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《Chinese Journal of Rare Metals》 2018-05
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Percolation Leaching Behavior of Ion-Adsorption-Type Rare Earth Ore

Zhou Hepeng;Hu Jie;Luo Xianping;Zhong Zhigang;Faculty of Resource and Environmental Engineering,Jiangxi University of Science and Technology;Jiangxi Key Laboratory of Mining Engineering;  
Ion-adsorption-type rare earth ore has complex properties. At present,in-situ leaching process lacks adaptability,and there are many influencing factors. In order to reveal impact mechanism of ion-type rare earth ore in-situ leaching process,and explore optimal control method,the indoor column leaching method was used to simulate in-situ leaching process,with the raw material of iontype rare earth ore from Longnan-Zudong of Jiangxi province. The technological factors of leaching process on the leaching efficiency of ion-type rare earth ore and infrared spectroscopic analysis before and after leaching were investigated. The results showed that the rare earth leaching rate was 92. 87%,and leaching liquid average concentration was 1. 73 g·L-1,under the condition of the raw ore0. 078% for total REO,when optimum leaching condition parameters were as follows: the raw ore moisture content was 4%,ledge height was 43 mm,leaching agent concentration was 4%,leaching solution p H value was 5. 0,solid-liquid ratio of leaching process was 1. 0∶ 0. 8,velocity of leaching agent was 5 ml·min-1 in the leaching process of ionic type rare earth ore. The ions exchange reaction happened between rare earth ions and electrolyte ion of leaching agent in the leaching process. Rare earth ions were exchanged,while electrolyte cation retained in the leach residue. The leaching process did not generate other new substances. There was no change of ionic type rare earth ore original crystal structure. It would not affect the percolation leaching of ion-type rare earth ore,which was beneficial to extraction of the rare earth ions.
【Fund】: 国家自然科学基金资助项目(51404112);; 江西省自然科学基金项目(20151BAB216013)资助
【CateGory Index】: TD865
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