超声电氧化辉钼精矿研究  

Research on Ultrasonic Electro-oxidation Process of MoS_2 Concentrate

作　　者：曹占芳[1] 钟宏[1] 闻振乾[1] 符剑刚[1] 丁超[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《中国矿业大学学报》2009年第2期229-233,共5页Journal of China University of Mining & Technology

基　　金：国家"十一五"科技支撑计划项目(2007BAB22B01)

摘　　要：考察了辉钼精矿在电解NaCl溶液环境下的氧化行为及超声波对氧化浸出过程的影响.结果表明:无超声场强化时浸出表观活化能Ea较小,仅为19.7 kJ/mol,浸出过程是固膜扩散控制,浸出过程中生成的硫会形成强疏水性的致密硫膜,尤其是在堆积密度高的矿物基面上,会阻止氧化反应的进一步进行,对未反应完全的MoS2起保护作用.在无超声波的浸出过程中,浸出4 h Mo的浸出率为88%,采用超声场强化浸出过程,可以加快和强化辉钼矿的氧化分解,超声波每隔10 min发射5 min,液固比20,搅拌速度500 r/min,浸出温度40℃,NaCl浓度4 mol/L,pH为9(初始),浸出时间4 h的条件下,Mo浸出率可以达到99.6%.The oxidation of MoS2 concentrate in NaCl solution electrolysis environment and the effects of ultrasonic on leaching process were investigated. The results show that the apparent activation energy Ea for the dissolution reaction without ultrasonic field was 19.7 kJ/mol, which can be clearly confirmed as a diffusion process. The newly generate sulfur formed tight sulfur film of high hydropHobe, which will prevent the further oxidation of molybdenite, especially on the surface of accumulation with high-density. The leaching rate of Mo is 88% after 4 hours in Mo leaching process without ultrasonic field. The use of ultrasonic can strengthen and accelerate the process of MoS2 decomposition. The experimental results indicate that when the liquid-solid ratio of 20, mixing rate of 500 r/m, leaching temperature of 40 ℃, pH of 9 （initial- ization）, leaching time of 4 hours, concentration of NaCl of 4 mot/L and ultrasonic exertion of 5 min every 10 min, the leaching rate of Mo of 99.6% can be achieved.

关 键 词：湿法浸出 辉钼精矿 超声波 电氧化 动力学 

分 类 号：TQ151.4[化学工程—电化学工业]