某硫精矿中的银矿物嵌布粒度非常细小,包裹于硫化物中的银约占50.46%,属于难处理高砷含银硫精矿.采用细磨后化学预处理氰化浸出,银浸出率仍然低于80%;硫精矿经氧化焙烧后, As、S的脱除率都达到90%以上,但银浸出率却较低;对该含银硫精矿添加钠盐焙烧预处理,再采用常规氰化法浸出,银浸出率显著提高,达到85.15%,同时氰化钠耗量降低至2.0 kg/t.
The silver bearing sulfur concentrate is refractory one due to its high arsenic and its fine silver minerals. The cyanidation leaching rate of silver was low (<80%) despite the sulfur concentrate was treated by fine grinding and chemical reagent. After oxidation roasting, the removal rates of As and S in concentrate reached 90% above, however the leaching rate was still low. The leaching rate was significantly improved when the concentrate was roasted by adding NaXY. The leaching rate can reach 85.15% and the consumption of NaCN reduced to 2.0 kg/t.
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