu5.97、Pb4.38、S28.34%含银黄铁矿,金、银的浸出回收率分别为95757、86.99%和93.38、85.64%。试验结果表明,主要因素间的竞争作用至为重要。体系中铜的作用与其说是催化剂勿宁认为是能迅速再生的氧化剂。而且,在试验条件下Cu(Ⅱ)最佳浓度和硫代硫酸盐与铜的克分子比有关。已确定浸出过程由扩散控制。测得的金精矿和含银黄铁矿金溶解反应的表观活化能分别是2.96和2.84kcal/mol。
The effects of concentrations of leaching agents such as thiosulfate ions, copper (II), sulfite ions and ammonia on gold and silver leaching from polymetallic sulphide gold concentrates, silver-containing pyrite were studied. The effects of temperature, stirring rate and particle size on the dissolution of gold and silver were also tested. Under optimized conditions, the gold concentrate containing Aulu6.26, Ag293.33g / t and Cu6.20, Pb0.46, S41.06% and Au12.31, Ag1389.70g / t and Cu5.97, Pb4 were obtained. 38, S28.34% silver-bearing pyrite, gold, silver leaching recovery rates were 95,757,86.99% and 93.38,85.64%. The test results show that the competition among the major factors is of paramount importance. The role of copper in the system is not so much a catalyst as it can be considered as an oxidant that can be rapidly regenerated. Moreover, the optimal concentration of Cu (II) and the molar ratio of thiosulfate to copper under the experimental conditions were related. It has been determined that the leaching process is controlled by diffusion. The measured apparent activation energies of the gold dissolution reaction of gold concentrate and silver-containing pyrite are 2.96 and 2.84 kcal / mol, respectively.