Extraction of scandium from red mud by acid leaching with CaF2 and solvent extraction with P507  

作　　者：Xiaobo Zhu Wang Li Baolin Xing Yude Zhang 

机构地区：[1]College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《Journal of Rare Earths》2020年第9期1003-1008,I0004,共7页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51804103,51904097);Fundamental Research Funds for the Universities of Henan Province(NSFRF180319);the Scientific and Technological Project of Henan Province(172102310679,182102310846)。

摘　　要：The extraction of Sc by acid leaching with CaF2 and solvent extraction with P507 from red mud was proposed.The influence of acid leaching and solvent extraction on recovery of Sc was investigated.The CaF2 can obviously improve the leaching efficiency of Sc and reduce the acid consumption.The leaching efficiency of Sc increases from 74%to 92%and the dosage of acid reduces under suitable conditions by adding 5%CaF2.The minerals in red mud can easily be decomposed and leached into the acid solution with CaF2 through analysis of XRD pattern.The particles of red mud become smaller and multihole.The Sc can be selectively extracted with 10%P507 at the pH value of 0.1 from the acid leaching solution.More than 98%of Sc and less than 10%of Al and Fe are extracted.The SC2O3 with purity of 99%is obtained after the process of reverse extraction with NaOH,H2SO4 dissolution,precipitation by oxalic acid and roasting at 750℃.

关 键 词：SC CAF2 Acid leaching Solvent extraction Red mud Rare earths 

分 类 号：X758[环境科学与工程—环境工程] TF845.1[冶金工程—有色金属冶金]