云南大红山铜矿化学浸出研究

以云南大红山铜矿的铜精矿为研究对象,分别考查其在稀硫酸、硫酸高铁、硫酸亚铁三种介质中的溶解情况。通过试验研究发现,在pH1.0~2.0、常温常压条件下,该铜精矿基本不溶于稀硫酸溶液和硫酸高铁溶液,而在硫酸亚铁溶液中该铜精矿溶解速率明显加快,但浸出后期有明显的钝化现象。浸渣XRD和SEM分析表明,硫酸亚铁溶液浸出后浸出渣有单体硫物相存在,而且矿物表面有明显的"腐蚀坑",能谱分析也证实矿物表面有硫元素过量的情况。另外,硫酸亚铁溶液浸出过程中体系酸耗明显增加,这一方面是由于Fe2+离子氧化造成的,另一方面矿石的大量溶解也增加了酸耗量。

Chemical Leaching of Copper Concentrate Produced from Dahongshan Copper ores

Ist is generally accepted that ferric ions as an oxidant are effective for leaching copper sulfide but ferrous ions contribute to the leaching only as a source of ferric ions,especially in the presence of iron-oxidizing bacteria such as acidthiobacillus ferrooxidans.However,in this research the copper concentrate from Dahongshan ores in yunnan province was leached in sulfuric acid,ferric sulfate and ferrous sulfate solutions,so as to compare the effects of ferric and ferrous ions on copper extraction.Scanning electron microscopy and X-ray diffraction were used to study the surface changes occurring in chalcopyrite and compositions of the residue.It was found that ferrous sulfate was more effective in extracting copper and the surface of chalcopyrite in ferrous sulfate solution having corroded holes.