高钛铝土矿的高压水化法溶出试验研究  

Leaching Experimental Study of High Titanium Bauxite through High Pressure Hydrochemical Process

作　　者：郑晓倩[1,2] 金会心[1,2] 魏国令 肖冲[1] 吴宝珍[1] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵阳550025

出　　处：《有色金属（冶炼部分）》2017年第4期25-29,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51564003);贵州省科技创新人才团队项目(黔科合人才团队[2015]4005号)

摘　　要：分别采用高压水化法和拜耳法对某高钛铝土矿进行溶出,对比两种方法对Al_2O_3及TiO2溶出率的影响。研究了高压水化条件下溶出温度、苛性碱浓度、溶出时间以及石灰添加量对高钛铝土矿中Al_2O_3及TiO_2溶出率的影响。结果表明,高压水化法更有利于提高Al_2O_3溶出率、降低TiO2溶出率,溶出效果优于拜耳法;高压水化法的最佳溶出条件为:溶出温度290℃、苛性碱浓度360g/L、溶出时间60min、石灰添加量8%,此条件下氧化铝的实际溶出率可达90.832%,TiO2的溶出率仅为4.108%。High titanium bauxite was leached by high pressure hydrochemical process and Bayer process respectively.Leaching rates of Al2O3 and TiO2 of the above two processes were compared.Effects of leaching temperature,caustic concentration,leaching time,and lime dosage on leaching rates of Al2O3 and TiO2 were investigated in high pressure hydrochemical process.The results show that high pressure hydrochemical process is superiorer to Bayer process with higher leaching rate of Al2O3 and lower leaching rate of TiO2.The practical leaching rate of Al2O3 and TiO2is 90.832% and 4.108% respectively in high pressure hydrochemical process under the optimum conditions including leaching temperature of 290 ℃,caustic concentration of 360g/L,leaching time of 60 min,and lime dosage of 8%.

关 键 词：高压水化法 高钛铝土矿 溶出条件 

分 类 号：TF821[冶金工程—有色金属冶金]