Column leaching process of rare earth and aluminum from weathered crust elution-deposited rare earth ore with ammonium salts  

铵盐柱浸风化壳淋积型稀土矿中的稀土和铝（英文）

作　　者：何正艳[1] 张臻悦[1] 余军霞[2] 徐志高[2] 徐源来[2] 周芳[2] 池汝安[1,2] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]武汉工程大学绿色化工过程教育部重点实验室,武汉430073

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第11期3024-3033,共10页中国有色金属学报（英文版）

基　　金：Projects(51274152,41472071)supported by the National Natural Science Foundation of China;Project(T201506)supported by the Program for Excellent Young Scientific and Technological Innovation Team of Hubei Provincial Department of Education,China

摘　　要：In order to better understand the leaching process of rare earth （RE） and aluminum （Al） from the weathered crust elutiondepositedRE ore, the mass transfer of RE and Al in column leaching was investigated using the chromatographic plate theory. Theresults show that a higher initial ammonium concentration in a certain range can enhance the mass transfer process. pH of leachingagent in the range of 2 to 8 almost has no effect on the mass transfer efficiency of RE, but plays a positive role in the mass transferefficiency of Al under strong acidic condition （pH〈4）. There is an optimum flow rate that makes the highest mass transfer efficiency.The optimum leaching condition of RE is the leaching agent pH of 4？8, ammonium concentration of 0.4 mol/L and flow rate of0.5 mL/min. The mass transfer efficiencies of RE and Al both follow the order： （NH4）2SO4〈NH4Cl〈NH4NO3, implying thecomplexing ability of anion.为了更好地了解风化壳淋积型稀土矿中稀土和铝的浸出过程,运用色谱塔板理论对稀土和铝的柱浸传质过程进行研究.结果表明,在一定范围内,提高铵根离子浓度能强化浸出传质过程.浸取剂pH 在2-8 的范围内对稀土的浸取传质效率几乎没有影响,而在强酸性条件下（pH〈4）能提高铝的浸出传质效率.存在一最佳流速使浸取传质效率最高.稀土的最佳浸取条件如下：浸取剂pH 4-8、铵根离子浓度0.4 mol/L、流速0.5 mL/min.稀土和铝的浸出传质效率由低到高的顺序均为（NH4）2SO4〈NH4Cl〈NH4NO3,这反映了阴离子与它们络合能力的强弱.

关 键 词：column leaching process weathered crust elution-deposited rare earth ore rare earth ALUMINUM ammonium salt MASSTRANSFER 

分 类 号：TF845[冶金工程—有色金属冶金] TF821