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针对传统氧化焙烧-氰化浸金工艺环境污染严重的现状,采用焙烧-自浸出工艺提取载金硫化物中的金.研究焙烧温度、焙烧时间和试样量对单质硫转化率和金浸出率的影响,通过X射线衍射分析、扫描电镜观察、能谱分析等手段分析焙烧过程中载金硫化物中硫的物相转变规律.载金硫化物中黄铁矿发生热分解反应生成单质硫和磁黄铁矿,随焙烧温度的升高和焙烧时间的延长,黄铁矿的特征衍射峰强度逐渐减小直到消失,磁黄铁矿的特征衍射峰逐渐生成并增强,原本致密状的黄铁矿颗粒变得疏松多孔.50 g试样在氮气流量1 L·min-1、焙烧温度800℃、焙烧时间60 min的条件下,单质硫的转化率达到42.53%,金浸出率达到88.70%,实现载金硫化物的高效非氰浸出.
In view of the serious environmental pollution of the traditional oxidation roasting-cyanidation leaching process, gold in gold-bearing sulfides was extracted by roasting-leaching process.The effect of roasting temperature, roasting time and sample volume on the conversion rate of single-sulfur and gold leaching , The phase transformation of sulfur in the gold-supported sulfides during calcination was analyzed by means of X-ray diffraction analysis, scanning electron microscopy and energy spectrum analysis, etc. The pyrite in the sulfides contained pyrolytic decomposition reaction to generate elemental sulfur and Pyrrhotite, with the increase of calcination temperature and calcination time, the characteristic diffraction peak intensity of pyrite gradually decreases until it disappears, and the characteristic diffraction peak of pyrrhotite is gradually formed and enhanced. The original compact pyrite The ore particles became porous and porous.The conversion rate of elemental sulfur reached 42.53% and the leaching rate of gold reached 88.70% at nitrogen flow rate of 1 L · min-1, calcination temperature of 800 ℃ and calcination time of 60 min, Achieve gold-bearing sulfides efficient non-cyanide leaching.