锌浸出渣中银浮选工艺优化工业试验

基于前期的实验室研究,对河南某锌冶炼厂低酸浸出渣浮选回收银浮选优化工艺进行了工业试验。采用原生产流程,调整优化生产现场矿浆浓度(保持在30%以上)和药剂制度(采用Z-200作辅助捕收剂,活性炭为载体,不再添加黄药)、工艺设备及其工作参数后进行了工业试验。结果表明,工艺优化后,银精矿品位由3000 g/t提高至6740.4 g/t,银回收率由60%~64%提高到73.17%;精矿产率降低到原工艺的三分之一,减少了银精矿所带走的锌损失;精矿中金品位由1.5 g/t提高到5.3 g/t以上,提高了金的回收率。

Industrial Test on Process Optimization for Silver Flotation from Zinc-leached Residues

Based on the previous laboratory results, an industrial test was carried out on the process optimization for silver flotation from low acid-leached residues of some zinc hydrometallurgy factory in Henan. Adopting the original production process, we adjusted and optimized the pulp density, reagent system, process equipment and its working parameters on the production site. The pulp density was kept above 30% and the reagent system consisted of Z-200 as the auxiliary collector and activated carbon as the vector. No more butyl xanthate was added into the system. The test showed that, after the process optimization, the silver concentrate grade was elevated from about 3000 to 6740.4 g/t and the recovery rose to 73.17% from 60%~64%. Meanwhile, the silver concentrate amount was cut by about 66.6%, which greatly reduced zinc loss, in return. Moreover the gold concentrate grade was increased from 1.5 to 5.3 g/t, and the gold recovery was improved.