难处理金矿加压预氧化扩大连续试验

Continuous Pilot Experiment of Pressure Pre-oxidation of Refractory Gold Ore

贵州水银洞金矿为含砷、炭质的"卡林型"难处理金矿,通过常规工艺处理无法产生效益,为开发这类金矿资源,通过工艺对比,选择加压预氧化工艺进行试验研究。小型试验结果表明,在推荐条件下,硫氧化率>99%,金浸出率>94%。为获得工业设计需要的研究数据,自主建设一套可连续投料的加压预氧化中试系统,并顺利完成扩大连续试验,在温度210~220℃、加压氧化60~90min,氧分压0.6~0.8MPa条件下,硫平均氧化率大于97%,金平均浸出率96%,验证了小试结论,打通了整体工艺流程,为工业应用提供了设计依据。

Guizhou Shuiyindong Gold Mine is a"Carlin-type"refractory gold mine containing arsenic and carbon,which cannot produce benefits through conventional processing.In order to develop this type of gold resources,through process comparison,the pressurized pre-oxidation process is selected for experimental research.Test results of multi-factor laboratory study show that sulfur oxidation rate is >99% and gold leaching rateis>94% under the recommended conditions.In order to obtain research data required by industrial design,a set of pressurized pre-oxidation pilot system with continuous feeding is built independently and pilot test is successfully completed.Under the conditions of pressurized oxidation at 210—220℃for 60-90 min with oxygen partial pressure of 0.6-0.8 MPa,average oxidation rate of sulfur is higher than 97% and average leaching rate of gold is 96%,which verifies the conclusion of laboratory research and opens up the overall process flow.It provides an important design basis for industrial application of this process.