浸矿液pH对离子吸附型稀土浸出行为影响实验研究  

Experimental Study on the Influence of pH of Leaching Solution on Leaching Behavior of Ion-adsorption Rare Earths

作　　者：黄成光 王晓军[1,2] 胡凯建 周凌波 汪豪 王宇 叶华昌 HUANG Cheng-guang;WANG Xiao-jun;HU Kai-jian;ZHOU Ling-bo;WANG Hao;WANG Yu;YE Hua-chang(School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学江西省矿业工程重点实验室,江西赣州341000

出　　处：《稀土》2022年第6期35-43,共9页Chinese Rare Earths

基　　金：国家自然科学基金项目(51364011,51874148,51904119);江西省研究生创新专项资金项目(YC2020-S436);江西省教育厅科学技术研究项目(GJJ150653)。

摘　　要：为了探究浸矿液pH对离子吸附型稀土浸出行为的影响,从宏观和微观相结合的角度对离子吸附型稀土浸出行为进行了研究。实验采用不同pH硫酸镁溶液作为浸矿液对离子吸附型稀土进行室内模拟柱浸实验,同时采用核磁共振技术测定浸矿过程试样的横、纵两向反演图像及T2图谱、孔隙结构等参数,分析了不同pH(2~4.5)对离子吸附型稀土浸矿行为的影响规律。结果表明,当pH>2.5时,随浸矿液pH降低,稀土浸出率增加,浸矿过程中试样内部孔隙结构由大孔隙和超大孔隙向小中孔隙演化;当pH<2.5时,随浸矿液pH降低,稀土浸出率减小,浸矿过程中试样内部孔隙先由大孔隙和超大孔隙向小中孔隙演化,随着离子交换反应结束,小中孔隙又向大孔隙和超大孔隙演化。分析认为,这种差异是由于稀土矿体微细颗粒在孔隙表面沉积和释放动态转化过程导致,受离子置换反应引发浸矿液离子强度变化等因素影响。In order to explore the influence of the pH of the leaching solution on the leaching behavior of ion-adsorbed rare earths,the leaching behavior of ionized rare earths was studied from the perspective of the combination of macro and micro.The experiment used different pH magnesium sulfate solutions as the leaching solution to conduct indoor simulated column leaching tests on ionic rare earths.At the same time,the nuclear magnetic resonance technology was used to determine the transverse and longitudinal inversion images of the samples during the leaching process,as well as the T2map,pore structure and other parameters.The influence of different pH(2~4.5)on the leaching behavior of ion-adsorption rare earths was analyzed.The results show that when pH>2.5,the leaching rate of rare earths increases as the pH of the leaching solution decreases;during the leaching process,the internal pore structure of the sample evolves from large pores and super-large pores to small and medium pores.When pH<2.5,the leaching rate of rare earths decreases as the pH of the leaching solution decreases;during the leaching process,the internal pores of the sample first evolve from large pores and super large pores to small and medium pores,but with the end of the ion exchange reaction,the small and medium pores evolve to large and super pores.The analyses indicate that this difference is caused by the dynamic transformation process of the deposition and release of the fine particles in rare earth ore body on the pore surface,and is affected by the change of the ionic strength of the leaching solution caused by the ion displacement reaction.

关 键 词：离子吸附型稀土 柱浸 PH 孔隙演化 浸出行为 

分 类 号：TF845[冶金工程—有色金属冶金]