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http://dx.doi.org/10.7844/kirr.2020.29.5.48

Titanium Dioxide Recovery from Soda-roasted Spent SCR Catalysts through Sulphuric Acid Leaching and Hydrolysis Precipitation  

Kim, Seunghyun (Dept. of Energy & Resources Engineering, Kangwon National University)
Trinh, Ha Bich (Dept. of Energy & Resources Engineering, Kangwon National University)
Lee, Jaeryeong (Dept. of Energy & Resources Engineering, Kangwon National University)
Publication Information
Resources Recycling / v.29, no.5, 2020 , pp. 48-54 More about this Journal
Abstract
Sulphuric acid (H2SO4) leaching and hydrolysis were experimented for the recovery of titanum dioxide (TiO2) from the water-leached residue followed by soda-roasting spent SCR catalysts. Sulphuric acid leaching of Ti was carried out with leachate concentration (4~8 M) and the others were fixed (temp.: 70 ℃, leaching time: 3 hrs, slurry density: 100 g/L, stirring speed: 500 rpm). For recovering of Ti from the leaching solution, hydrolysis precipitation was conducted at 100 ℃ for 2 hours in various mixing ratio (leached solution:distilled water) of 1:9 to 5:5. The maximum leachability was reached to 95.2 % in 6 M H2SO4 leachate. on the other hand, the leachability of Si decreased dramatically 91.7 to 3.0 % with an increase of H2SO4 concentration. Hydrolysis precipitation of Ti was proceeded with leaching solution of 8 M H2SO4 with the lowest content of Si. The yield of precipitation increased proportionally with a dilution ratio of leaching solution. Moreover, it increased generally by adding 0.2 g TiO2 as a precipitation seed to the diluted leaching solution. Ultimately, 99.8 % of TiO2 can be recovered with the purity of 99.46 % from the 1:9 diluted solution.
Keywords
Spent SCR catalyst; soda-roasted; titanum dioxide; sulphuric acid leaching; hydrolysis precipitation;
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Times Cited By KSCI : 1  (Citation Analysis)
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