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%.
The beneficiation of silver-bearing lead-zinc-iron sulfide concentrate from Yunnan Lancang Lead Ore Co.,Ltd is very difficult because of existence of great deal of pyrite and marcasite with content up to 70%,and the a-certain-extent oxidation of galena to yellow lead.In the present work,acid pressure oxidative leaching of such complex sulfide was investigated at the temperature ranging 90～170℃ to shed new light on the deportment of silver from the source concentrates to the residue with subsequent recovery by cyanidation.Lab-scale leaching experiments were conducted in a 2L autoclave to investigate the influences of temperature,acidity,sodium iodide usage,oxygen partial pressure,oxygen flow rate on the recoveries of silver and zinc.The results obtained show that the recovery of silver depends on whether the leached silver is incorporated into jarosite or convened into silver iodide by reaction with sodium iodide.Under optimum conditions,recoveries of silver and zinc can reach 71.5% and 41.29%,respectively.
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