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由于含有大量的黄铁矿和白铁矿(它们约占原矿的70%,质量分数),以及闪铅矿一定程度上的氧化,云南澜沧铅矿股份有限公司所产的富银硫化矿难以富集。本文通过对该矿在90~170℃下氧压酸浸,以期连同后面的氰化能提取精矿中的银。通过进行2L高压釜的小型试验,考察了温度、酸度、碘化钠用量、氧分压、氧气流速对银和锌回收率的影响。结果表明,银的回收率取决于银是否进入黄钾铁矾渣,或者与碘化钠反应生成碘化银沉淀。在优化的条件下,银和锌的回收率分别达到71.5%和41.29%。
Due to the large amount of pyrite and white iron ore (which account for about 70% of the ore) and a certain degree of oxidation of the glitter, the Yunnan-Lancang Pb ore Co., Ltd. produces silver-rich sulfide ore difficult to Enriched. In this paper, by acid leaching of the ore at 90-170 ℃, with the subsequent cyanidation can extract the silver concentrate. The effects of temperature, acidity, sodium iodide dosage, partial pressure of oxygen and oxygen flow rate on the recovery of silver and zinc were investigated. The results show that the silver recovery rate depends on whether the silver into the jarosite slag, or with sodium iodide to form silver iodide precipitation. Under optimized conditions, the recoveries of silver and zinc reached 71.5% and 41.29% respectively.