Purification of scandium from concentrate generated from titanium pigments production waste
来源期刊：JOURNAL OF RARE EARTHS2021年第2期
论文作者：Jie Zhou Shunyan Ning Jiejie Meng Shichang Zhang Wei Zhang Siyi Wang Yedan Chen Xinpeng Wang Yuezhou Wei
文章页码：194 - 200
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% D2 EHPA-5% TBP-85% sulfonated kerosene exhibited the best extraction performance towards Sc in 7 mol/L H2 SO4 solution,so it was selected as the oil phase.0.5% of H2 O2 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 H2 SO4,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,H2 C2 O4 was used to further purify the back extraction product and Sc2（C2 O4）3 precipitant fo rmed.The final product Sc2 O3 with a purity over 99.5% was obtained by calcining Sc2（C2 O4）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%.
Jie Zhou1，Shunyan Ning1，Jiejie Meng1，Shichang Zhang1，Wei Zhang1，Siyi Wang1，Yedan Chen1，Xinpeng Wang1，Yuezhou Wei1,2
1. Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,School of Resources,Environment and Materials,Guangxi University2. School of Nuclear Science and Engineering,Shanghai Jiao Tong University
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% D2 EHPA-5% TBP-85% sulfonated kerosene exhibited the best extraction performance towards Sc in 7 mol/L H2 SO4 solution,so it was selected as the oil phase.0.5% of H2 O2 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 H2 SO4,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,H2 C2 O4 was used to further purify the back extraction product and Sc2（C2 O4）3 precipitant fo rmed.The final product Sc2 O3 with a purity over 99.5% was obtained by calcining Sc2（C2 O4）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%.
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