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

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

Chair of Ferrous Metallurgy (220)

School of Intelligence Science and Technology
Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341119, China
University of Oulu

Research output: Contribution to journal › Article › Research › peer-review

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.

Original language	English
Number of pages	8
Journal	Journal of environmental management
DOIs	https://doi.org/10.1016/j.jenvman.2023.119773
Publication status	Accepted/In press - 3 Dec 2023

Keywords

Kambara reactor
desulphurization slag
Waste management
Precipitated calcium carbonate
CO2 capture technology
Slag valorization

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Cite this

@article{24f22578423f4aaf84d174cb9e2bed5c,

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

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 = "Kambara reactor, desulphurization slag, Waste management, Precipitated calcium carbonate, CO2 capture technology, Slag valorization",

author = "Yong Lin and Baijun Yan and Bernhard Mitas and Chenglei Li and Timo Fabritius and Qifeng Shu",

year = "2023",

month = dec,

day = "3",

doi = "10.1016/j.jenvman.2023.119773",

language = "English",

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T1 - Calcium carbonate synthesis from Kambara reactor desulphurization slag via indirect carbonation for CO2 capture and utilization

AU - Lin, Yong

AU - Yan, Baijun

AU - Mitas, Bernhard

AU - Li, Chenglei

AU - Fabritius, Timo

AU - Shu, Qifeng

PY - 2023/12/3

Y1 - 2023/12/3

N2 - 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.

AB - 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.

KW - Kambara reactor

KW - desulphurization slag

KW - Waste management

KW - Precipitated calcium carbonate

KW - CO2 capture technology

KW - Slag valorization

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DO - 10.1016/j.jenvman.2023.119773

M3 - Article

SN - 0301-4797

JO - Journal of environmental management

JF - Journal of environmental management

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