【摘要】 结合化学成分、物相分析和氰化浸金实验,研究酸性浸锑渣的浸金特性以及氧化焙烧预处理对浸金的影响机理,并考察酸法浸锑-氧化焙烧脱硫-氰化浸金的工艺流程。结果表明:黄铁矿包裹金是造成酸性浸锑渣中金难浸的主要原因,经氧化焙烧后,焙砂中单质硫和硫化物的含量显著降低,总硫含量降至0.15%(质量分数),硫化物转变为赤铁矿,焙砂的氰化浸金率达95.92%,比酸性浸锑渣直接浸金提高了24%。更多还原

【Abstract】 Combined with chemical composition, physical phase analysis and gold cyanidation experiment, the characteristics of gold leaching and the affecting mechanism of oxidizing roasting pretreatment were studied on an acidic antimony leaching residue. The process of acid antimony leaching-oxidizing roasting desulfurization-gold cyanidation was also investigated. The results show that being wrapped in pyrite is the primary cause for low leaching rate of gold in the acidic antimony leaching residue. Pretreated by oxidizing roasting, the contents of elemental sulfur and sulfide decrease sharply. As a result, the total sulfur content in the calcine diminishes to only 0.15%(mass fraction) and the ferrous sulfide converts into hematite. The leaching rate of gold cyanidation from the calcine increases up to 95.92%,showing a favorable increment of 24% compared with that of direct leaching from the acidic antimony leaching residue.更多还原