Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO2 and Al2O3

Lin Wang; Weizao Liu; Jingpeng Hu; Qiang Liu; Hairong Yue; Bin Liang; Guoquan Zhang; Dongmei Luo; Heping Xie; Chun Li

doi:10.1016/j.cjche.2017.06.012

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Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃

Energy, Resources and Environmental Technology | Updated：2026-01-06

- Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃
- Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃
- 中国化学工程学报（英文版） 2018年26卷第3期页码：583-592
- Affiliations：
  
  College of Chemical Engineering, Sichuan University,Chengdu,China,610065
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.06.012
  中图分类号：
- 纸质出版：2018
- Accepted：
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Lin Wang, Weizao Liu, Jingpeng Hu, 等. Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃[J]. 中国化学工程学报（英文版）, 2018,26(3):583-592. DOI: 10.1016/j.cjche.2017.06.012.

and Al
Lin Wang, Weizao Liu, Jingpeng Hu, 等. Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃[J]. 中国化学工程学报（英文版）, 2018,26(3):583-592. DOI: 10.1016/j.cjche.2017.06.012. DOI：

and Al DOI： 10.1016/j.cjche.2017.06.012.

摘要

Abstract

Large quantities of CO

and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO

emission reduction and comprehensive utilization of the solid waste. This paper describes a novel route for indirect mineral carbonation of titanium-bearing blast furnace (TBBF) slag

in which the TBBF slag is roasted with recyclable (NH

)

(AS) at low temperatures and converted into the sulphates of various valuable metals

including calcium

magnesium

aluminium and titanium. High value added Ti-and Al-rich products can be obtained through stepwise precipitation of the leaching solution from the roasted slag. The NH

produced during the roasting is used to capture CO

from flue gases. The NH

HCO

and (NH

)

thus obtained are used to carbonate the CaSO

-containing leaching residue and MgSO

-rich leaching solution

respectively. In this study

the process parameters and efficiency for the roasting

carbonation

and Ti and Al recovery were investigated in detail. The results showed that the sulfation ratios of calcium

magnesium

titanium and aluminium reached 92.6%

87% and 84.4%

respectively

after roasting at an AS-to-TBBF slag mass ratio of 2:1 and 350℃ for 2 h. The leaching solution was subjected to hydrolysis at 102℃ for 4 h with a Ti hydrolysis ratio of 95.7%and the purity of TiO

in the calcined hydrolysate reached 98 wt%. 99.7% of aluminium in the Ti-depleted leaching solution was precipitated by using NH

. The carbonation products of Ca and Mg were CaCO

and (NH

)

Mg(CO

)

·4H

respectively. The latter can be decomposed into MgCO

at 100-200℃ with simultaneous recovery of the NH

for reuse. In this process

approximately 82.1% of Ca and 84.2% of Mg in the TBBF slag were transformed into stable carbonates and the total CO

sequestration capacity per ton of TBBF slag reached up to 239.7 kg. The TiO

obtained can be used directly as an end product

while the Al-rich precipitate and the two carbonation products can act

respectively

as raw materials for electrolytic aluminium

cement and light magnesium carbonate production for the replacement of natural resources.

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