SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2025, Vol. 80 ›› Issue (4): 24-37.DOI: 10.1016/j.cjche.2024.12.010

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Comprehensive utilization of titanium-bearing blast furnace slag by H2SO4 roasting and stepwise precipitation

Siwen Huang1, Kui Wang2, Haibo Wang1,3, Li Lv1, Tao Zhang1, Wenxiang Tang1, Zongpeng Zou1, Shengwei Tang1   

  1. 1 MOE's Engineering Research Center for Comprehensive Utilization and Clean Process of Phosphorous Resources, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2 Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610399, China;
    3 State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
  • Received:2024-09-26 Revised:2024-12-10 Accepted:2024-12-22 Online:2025-03-05 Published:2025-04-28
  • Contact: Zongpeng Zou,E-mail:zou.zp@scu.edu.cn;Shengwei Tang,E-mail:tangdynasty@scu.edu.cn
  • Supported by:
    The authors are also grateful for the support from the Fundamental Research Funds for the Central Universities (SCU2024D009).

Comprehensive utilization of titanium-bearing blast furnace slag by H2SO4 roasting and stepwise precipitation

Siwen Huang1, Kui Wang2, Haibo Wang1,3, Li Lv1, Tao Zhang1, Wenxiang Tang1, Zongpeng Zou1, Shengwei Tang1   

  1. 1 MOE's Engineering Research Center for Comprehensive Utilization and Clean Process of Phosphorous Resources, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    2 Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610399, China;
    3 State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
  • 通讯作者: Zongpeng Zou,E-mail:zou.zp@scu.edu.cn;Shengwei Tang,E-mail:tangdynasty@scu.edu.cn
  • 基金资助:
    The authors are also grateful for the support from the Fundamental Research Funds for the Central Universities (SCU2024D009).

Abstract: Titanium-bearing blast furnace slag (Ti-BFS) is an industrial solid waste rich in titanium, magnesium and aluminum. However, it is difficult to utilize Ti, Mg and Al from Ti-BFS for the strong stability and poor reaction activity of Ti-BFS. A comprehensive utilization route of Ti, Mg and Al from Ti-BFS was proposed. Ti-BFS was firstly roasted with H2SO4 to realizes the conversion of Ti, Mg and Al to their corresponding sulphates. The sulphates were leached by dilute H2SO4 solution to extraction Ti, Mg and Al from roasted Ti-BFS. The roasting conditions were optimized as follows, sulfuric acid concentration of 85% (mass), temperature of 200 ℃, acid-slag ratio of 5.5, particle size of Ti-BFS <75 μm, and reaction time of 1 h. The extraction rates of titanium, aluminum, and magnesium reached 82.42%, 88.78% and 90.53%, respectively. The leachate was hydrolyzed at 102 ℃ for 5 h with a titanium hydrolysis ratio of 96%. After filtration and calcination, TiO2 with a purity of 97% (mass) was obtained. Al in the leachate was converted to NH4Al(SO4)2·12H2O by the neutralization of ammonia water at pH = 4.5. Al2O3 was obtained by the calcination of NH4Al(SO4)2·12H2O. The residual solution can be used to prepare products of magnesium sulfate. In the proposed process, Ti, Mg and Al were extracted from Ti-BFS and utilized comprehensively to prepare valuable products. The leaching behavior of roasted Ti-BFS with water was also studied. It followed the unreacted shrinking core model. The apparent activation energy was 26.07 kJ·mol-1. This research not only provides a viable method for recovering valuable metals in Ti-BFS, but also provides a strategy to comprehensive utilize the valuable elements in Ti-BFS.

Key words: Titanium-bearing blast furnace slag, Sulfuric acid, Roasting, Precipitation, Kinetics, Waste treatment

摘要: Titanium-bearing blast furnace slag (Ti-BFS) is an industrial solid waste rich in titanium, magnesium and aluminum. However, it is difficult to utilize Ti, Mg and Al from Ti-BFS for the strong stability and poor reaction activity of Ti-BFS. A comprehensive utilization route of Ti, Mg and Al from Ti-BFS was proposed. Ti-BFS was firstly roasted with H2SO4 to realizes the conversion of Ti, Mg and Al to their corresponding sulphates. The sulphates were leached by dilute H2SO4 solution to extraction Ti, Mg and Al from roasted Ti-BFS. The roasting conditions were optimized as follows, sulfuric acid concentration of 85% (mass), temperature of 200 ℃, acid-slag ratio of 5.5, particle size of Ti-BFS <75 μm, and reaction time of 1 h. The extraction rates of titanium, aluminum, and magnesium reached 82.42%, 88.78% and 90.53%, respectively. The leachate was hydrolyzed at 102 ℃ for 5 h with a titanium hydrolysis ratio of 96%. After filtration and calcination, TiO2 with a purity of 97% (mass) was obtained. Al in the leachate was converted to NH4Al(SO4)2·12H2O by the neutralization of ammonia water at pH = 4.5. Al2O3 was obtained by the calcination of NH4Al(SO4)2·12H2O. The residual solution can be used to prepare products of magnesium sulfate. In the proposed process, Ti, Mg and Al were extracted from Ti-BFS and utilized comprehensively to prepare valuable products. The leaching behavior of roasted Ti-BFS with water was also studied. It followed the unreacted shrinking core model. The apparent activation energy was 26.07 kJ·mol-1. This research not only provides a viable method for recovering valuable metals in Ti-BFS, but also provides a strategy to comprehensive utilize the valuable elements in Ti-BFS.

关键词: Titanium-bearing blast furnace slag, Sulfuric acid, Roasting, Precipitation, Kinetics, Waste treatment