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在本研究中,应用硫代硫酸铵溶液浸出海绵金(纯度为99 92 % ) ,考察了CuSO4 、(NH4 ) 2 S2 O3、(NH4 ) 2 SO4 、NH4 OH和浸出时间对金的浸出率和硫代硫酸盐氧化率的影响。在反应中,用铜离子作为金溶解的催化剂,但它也加速了硫代硫酸盐的氧化(消耗)。研究发现,金浸出的最佳条件为:(0 8～1 0 )·10 3mol/m3(NH4 ) 2 S2 O3、3 0mol/m3CuSO4 、(2 0～3 0 )·10 3mol/m3NH4 OH、(0 4～0 5 )·10 3mol/m3(NH4 ) 2 SO4 、pH为10±0 2、搅拌速度15 0r/min和浸出时间43 2ks。硫代硫酸盐的氧化率约为初始浓度的15 %。研究还发现,用三辛基甲基氯化铵(TOMAC)作为萃取剂从含金溶液中回收金不需要对pH值和其他条件调节。考察了金的浓度、pH值、氨浓度、硫代硫酸盐和铜离子浓度、萃取剂和稀释剂浓度以及萃取时间对金萃取率的影响。试验发现,硫代硫酸盐溶液在最佳浸出条件下(萃取剂用正辛烷稀释至180mol/m3,有机相与水相比为1∶1,萃取时间0 6ks) ,金的萃取率可达10 0 %。用10 %的硫脲可反萃取10 0 %的金
In the present study, the leaching of sponge gold (99 92% purity) by ammonium thiosulfate solution was used to investigate the effects of CuSO4, (NH4) 2 S2 O3, (NH4) 2SO4, NH4 OH and leaching time on the gold leaching rate and Effect of thiosulfate oxidation rate. In the reaction, copper ion is used as a gold-solubilizing catalyst, but it also accelerates the oxidation (consumption) of thiosulfate. The results show that the optimum conditions for gold leaching are as follows: (0 8 ~ 10) · 10 3mol / m3 (NH4) 2 S2 O3, 30mol / m3 CuSO4, (20 ~ 30) · 10 3mol / 0 4 ~ 0 5) · 10 3mol / m3 (NH4) 2 SO4, pH 10 ± 0 2, stirring speed 15 0r / min and leaching time 43 2ks. The thiosulfate oxidation rate is about 15% of the initial concentration. The study also found that recovery of gold from the gold-containing solution using trioctylmethylammonium chloride (TOMAC) as an extractant did not require adjustment of pH and other conditions. The effects of gold concentration, pH value, ammonia concentration, thiosulfate and copper ion concentration, extractant and diluent concentration, and extraction time on gold extraction rate were investigated. It was found that thiosulfate solution under the optimal leaching conditions (extractant diluted with n-octane to 180mol / m3, the organic phase compared with water 1: 1, extraction time 0 6ks), the extraction rate of gold up to 10 0%. 10% gold can be back-extracted with 10% thiourea