Purification of scandium from concentrate generated from titanium pigments production waste  

作　　者：Jie Zhou Shunyan Ning Jiejie Meng Shichang Zhang Wei Zhang Siyi Wang Yedan Chen Xinpeng Wang Yuezhou Wei 

机构地区：[1]Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China [2]School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Rare Earths》2021年第2期194-200,共7页稀土学报（英文版）

基　　金：the National Natural Science Foundation of China(11705032,11675102);Natural Science Foundation of Guangxi Province(2017GXNSFBA198175);Science and Technology Major Project of Guangxi Province(AA17204100)。

摘　　要：Nowadays 80%of scandium in China is obtained from titanium pigments production waste through a complex purification process.The study mainly focused on the purification of Sc from its concentrate generated from titanium pigments production waste by solvent extraction.Several extractants have been tried and 10%D_(2)EHPA-5%TBP-85%sulfonated kerosene exhibited the best extraction performance towards Sc in 7 mol/L H_(2)SO_(4)solution,so it was selected as the oil phase.0.5%of H_(2)O_(2)was added into the concentrated solution which can effectively inhibit the extraction of Ti.Both the extraction and back extraction parameters are optimized.The preferred extraction conditions were obtained,i.e.,acidity:7 mol/L H_(2)SO_(4),the phase ratio A/O:10,room temperature,mixed contact time:30 min,Sc concentrate:10 g/L,that the extraction rate of Sc in the above conditions was nearly 100%.NaOH was used for back extraction with the stripping rate 99%on the following conditions:5 mol/L NaOH stripping for 30 min at a phase ratio A/O:1 at 90℃.Finally,H_(2)C_(2)O_(4)was used to further purify the back extraction product and Sc_(2)(C_(2)O_(4))_(3)precipitant fo rmed.The final product Sc_(2)O_(3)with a purity over 99.5%was obtained by calcining Sc_(2)(C_(2)O_(4))_(3)at 1000℃for 2 h.A conceptual process for Sc purification was put forward and proved.The total recovery yield of Sc in the whole process is 95%.

关 键 词：SCANDIUM D_(2)EHPA TBP Extraction PURIFICATION Titanium pigments production waste 

分 类 号：TF845.1[冶金工程—有色金属冶金] X788[环境科学与工程—环境工程]