摘要
针对湖南某难处理金精矿进行预处理技术研究.该矿含砷(质量分数)为11.28%,金的直接氰化浸出率为21.91%.矿石中的砷以毒砂形式存在.载金矿物为毒砂和黄铁矿等硫化物,金为微细浸染型被毒砂和黄铁矿包裹.通过加压预氧化,对矿石进行氰化浸金试验研究.加压氧化最佳条件为初始酸度1 mol/L,木质素磺酸钠5 g/t,硝酸硫酸比7∶1,氧压0.6 MPa,搅拌速度300 r/min,时间100 min,温度100℃,矿浆浓度20%.试验表明经过加压试验后,金的氰化浸出率达到90.87%,与未预处理相比提高了68.96%,达到了较好的试验效果.
The preprocessing technique for a refractory gold concentrate in Hunan Province PRC was investigated experimentally, which contains 11.28 % arsenic and its direct cyaniding leaching rate of gold is 21.91%. The occurrence form of arsenic in concentrate is mainly the arsenopyrite, and the gold-bearing minerals are arsenopyrite and pyrite, where the minutely dipped gold grains are wrapped up by arsenopyrite and pyrite. After pressure preoxidation, an experiment was done to extract gold from refractory gold concentrate by cyaniding leaching. The optimal conditions for pressure prcoxidation are: initial acidity is 1 mol/L, content of sodium lingosulfonates 5 g/t, ratio of HNO3 to H2SO4 is 7 : 1, pressure 0.6 MPa, stirring speed 300 rpm, processing time 100 min at 100 ℃ and .sampling pulp density 20%. The results showed that after the pressure prcoxidation, the cyaniding leaching rate of gold comes to 90.87%, i.e. , 68.96% is increased in comparison with the process without pressure preoxidation.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2007年第9期1305-1308,共4页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(50674029)
国家高技术研究发展计划项目(2006AA06Z127)
教育部高等学校博士学科点专项科研基金资助项目(20060145015)
辽宁省自然科学基金资助项目(20052030)
关键词
难处理金矿
加压氧化
氰化浸金
预处理
毒砂
高砷金矿
refractory gold ore
pressure preoxidation
gold cyaniding leaching
pre-ireatment
arsenopyrite
high-arsenic gold concentrate