难处理金矿热压氧化工艺研究

本试验以国内某超细微难处理金矿为研究对象,开展酸性热压氧化工艺研究；分析了温度因素对硫化矿物氧化、元素迁移和金氰化浸出等的影响。试验结果表明,通过温度变化可影响黄铁矿和砷黄铁矿氧化反应速率,进而对S、Fe和As元素的迁移状态产生影响。反应温度越高黄铁矿和砷黄铁矿氧化越彻底,有利于金的氰化浸出；完全氧化后金的浸出率约为94%。浮选金精矿中的黄铁矿、砷黄铁矿逐渐氧化转变为砷酸铁盐、铁砷硫硅等多元素共沉物质,未发现有碱式硫酸铁或铁矾物相,反应生成的各种沉淀产物对浸出率无显著影响。 

Research on pressure oxidation for refractory gold concentrate

The acid pressure oxidation of refractory gold concentrate was studied, and the effect of temperature on the oxidation of sulfide minerals, the migration of element and gold cyanide leaching were studied. Experimental results show that the reaction rate of pyrite and arsenopyrite was influenced by temperature, the highest gold cyanide leaching rate (94%) was obtained at 215℃. In the solid phase, pyrite and arsenopyrite had transformed gradually into Ferric arsenate or the co-deposition that was containing iron, arsenic, sulfur, silicon, and other elements. The precipitation produced during the reaction had no significant effect on cyanide leaching.