磷酸法中稀土溶出的动力学模型研究  

Study on Kinetics Model of Leaching of REES with Phosphoric Acid

作　　者：冯林永[1] 蒋训雄[1] 汪胜东[1] 范艳青[1] 张登高[1] 刘巍[1] 

机构地区：[1]北京矿冶研究总院,北京100160

出　　处：《有色金属（冶炼部分）》2016年第1期18-21,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51374037);贵州省重大科技专项(黔科合20116023)

摘　　要：利用磷酸浸出伴生稀土磷矿,研究了温度、时间、酸度、粒度与稀土浸出动力学的关系。结果表明,升高温度、延长反应时间、增大酸度、减小初始粒度均有利于稀土的浸出。界面化学反应控制为稀土浸出的控制步骤,表观反应级数0.993,表观活化能44.6kJ/mol,稀土浸出过程近似为基元反应。按反应核收缩核模型通过统计分析建立了关联温度、浓度、粒度三因素的稀土浸出数学模型。Relationships between kinetics of leaching of REEs from RE-associated phosphate ore and temperature,time,acid concentration and granularity were investigated by phosphoric acid method.The results show that increasing of temperature,time and acid concentration,and reduction of granularity can accelerate leaching of REEs.Leaching process of REEs,close to elementary reaction,is controlled by interfacial chemical reaction with apparent activation energy of 44.6kJ/mol and apparent reaction order of0.993.Kinetics mathematical model of leaching of REES relating to temperature,acid concentration and granularity is established by statistic analysis based on shrinking core model.

关 键 词：磷酸法 磷矿 稀土 动力学 

分 类 号：TF845[冶金工程—有色金属冶金]