SCI和EI收录∣中国化工学会会刊

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 Aldahri2,3, Weizao Liu1,2, Guanrun Chu1, Guoquan Zhang1, Dongmei Luo1, Hairong Yue1, Bin Liang1, Chun Li1   

  1. 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 Aldahri2,3, Weizao Liu1,2, Guanrun Chu1, Guoquan Zhang1, Dongmei Luo1, Hairong Yue1, Bin Liang1, Chun Li1   

  1. 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: 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