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某含砷含碳微细粒难处理金精矿劫金性能分析表明,劫金指数为2.52 g Au/t,劫金能力为105.93 g Au/t,属于高劫金难处理金精矿。为获得适宜的预氧化-提金工艺,比较研究了焙烧、臭氧、微波、化学、生物等预氧化工艺,并对预氧化渣进行了氰化浸出。结果表明:该金精矿适宜的处理工艺为生物预氧化-氰化浸出-强化浸出。金精矿经生物预氧化12天,硫和砷的氧化率分别为85.26%和65.75%,生物预氧化渣经氰化浸出和强化浸出,最终黄铁矿氧化率达到98.70%,金浸出率为82.77%,有机碳降解率为7.45%。拉曼光谱分析表明,金精矿中碳质物的石墨化程度较低,劫金能力较强。经生物预氧化后有机碳含量有所减少,石墨化程度降低,但碳质物的劫金性能增强。金物相分析发现,部分金不能浸出的原因主要为有机碳劫金及脉石包裹所致。
Analysis of arsenic-containing carbon fine gold refractory gold concentrate robbery performance analysis showed that gold robbery gold index of 2.52 g Au / t, gold robbery ability of 105.93 g Au / t, belonging to a high gold robotic gold refractory gold concentrate. In order to obtain the suitable pre-oxidation-leaching process, the pre-oxidation process of roasting, ozone, microwave, chemical and biological was comparatively studied, and the pre-oxidation residue was cyanidated. The results show that the suitable treatment process of the gold concentrate is biological pre-oxidation-cyanidation leaching-enhanced leaching. The biodegradation rate of gold and gold was 85.26% and 65.75% respectively after biological pre-oxidation for 12 days. The biological pre-oxidation residue leached by cyanidation and leaching enhanced. The final pyrite oxidation rate reached 98.70%, and the gold leaching rate was 82.77%, organic carbon degradation rate of 7.45%. Raman spectroscopy analysis showed that the carbonaceous material in the gold concentrate has a low degree of graphitization and strong gold robbing ability. After biological pre-oxidation organic carbon content decreased, the degree of graphitization decreased, but the carbonaceous material robbed gold performance increased. The analysis of gold phase found that some of the gold can not be leached mainly due to organic carbon robbery and gangue wrapped.