Simultaneous CO2 mineral sequestration and rutile beneficiation by using titanium-bearing blast furnace slag: Process description and optimization

被引：31

作者：

He, Minyu ^{[1
]}

Teng, Liumei ^{[1
,2
]}

Gao, Yuxiang ^{[1
]}

Rohani, Sohrab ^{[3
]}

Ren, Shan ^{[1
]}

Li, Jiangling ^{[1
]}

Yang, Jian ^{[1
]}

Liu, Qingcai ^{[1
]}

Liu, Weizao ^{[1
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Chongqing Univ Arts & Sci, Sch Mat Sci & Engn, Chongqing 402160, Peoples R China

[3] Western Univ, Dept Chem & Biochem Engn, 1510 Richmond St, London, ON N6A 5B9, Canada

来源：

ENERGY | 2022年 / 248卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Titanium-bearing blast furnace slag; Ferrous sulfate; CO2; mineralization; Rutile; Value-added product; SYNTHETIC RUTILE; CARBONATION; SULFATE; TI; RECOVERY; ACID; EXTRACTION; KINETICS; CATIO3; IRON;

D O I：

10.1016/j.energy.2022.123643

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

CO2 mineral sequestration is a promising method for abating global warming. Mineral carbonation with titanium-bearing blast furnace slag (TBFS) can offer a sustainable option for simultaneous CO2 emission reduction and comprehensive utilization of solid waste. In this study, a novel process combining CO2 mineral sequestration and rutile beneficiation was proposed by using TBFS and copperas as feedstocks. TBFS and copperas were roasted at 550-750 degrees C to convert the calcium and magnesium into the corresponding sulfates, while titanium in the TBFS was beneficiated to rutile. The roasted slag was then subjected to carbonation followed by recovery of rutile and hematite through flotation and magnetic separation, respectively. The effects of process parameters were studied systematically. It was found that addition of Na2SO4 significantly enhanced the conversion efficiency of Ti (from 53% to 98%). The mechanism revealed that the addition of Na2SO4 promoted the formation of molten Na3Fe(SO4)(3), and gas-liquid-solid reactions proceeded much faster and efficiently. The carbonation of sulfated TBFS results indicated that the optimal CO2 storage capacity can reach 187 kg t(-1) TBFS. In this process, two solid wastes were utilized for CO2 mineralization, realizing the multiple benefits of CO2 emission reduction, solid waste disposal as well as valuable byproducts recovery. (C) 2022 Elsevier Ltd. All rights reserved.

引用

页数：11

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