Recovery of TiO₂ from spent SCR catalyst by acidolysis and additional crystal seeds-hydrolysis method

Bo Wang; Zhongnan Li; Hangkai Liu; Libin Tian; Qiaowen Yang; Ruoyan Bai; Yue Chen; Xu Liu

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자료유형: 학술저널

저자정보: Bo Wang (China University of Mining and Technology-Beijing) Zhongnan Li (China University of Mining and Technology-Beijing) Hangkai Liu (China University of Mining and Technology-Beijing) Libin Tian (China University of Mining and Technology-Beijing) Qiaowen Yang (China University of Mining and Technology-Beijing) Ruoyan Bai (China University of Mining and Technology-Beijing) Yue Chen (China University of Mining and Technology-Beijing) Xu Liu (Taiyuan University of Technology)

저널정보: 대한환경공학회 Environmental Engineering Research Environmental Engineering Research 제28권 제6호

발행연도: 2023.12

수록면: 60 - 71 (12page)

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In this study, a rapid and efficient method of recovering TiO₂ from spent SCR (selective catalytic reduction) catalyst supplied by a coal-fired power plant in Shanghai was developed. The acid leaching and sodium roasting-water leaching residues (titanium slag) from spent SCR catalyst were employed as the raw material. First, titanium slag was dissolved into H₂SO₄ solution under different conditions. The optimal acidolysis conditions were 85 wt% H₂SO₄, 5.0 g/g acid-residues ratio, 90℃ acidolysis temperature and 2.0 h acidolysis time. Simultaneously, the highest acidolysis efficiency can reach 92.02%. The acidolysis solution was collected and concentrated to 200 g/L (measured by TiO₂ concentration). Then, acidolysis solution was adjusted to pH 0.52-9.15, followed by adding 0-40 mL additional crystal seeds and reacting under certain conditions to obtain the hydrolysis product. The optimal hydrolysis conditions were 25 mL additional crystal seeds, pH 7.46, 120℃ hydrolysis temperature and 3.0 h hydrolysis time. Finally, the recovered product was obtained by roasting hydrolysis product at 700℃ for 2.0 h. The results of hydrolysis stability test indicated that this method can make the hydrolysis efficiency of acidolysis solution stabilize at approximately 90% under optimal conditions. The main component of recovered product was anatase TiO₂ with the purity of 86.88%.

#Acidolysis #Additional crystal seeds-hydrolysis #Recovery of TiO2 #Spent SCR catalyst #Titanium slag

참고문헌 (33)

참고문헌 신청

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