Calcium carbonate synthesis from Kambara reactor desulphurization slag via indirect carbonation for CO2 capture and utilization

Yong Lin; Baijun Yan; Bernhard Mitas; Chenglei Li; Timo Fabritius; Qifeng Shu

doi:10.1016/j.jenvman.2023.119773

Calcium carbonate synthesis from Kambara reactor desulphurization slag via indirect carbonation for CO₂ capture and utilization

J Environ Manage. 2024 Feb:351:119773. doi: 10.1016/j.jenvman.2023.119773. Epub 2023 Dec 19.

Authors

Yong Lin¹, Baijun Yan², Bernhard Mitas³, Chenglei Li⁴, Timo Fabritius⁵, Qifeng Shu⁶

Affiliations

¹ Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341119, China; Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341119, China; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China. Electronic address: ylin@gia.cas.cn.
² School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China. Electronic address: baijunyan@ustb.edu.cn.
³ Ferrous Metallurgy, Montanuniversitaet Leoben, Leoben, 8700, Austria. Electronic address: bmitas@gmail.com.
⁴ Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341119, China. Electronic address: clli21@gia.cas.cn.
⁵ Process Metallurgy Research Unit, University of Oulu, Oulu, FI-90014, Finland. Electronic address: timo.fabritius@oulu.fi.
⁶ Process Metallurgy Research Unit, University of Oulu, Oulu, FI-90014, Finland. Electronic address: qifeng.shu@oulu.fi.

PMID: 38113789
DOI: 10.1016/j.jenvman.2023.119773

Abstract

In this work, industrial Kambara reactor desulphurization slag (KR slag) was indirectly carbonated. The effects of leaching time, leaching temperature, leaching agent types, and leaching agent concentration on the leaching ratio of calcium from KR slag were investigated. Subsequently, precipitated calcium carbonate (PCC) was synthesized by bubbling CO₂ gas (flow rate of 15 mL/min) into 400 mL leaching solutions at 40 °C for 120 min with magnetic stirring at 300 rpm. It is found that calcium in KR slag can be selectively extracted using a diluted solution of ammonium acetate (CH₃COONH₄) or ammonium chloride (NH₄Cl), while ammonium sulfate ((NH₄)₂SO₄) solution is not suitable as leaching agent due to the formation of slightly soluble calcium sulfate (CaSO₄). The leaching ratio of calcium is improved by extending the leaching time or increasing the leaching solvent concentration. However, leaching temperature has little effect on calcium extraction. After carbonating the NH₄Cl- and CH₃COONH₄-leachate for 120 min, calcite and vaterite type PCC with a purity of 99% is synthesized. Each gram of KR slag can produce 0.794 g and 0.803 g PCC using NH₄Cl and CH₃COONH₄ leaching agents respectively. Calculations show that 349.6 kg CO₂ is captured by per ton of KR slag. The CO₂ capture capacity of KR slag is significantly higher compared with previously studied materials.

Keywords: CO(2) capture; Kambara reactor desulphurization slag; Precipitated calcium carbonate; Slag valorization; Waste management.

MeSH terms

Calcium
Calcium Carbonate*
Carbon Dioxide*
Carbonates
Industrial Waste / analysis
Steel

Substances

Calcium Carbonate
Carbon Dioxide
Industrial Waste
Calcium
Carbonates
Steel