Preparation of Sm2O3 and Co3O4 from SmCo magnet swarf by hydrometallurgical processing in chloride media

作     者：K.Sahoo A.K.Nayak M.K.Ghosh K.Sarangi 

作者机构：CSIR-Institute of Minerals and Materials TechnologyBhubaneswar-751013OdishaIndia 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2018年第36卷第7期

页      面：725-732页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by Sustainable Technologies for the Utilisation of Rare Earths(SURE) CSC-0132 supported by CSIR India 

主　　题：SmCo magnet Samarium Cobalt TOPS-99 Solvent extraction Precipitation stripping 

摘      要：The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-Co based permanent magnet generated during machining is a good source for both Sm and Co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. Stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. Co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.