砷硫铁的脱除对高砷金精矿氰化浸金的影响  

Effects of removal of arsenic,sulfur and iron on cyanide leaching of high-arsenic gold concentrate

作　　者：张霜华 郑雅杰 曹攀 赖慎志 张华军 ZHANG Shuanghua;ZHENG Yajie;CAO Pan;LAI Shenzhi;ZHANG Huajun(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Western Golden Yili Co.Ltd.,Yili 835100,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]西部黄金伊犁有限责任公司,新疆伊犁835100

出　　处：《中南大学学报（自然科学版）》2020年第6期1471-1480,共10页Journal of Central South University:Science and Technology

基　　金：新疆高新技术研究发展计划项目(201515108);新疆维吾尔自治区战略性新兴产业专项资金资助项目(201552)。

摘　　要：通过焙烧脱砷和硫,并采用硫酸浸出金焙砂脱铁,研究不同条件下砷、硫和铁的脱除对高砷金精矿氰化浸金的影响。研究结果表明:金精矿中,砷、硫和铁的质量分数分别为3.20%,27.35%和23.50%;在焙烧温度为500℃,焙烧时间为4 h和空气流量为0.2 m~3/h条件下,砷和硫脱除率分别达到51.53%和79.16%;所得金焙砂经过质量分数为30%硫酸浸出,铁浸出率高达98.12%,酸浸渣中砷、硫和铁质量分数分别为0.10%,0.55%和0.44%;采用质量分数为6‰的氰化钠溶液浸出酸浸渣,金浸出率达98.05%;经过对砷、硫和铁进行脱除,金品位从32.98 g/t增加到68.22 g/t;金焙砂通过酸浸,单体金和裸露金总质量分数从93.87%增加到96.66%;低温焙烧和酸浸适合高砷金精矿氰化浸金。Arsenic and sulfur were removed by roasting,and gold calcine was leached with sulfuric acid to remove iron.The effects of the removal of arsenic,sulfur and iron on gold cyanide leaching of high-arsenic gold concentrate were studied.The results show that mass fractions of arsenic,sulfur and iron in gold concentrate are 3.20%,27.35%and 23.50%,respectively.Under the conditions of roasting temperature of 500℃,roasting time of 4 h and air velocity of 0.2 m3/h,the removal rates of arsenic and sulfur are 51.53%and 79.16%,respectively.After gold calcine is leached by 30%of sulfuric acid,the leaching rate of iron is 98.12%,and the mass fraction of arsenic,sulfur and iron in acid leaching residue are 0.10%,0.55%and 0.44%,respectively.The acid leaching residue is leached with 6%of sodium cyanide solution,and the gold leaching rate reaches 98.05%.After removing arsenic,sulfur and iron,Au grade increases from 32.98 g/t to 68.22 g/t.The total mass fraction of monomer gold and bare gold increases from 93.87%to 96.66%after acid leaching of gold calcine.Roasting in low temperature and acid leaching are suitable for cyanide leaching of high-arsenic gold concentrate.

关 键 词：金精矿 砷 硫 铁 脱除率 氰化浸金 

分 类 号：TF831[冶金工程—有色金属冶金]