Separation and recovery of rare earth from waste nickel-metal hydride batteries by phosphate based extraction-precipitation  

作　　者：Hailan Zhi Shuainan Ni Xiang Su Wenqi Xie Hepeng Zhang Xiaoqi Sun 

机构地区：[1]College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China [2]Fujian CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [3]Fujian Research Center for RE Engineering Technology,Xiamen Institute of RE Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen 36102J,China [4]Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,China [5]Ganzhou Rare Earth Group Co.,Ltd.,China Southern Rare Earth,Ganzhou 341000,China

出　　处：《Journal of Rare Earths》2022年第6期974-980,I0005,共8页稀土学报（英文版）

基　　金：Project supported by National Key R&D Program of China(2017YFE0106900);Key R&D Program of Jiangxi Province(S2020ZPYFG0029);Key Program of the Chinese Academy of Sciences(ZDRW-CN-2021-3-1-13)。

摘　　要：A novel type of extraction-precipitation strategy based on phosphate was developed to recover rare earth(RE,i.e.,La,Ce,Nd,and Pr)from waste nickel-metal hydride(NiMH)batteries.This method does not require saponification and organic solvents.The novel phosphates,i.e.,dibenzyl phosphate(DBP),diphenyl phosphate(DPP),triphenyl phosphate(TPP)were studied as extraction-precipitants.DBP has high precipitation efficiencies for RE^(3+),which can reach 97.84%,100%,100%and 99.77%,respectively.In addition,the precipitation efficiencies of Mn^(2+),Co^(2+)and Ni^(2+)are less than 1.75%.DBP-RE has the largest particle size(D10=52.6μm,D50=135.35μm,D90=296.08μm),which is much larger than the precipitations formed by NH_(4)HCO_(3),H_(2)C2O_(4),CaO and MgO.The larger precipitation particle sizes contribute to improving the solid-liquid separation efficiency.With 3 mol/L hydrochloric acid,the stripping efficiency of DBP-RE reaches 98.60%,and the purity of recovered RE is 99.85%.The regenerated DBP can be directly used for the recycling extraction.Therefore,the novel extraction-precipitation strategy is a green and sustainable separation method.

关 键 词：Waste nickel-metal hydride battery Rare earth Extraction-precipitation Phosphonic acid(ester) 

分 类 号：TF845[冶金工程—有色金属冶金] X705[环境科学与工程—环境工程]