沸腾焙烧预氧化处理含砷金精矿工艺研究  

Study on Preoxidation of Arsenic-bearing Gold Concentrate by Fluidized Bed Roasting

作　　者：简椿林[1] JIAN Chun-lin(Zijin Mining Group Co.,Ltd.,Shanghang 364200,Fujian,China)

机构地区：[1]紫金矿业集团股份有限公司,福建上杭364200

出　　处：《有色金属（冶炼部分）》2020年第11期65-70,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51564021)。

摘　　要：对沸腾焙烧预氧化处理含砷金精矿的工艺过程进行了研究。考察了焙烧气氛、焙烧预处理剂等因素对焙砂表面形貌、金银浸出率及氰化尾渣中金银残留量的影响。结果表明:含砷难处理金精矿在富氧焙烧气氛下所得焙砂表面出现气孔较为均匀的形貌;对氰原(氰化原料,酸浸渣)与氰化尾渣中金银进行化学物相分析发现,硅酸盐包裹是影响金银氰化浸出的主要因素。富氧焙烧气氛下,采用NaOH:Na2CO3=1:2复合添加剂所得氰原中硅酸盐包裹金银占比明显下降,焙烧效果大幅改善,金、银浸出率分别提高7.27与13.6个百分点。Preoxidation of arsenic-bearing gold concentrate by fluidized bed roasting was studied Effects of roasting atmosphere and roasting pretreatment agent on surface morphology of calcine,leaching rates of gold and silver,and residual amount of gold and silver in cyanide tailings were investigated The results show that the calcine obtained from arsenic-bearing refractory gold concentrate roasted in oxygen-enriched air has uniform pores on its surface.Chemical phase analysis of cyanogen(raw materials for cyanide,acid leaching residues) and gold and silver in cyanide tailings show that silicate encapsulation is the main factor affecting cyanide leaching of gold and silver.Under oxygen-enriched roasting atmosphere,proportion of silicate coated gold and silver in cyanogen obtained with NaOH:Na2 CO3=1:2 composite additive reduce obviously,roasting effect is greatly improved,and leaching rate of gold and silver rises by 7.27 and 13.6 percentage points,respectively.

关 键 词：含砷金精矿 沸腾焙烧 浸出率 预氧化 

分 类 号：TF831[冶金工程—有色金属冶金]