摘要
某金矿石中黄铁矿含量5.31%、氧化率6.02%,直接氰化金浸出率仅27.78%,属典型的低品位硫化物包裹型难处理金矿。为评估生物堆浸预氧化工艺对该矿石的工业化应用前景,开展了直接氰化试验、生物搅拌预氧化-氰化试验和生物柱浸预氧化-氰化试验,考察了黄铁矿氧化率和金浸出率的关系以及温度对黄铁矿氧化率和金浸出率的影响。生物柱浸试验获得良好指标:原生矿破碎至D80=5.5 mm,在室温条件下(8~30℃)预氧化221 d后,黄铁矿氧化率52.30%,金的浸出率为62.70%,氰化渣金品位为0.47 g/t,较直接氰化浸出金浸出率(27.78%)提高34.92个百分点。
A gold ore with high pyrite content(5.31%)and low oxidation rate(6.02%)belongs to a typical low-grade refractory sulfidic gold-bearing ore,the gold leaching rate by a direct cyanide-leaching was only 27.78%.In order to evaluate the industrial application prospect of bio-preoxidation heap leaching process,direct cyanide leaching test,bio-stirring pre-oxidation test and bio-column leaching test were carried out to investigate the relationship between pyrite oxidation rate and gold leaching rate and the effect of temperature on pyrite oxidation rate and gold leaching rate.The results of bio-column leaching test showed that under the conditions of D 80=5.5 mm and at room temperature(8—30℃),about 52.30%of the pyrite was oxidized after 221 days,the leaching rate of gold came to 62.70%,which was 34.92 percentage points higher than that of direct cyanide leaching(27.78%),and the gold grade of leaching residue can be decreased to 0.47 g/t.
作者
谭巧义
高立强
贾先兵
贾炎
孙和云
牛晓鹏
赵海平
阮仁满
TAN Qiaoyi;GAO Liqiang;JIA Xianbing;JIA Yan;SUN Heyun;NIU Xiaopeng;ZHAO Haiping;RUAN Renman(Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;National Engineering Research Center of Green Recycling for Strategic Metal Resources,Beijing 100190,China;Norin Mining Limited,Beijing 100053,China;Management Committee of Zhongguancun Science Park’s Xicheng Park,Postdoctoral Programme,Norin Mining Limited Branch,Beijing 100053,China)
出处
《有色金属工程》
CAS
北大核心
2024年第3期63-69,共7页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51674231)。
关键词
难处理金矿
生物预氧化
黄铁矿
柱浸
refractory gold ores
biological preoxidation
pyrite
column leaching tests
