| 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. |
