微细浸染型金矿酸性热压氧化预处理动力学研究  

Study on the Kinetics of Pretreatment for Micro-disseminated Sulfide Gold Ores by Acidic Autoclave Oxidation

作　　者：冯吉福[1] 周卫宁[1] 李尽善 袁江涛[1] 罗星[1] 马荣锴[1] FENG Jifu;ZHOU Weining;LI Jinshan;YUAN Jiangtao;LUO Xing;MA Rongkai(China Nonferrous Metal Guilin Geology and Ming Co. Ltd., Guilin 541004, Guangxi, China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《贵金属》2017年第3期10-16,共7页Precious Metals

基　　金：广西科技开发项目(桂科AB16380023)

摘　　要：以氧气消耗速率表征氧化速率,研究了微细浸染型硫化物金矿热压氧化预处理过程动力学的影响因素,考察了矿浆pH值、温度、矿样粒度、氧分压、气液界面面积和矿浆浓度对氧化速率的影响,以及氧化率和氧化速率的关系。结果表明,矿浆pH<2.5时,保持较高的氧化速率;氧化速率随温度升高、氧分压增加和矿浆浓度降低而增大;增加气液接触面积可提高氧化速率,当矿浆浓度为33%、氧分压1.6 MPa,在优化条件下,气液接触比表面积达到25 m2/m3,40 min可完成氧化预处理。The reaction of oxidation pretreatment was characterized by the oxygen consumption rate.The influencing factors on dynamics of autoclave oxidation pretreatment were studied in the micro-disseminated sulfide gold ore.The impacts on the oxidation rate by the initial pH of slurry,temperature,particle size,oxygen pressure,gas-liquid interfacial area,slurry concentration wereinvestigated.The relationship between the degree and reaction rate of oxidation was also explored.The results showed that a high reaction rate of oxidation would be maintained when the pH of the slurry was less than2.5.The oxidation would accelerate,as the temperature and oxygen pressure was increased while the slurry concentration was reduced.The reaction rate of oxidation could also be improved by rising gas-liquid interfacial area.The oxidation pretreatment could be finished in40min under the optimized conditions,when the slurry concentration was33%,oxygen pressure was1.6MPa,gas-liquid interfacial area was25m2/m3.

关 键 词：冶金原料与预处理 热压氧化 硫化物金矿 动力学 

分 类 号：TF831[冶金工程—有色金属冶金]