响应面法优化硝酸浸铅锌矿尾渣回收银工艺研究

Silver extraction using nitric acid from lead-zinc mine tail slag by response surface design

以硝酸浸铅锌矿尾渣回收银工艺进行了研究。以银浸出率为评价指标,探讨了硝酸质量浓度、液固比、浸出时间和浸出温度对回收银工艺的影响。在单因素实验的基础上,利用响应面法对银浸出的条件进行了优化。结果表明,当硝酸质量浓度为33.16%,液固比为16.39∶1,在64.62°C的条件下浸出1.3 h,该模型预测的最大银浸出率为69.73%。验证实验误差<3%,表明该模型与实际情况拟合良好。

The extraction process using nitric acid leaching silver from lead-zinc mine tail slag was studied. According to silver leaching rate using as an evaluation index, the effect of nitric acid mass concentra- tion, the liquid-solid ratio,leaching time and leaching temperature on silver leaching rate was discussed. Based on single factor experiment, the leaching condition is further optimized by response surface method. The results showed that the largest model silver leaching rate of 69.73% was obtained under the eonditions of the concentration of 33.16% nitric acid quality and the liquid-solid ratio of 16.39：1 at 64.62 ℃ for 1.3 h. The verify error of the model was less than 3% ,and the model was fitted for the actual experi- ments well.