某含砷硫金精矿酸性氧化预处理机理及其反应动力学  

Mechanism and Reaction Kinetics of Acidic Oxidation Pretreatment of Arsenic and Sulfur-bearing Gold Concentrate

作　　者：马英强[1] 盛秋月 印万忠[1,2] 洪正秀[3] 唐浪峰 Yingqiang MA;Qiuyue SHENG;Wanzhong YIN;Zhengxiu HONG;Langfeng TANG(College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350116, China;College of Resourees and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, China;College of Geoexploration Engineering, Kimchaek University, of Technology, DPR 999093, Korea)

机构地区：[1]福州大学紫金矿业学院,福建福州350116 [2]东北大学资源与土木工程学院,辽宁沈阳110819 [3]朝鲜金策工业综合大学地质勘探学院,朝鲜999093

出　　处：《过程工程学报》2018年第3期522-529,共8页The Chinese Journal of Process Engineering

基　　金：矿物加工科学与技术国家重点实验室开放研究基金专项资助(编号:BGRIMM-KJSKL-2017-14);紫金矿业集团博士后科技项目;福建省教育厅资助项目(编号:JAT160058);福州大学贵重仪器设备开放测试基金资助项目(编号:2018T038);福建省自然科学基金资助项目(编号:2015J05101)

摘　　要：针对国内某金精矿中金嵌布粒度细且大部分被黄铁矿、毒砂包裹,难以浸出的现状,采用HCl-H2O2体系对其进行酸性氧化预处理,分析了氧化预处理的机理和动力学.结果表明,在盐酸浓度0.7 mol/L、矿浆浓度40 g/L、金精矿粒度小于48μm占90%以上、搅拌速度400 r/min、温度60℃和H2O2浓度0.5 mol/L的条件下,金精矿中Fe和As的溶解率分别达45.9%和99.6%,利于包裹金释放和浸出.酸性条件下,金精矿中的黄铁矿和毒砂可被H2O2氧化分解,符合产物层扩散为速率控制的固相反应收缩核模型.Gold leaching for a gold concentrate was difficult due to the fine disseminated grain sizes and large amounts of the gold mineral wrapped by pyrite and arsenopyrite. Some of tests regarding acidic oxidation pretreatment in the systems of HCl-H2O2 and the mechanism and reaction kinetic analysis were carried out. The results showed that under the conditions of dosage of HCl 0.7 mol/L, pulp contentation of 40 g/L, particle size of less than 48 μm accounted for more than 90%, stirring speed of 400 r/min, reaction temperature of 60 ℃, dosage of H2O2 0.5 mol/L, the dissolution rates of iron and arsenic were 45.9% and 99.6%, respectively, acidic oxidation pretreatment benefited the gold leaching. Under acidic conditions, pyrite and arsenopyrite in gold concentrate could be oxidized by H2O2, the process conforms to the shrinking core model（SCM）, and the reaction velocity was controlled by the products layer diffusion.

关 键 词：含砷硫金精矿 预处理 黄铁矿 毒砂 反应动力学 

分 类 号：TD926[矿业工程—选矿]