某碳质金精矿富氧焙烧—氯化浸出试验研究  

Experimental research on oxygen-enriched roasting-chlorination leaching process of a carbonaceous gold concentrate

作　　者：杨凤云 Yang Fengyun(Langfang China Railway Geophysical Exploration Co.,Ltd.)

机构地区：[1]廊坊市中铁物探勘察有限公司

出　　处：《黄金》2020年第2期57-61,共5页Gold

摘　　要：某碳质金精矿直接氰化浸出金浸出率很低,小于30%,为进一步提高金浸出率,针对碳质金精矿性质,进行了富氧焙烧—氯化浸出试验研究。结果表明:与常规氧化焙烧相比,富氧焙烧降低了焙烧温度,缩短了焙烧时间;富氧焙烧最佳焙烧温度550℃~600℃,氧气体积分数50%,焙烧时间2.0 h,在此条件下,碳、硫去除率均在95%以上;焙砂采用M-NaCl氯化浸出,在最佳浸出条件为固液比1∶6,浸液pH=3,浸出剂用量8 kg/t,试样粒度62~75μm,浸出时间4 h时,金浸出率可达92.50%,相对于试样直接氯化浸出时有显著提高;表明富氧焙烧—氯化浸出工艺是可行的。Since direct cyanide leaching of a carbonaceous gold concentrate has a very low leaching rate,which is lower than 30%,experimental study was carried on oxygen-enriched roasting-chlorination leaching of a carbonaceous gold concentrate to improve gold leaching rate.The results showed that compared with conventional oxidation roasting,oxygen-enriched roasting not only could reduce the roasting temperature,but also could shorten the roasting time;when the optimum oxygen-enriched roasting temperature is 550℃-600℃,the optimum oxygen volume fraction is 50%,and the optimum roasting time is 2.0 h,both the deprivation rate of carbon and sulfur is over 95%in the optimum conditions.The calcine is chlorinated in M-NaCl.The results proved that the extraction rate of gold could reach 92.50%,when the optimum leaching conditions were:the solid-liquid ratio was 1∶6,the lixivium pH was 3,amount of leaching agent was 8 kg/t,test sample particle size was 62-75μm and the leaching time was 4 hours,when the test sample was directly subjected to chlorination leaching.The process of oxygen-enriched roasting-chlorination leaching is feasible.

关 键 词：碳质金精矿 富氧焙烧 氯化浸出 有机氯化剂 氯化钠 

分 类 号：TD953[矿业工程—选矿]