Simultaneous preparation of TiO2 and ammonium alum, and microporous SiO2 during the mineral carbonation of titanium-bearing blast furnace slag

doi:10.1016/j.cjche.2020.03.020

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (9): 2256-2266.DOI: 10.1016/j.cjche.2020.03.020

• Separation Science and Engineering • Previous Articles Next Articles

Simultaneous preparation of TiO₂ and ammonium alum, and microporous SiO₂ during the mineral carbonation of titanium-bearing blast furnace slag

Yingjie Xiong¹, Tahani Aldahri^2,3, Weizao Liu^1,2, Guanrun Chu¹, Guoquan Zhang¹, Dongmei Luo¹, Hairong Yue¹, Bin Liang¹, Chun Li¹

1 School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 Department of Chemical and Biochemical Engineering, Western University, London, Ontario, Canada;
3 Department of physics, Taibah University, Madinah, Saudi Arabia

Received:2019-12-26 Revised:2020-03-08 Online:2020-10-21 Published:2020-09-28
Contact: Dongmei Luo, Chun Li
Supported by:
The authors are grateful for the financial support of the National Key Projects for Fundamental Research and Development of China (2016YFB0600904), Sichuan University Postdoctoral Research and Development Fund (2017SCU12017), Project of State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization (18H0083), Sichuan Science and Technology Department Project (2019YJ0111). We also appreciate Hui Wang, Xi Wu and Guanglei Cheng from the Analytical & Testing Center of Sichuan University for their help with SEM and ICP characterization.

Simultaneous preparation of TiO₂ and ammonium alum, and microporous SiO₂ during the mineral carbonation of titanium-bearing blast furnace slag

Yingjie Xiong¹, Tahani Aldahri^2,3, Weizao Liu^1,2, Guanrun Chu¹, Guoquan Zhang¹, Dongmei Luo¹, Hairong Yue¹, Bin Liang¹, Chun Li¹

1 School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2 Department of Chemical and Biochemical Engineering, Western University, London, Ontario, Canada;
3 Department of physics, Taibah University, Madinah, Saudi Arabia

通讯作者: Dongmei Luo, Chun Li
基金资助:
The authors are grateful for the financial support of the National Key Projects for Fundamental Research and Development of China (2016YFB0600904), Sichuan University Postdoctoral Research and Development Fund (2017SCU12017), Project of State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization (18H0083), Sichuan Science and Technology Department Project (2019YJ0111). We also appreciate Hui Wang, Xi Wu and Guanglei Cheng from the Analytical & Testing Center of Sichuan University for their help with SEM and ICP characterization.

Abstract

Abstract: In this study, a route for simultaneous mineralization of CO₂ and production of titanium dioxide and ammonium alum, and microporous silicon dioxide from titanium-bearing blast furnace slag (TBBF slag) was proposed, which is comprised of (NH₄)₂SO₄ roasting, acid leaching, ammonium alum crystallization, silicic acid flocculation and Ti hydrolysis. The effects of relevant process parameters were systematically investigated. The results showed that under the optimal roasting and leaching conditions about 85% of titanium and 84.6% of aluminum could be extracted while only 30% of silicon entered the leachate. 84% of Al³⁺ was crystallized from the leachate in the form of ammonium aluminum sulfate dodecahydrate with a purity up to 99.5 wt%. About 85% of the soluble silicic acid was flocculated with the aid of secondary alcohol polyoxyethylene ether 9 (AEO-9) to yield a microporous SiO₂ material (97.4 wt%) from the crystallized mother liquor. The Al- and Si-depleted solution was then hydrolyzed to generate a titanium dioxide (99.1 wt%) with uniform particle size distribution. It was figured out that approximately 146 kg TiO₂ could be produced from 1000 kg of TBBF slag. Therefore, the improved process is a promising method for industrial application.

Key words: CO₂ mineralization, Titanium-bearing blast furnace slag, Ammonium sulfate, Flocculation, Titanium dioxide

摘要： In this study, a route for simultaneous mineralization of CO₂ and production of titanium dioxide and ammonium alum, and microporous silicon dioxide from titanium-bearing blast furnace slag (TBBF slag) was proposed, which is comprised of (NH₄)₂SO₄ roasting, acid leaching, ammonium alum crystallization, silicic acid flocculation and Ti hydrolysis. The effects of relevant process parameters were systematically investigated. The results showed that under the optimal roasting and leaching conditions about 85% of titanium and 84.6% of aluminum could be extracted while only 30% of silicon entered the leachate. 84% of Al³⁺ was crystallized from the leachate in the form of ammonium aluminum sulfate dodecahydrate with a purity up to 99.5 wt%. About 85% of the soluble silicic acid was flocculated with the aid of secondary alcohol polyoxyethylene ether 9 (AEO-9) to yield a microporous SiO₂ material (97.4 wt%) from the crystallized mother liquor. The Al- and Si-depleted solution was then hydrolyzed to generate a titanium dioxide (99.1 wt%) with uniform particle size distribution. It was figured out that approximately 146 kg TiO₂ could be produced from 1000 kg of TBBF slag. Therefore, the improved process is a promising method for industrial application.

关键词: CO₂ mineralization, Titanium-bearing blast furnace slag, Ammonium sulfate, Flocculation, Titanium dioxide

Yingjie Xiong, Tahani Aldahri, Weizao Liu, Guanrun Chu, Guoquan Zhang, Dongmei Luo, Hairong Yue, Bin Liang, Chun Li. Simultaneous preparation of TiO₂ and ammonium alum, and microporous SiO₂ during the mineral carbonation of titanium-bearing blast furnace slag[J]. Chinese Journal of Chemical Engineering, 2020, 28(9): 2256-2266.

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Simultaneous preparation of TiO₂ and ammonium alum, and microporous SiO₂ during the mineral carbonation of titanium-bearing blast furnace slag

Simultaneous preparation of TiO₂ and ammonium alum, and microporous SiO₂ during the mineral carbonation of titanium-bearing blast furnace slag

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