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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