银泥湿法冶炼脱锌与分银工艺的优化

Process Optimization of Zinc Removal and Silver Separation of Silver Mud by Hydrometallurgy

金银湿法生产试验研究得出优化脱锌工艺过程中,硫酸投加量由原先理论用量的2.5倍降为投加2倍硫酸理论用量,反应温度控制在70℃,能稳定保持较高的脱锌率,脱锌渣中锌含量在1.5%左右,有效地减少了脱锌过程中硫酸的消耗(同比降低了20%硫酸消耗)以及脱锌率的提高(由原先80%左右的脱锌率提高到现在的87.5%)。分银工艺的优化重心在调整硝酸配比,通过生产试验探索,找到了较为理想的硝酸配比,由原先水比硝酸1∶1调整为水比硝酸3∶2(重量比),显著提高了硝酸利用率,节约了生产成本,和原工艺相比,硝酸利用率提高了12.5%。

In the process of zinc removal by gold and silver hydrometallurgy, the amount of sulfuric acid was reduced from 2. 5 times to 2 times of the theoretical amount, reaction temperature was controlled at 70 degrees, which could maintain the stability of the high zinc removal rate and the zinc content in zinc slag was about 1.5 %, and effectively reduce the sulfuric acid consumption 20% and increase the rate of zinc from the original 80% to 87.5%. The optimization of silver separation process focused on adjusting the ratio of nitric acid. Through the exploration, it cracked the ideal ratio of nitrate, adjusting from the original ratio 1 ： 1 to 3 ： 2 （ weight ratio） , and significantly increased the nitrate utilization rate, saved the cost of production. Compared to the original process, the nitrate utilization rate was increased by 12.5%.