硫酸熟化法浸出焙烧氰化尾渣中的铁  

Leaching of Iron from Roasting Cyanide Tailings by Sulfuric Acid Curing Method

作　　者：马红周[1,2] 王丁丁 王耀宁 党晓娥 王碧侠[1,2] MA Hong-zhou;WANG Ding-ding;WANG Yao-ning;DANG Xiao-e;WANG Bi-xia(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Gold and Resources of Shaanxi Province,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]陕西省黄金与资源重点实验室,西安710055

出　　处：《有色金属（冶炼部分）》2020年第10期19-22,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51974221);陕西省教育厅重点实验室科学研究计划项目(17JS067)。

摘　　要：焙烧氰化提金工艺产出大量的尾渣,为充分浸出尾渣中的铁,降低铁对金的包裹,采用硫酸熟化法对尾渣中Fe2O3的分解进行了研究,主要研究了硫酸熟化过程中硫酸加入量对渣中铁的物相影响规律,浓硫酸加入量、熟化时间对铁浸出率的影响规律。结果表明:在100℃、浓硫酸熟化氰化尾渣1h、硫酸与尾渣质量比0.6时,渣中铁的浸出率达到82.64%,主要是熟化过程中渣中难溶的Fe2O3转变为易溶的HFe(SO4)2·4H2O所致。A large amount of cyanide residue was produced by gold concentrate roasting-cyaniding process.In order to leach iron from cyanide residue and reduce iron entrapment on gold,decomposition of Fe2O3 in cyanide residue was studied by sulfuric acid curing method.Influence of sulfuric acid dosage on phase of iron in cyanide residue during sulfuric acid curing process,and influences of dosage of concentrated sulfuric acid and curing time on iron leaching rate were investigated.The results show that iron leaching rate is 82.64% when residue is cured at 100 ℃ for 1 hand mass ratio of sulfuric acid to tailings is 0.6.The high leaching rate of iron is mainly due to transformation of refractory Fe2O3 into soluble HFe(SO4)2·4 H2O in residue during curing process.

关 键 词：氰化尾渣 熟化 氧化铁 浸出 

分 类 号：TF803.2[冶金工程—有色金属冶金]