Mechanism of desulfurization pretreatment of barium-containing waste slag by calcium carbonate precipitation method

YANG Dan; LI Chen; WU Hanzhang; PENG Jiyi; GONG Zihao; YU Zhiyuan

doi:10.13205/j.hjgc.202606016

Volume 44 Issue 6

Jun. 2026

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2026 > 44(6): 158-165

YANG Dan, LI Chen, WU Hanzhang, PENG Jiyi, GONG Zihao, YU Zhiyuan. Mechanism of desulfurization pretreatment of barium-containing waste slag by calcium carbonate precipitation method[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 158-165. doi: 10.13205/j.hjgc.202606016

Citation:

YANG Dan, LI Chen, WU Hanzhang, PENG Jiyi, GONG Zihao, YU Zhiyuan. Mechanism of desulfurization pretreatment of barium-containing waste slag by calcium carbonate precipitation method[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 158-165. doi: 10.13205/j.hjgc.202606016

Citation:

YANG Dan, LI Chen, WU Hanzhang, PENG Jiyi, GONG Zihao, YU Zhiyuan. Mechanism of desulfurization pretreatment of barium-containing waste slag by calcium carbonate precipitation method[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 158-165. doi: 10.13205/j.hjgc.202606016

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Mechanism of desulfurization pretreatment of barium-containing waste slag by calcium carbonate precipitation method

doi: 10.13205/j.hjgc.202606016

Engineering Technology Center for Pollution Control of the Nonferrous Metal Industry, Ministry of Ecology and Environment, Hunan Research Academy of Environmental Sciences, Changsha 410004, China

Received Date: 2025-09-30
Accepted Date: 2025-10-25
Rev Recd Date: 2025-10-19

Available Online: 2026-07-06

Abstract

Abstract

To address the challenges of high sulfur content and difficult deep desulfurization of barium slag， this study employed sodium carbonate as the desulfurization agent. The effects of reaction temperature， reaction time， and sodium carbonate concentration on the desulfurization performance were systematically investigated. The phase transformation and microstructure evolution during the desulfurization process were characterized using XRD and SEM-EDS， and the corresponding reaction mechanism and limiting factors were clarified. The results indicated that the desulfurization of barium-containing waste slag primarily relied on the reaction between ettringite and sodium carbonate in solution， which formed calcium carbonate precipitates to remove sulfur. However， the precipitated calcium carbonate gradually accumulated on the surface of ettringite， hindering further progress of the desulfurization reaction. Under the optimal conditions of 60 °C， 5 h， and 2 mol/L Na₂CO₃， the desulfurization efficiency reached 91.21%， and the sulfur content of slag was reduced to 0.27%， meeting the standards for co-processing in cement kilns.
- barium slag,
- ettringite,
- sodium carbonate,
- desulfurization

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References(33)

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