氧化酸浸—酒石酸络合法从铅渣选铁尾矿中回收锑铜

采用氧化酸浸—酒石酸络合法对铅渣煤基直接还原—磁选尾矿中的锑、铜进行了浸出回收试验。结果表明:1在硫酸用量为169.5 g/L、双氧水为12.50 mg/L、液固比为6∶1、温度为90℃下氧化酸浸60 min,锑、铜的浸出率分别为64.37%、85.41%,浸出率均较低。2酒石酸可通过络合反应抑制Sb3+、Cu2+的水解来提高锑、铜的浸出率。酒石酸用量为25 g/L情况下络合反应10 min,锑、铜的浸出率分别可达78.79%、90.72%,较不加酒石酸分别提高了14.42、5.31个百分点。3滤液p H值可影响Sb3+、Cu2+的稳定性,进而影响锑、铜的浸出率。滤液的p H值从7.0降至1.5,锑、铜的浸出率从78.79%、90.72%提高到86.07%、91.58%。因此,在原料氧化酸浸提取锑、铜过程,加酒石酸络合剂,并控制滤液的p H值,可有效抑制Sb3+、Cu2+的水解,提高锑、铜的浸出率。

Antimony and Copper Recovery from Iron Tailings Generated from Lead Slag Using Oxidizing Acid Leaching-Tartaric Acid Complexation

Recovery of antimony and copper by oxidation acid solution-tartaric acid complexation leaching methods from tailings of lead slag coal-based direct reduction was conducted.The results showed that:①leaching rate of antimony and copper were only 64.37% and 85.41% respectively under the optimal conditions of sulfuric acid 169.5 g/L，hydrogen peroxide 12.50 mg/L，liquid to solid ratio 6∶1 at 90 ℃ oxidized reaction 60 min.② Hydrolysis of Sb3+ and Cu2+ ion can be inhibited by complexation reaction using tartaric acid.Leaching rate of antimony and copper were 78.79%，90.72% respectively with tartaric acid of 25 g/L for reaction 10 min.The leaching rates were increased by 14.42 and 5.31 percentage points compared with without tartaric acid adding.③The stability of Sb3+，Cu2+ ion and the leaching rate of antimony and copper were also affected by filtrate pH.The leaching rate of antimony and copper increased from 78.79%，90.72% to 86.07%，91.58% respectively when filtrate pH decreased from 7.0 to 1.5.Therefore，the leaching rate of antimony and copper were improved by tartaric acid adding in oxidizing acid leaching process as the complexing agent or controlling filtrate pH to inhibithydrolysis of Cu2+ and Sb3+ ions.