Calcium recovery from waste carbide slag via ammonium sulfate leaching system

Wenxiu Li; Tao Wang; Yuhang Yang; Mengxiang Fang; Xiang Gao

doi:10.1016/j.jclepro.2022.134308

Calcium recovery from waste carbide slag via ammonium sulfate leaching system

Wenxiu Li
, Tao Wang^*
, Yuhang Yang
, Mengxiang Fang
, Xiang Gao

^*Corresponding author for this work

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

20 Scopus citations

Abstract

Waste carbide slag (WCS) is a typical industrial solid waste with high calcium content, which shows highly potential in preparation of CaCO₃ by CO₂ mineralization technology. This study demonstrated the feasibility of efficient calcium leaching from WCS using ammonium sulfate ((NH₄)₂SO₄) under mild conditions (≤40 °C，0.1 MPa). Nearly 90% calcium was converted into calcium sulfate dihydrate (CaSO₄·2H₂O) in about 15 min, and after impurity separation the CaSO₄·2H₂O with about 90% whiteness and 94% purity was effectively collected. In addition, a surface coverage kinetics model suitable for this leaching system was proposed. It was found that, kinetics behavior followed the chemical reaction control mechanism within the first minutes and then switched to the product islands diffusion-control along with CaSO₄·2H₂O crystallization. Accordingly, calcium leaching in (NH₄)₂SO₄ system could be reinforced by readjusting S/L after reaching equilibrium. This process provides a potential path for the resource treatment of industrial solid wastes such as calcium carbide slag and desulfurization gypsum.

Original language	English
Article number	134308
Journal	Journal of Cleaner Production
Volume	377
DOIs	https://doi.org/10.1016/j.jclepro.2022.134308
State	Published - 1 Dec 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022

Keywords

(NH)SO medium
Leaching kinetics
Surface coverage model
Waste carbide slag

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Environmental Science
Strategy and Management
Industrial and Manufacturing Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jclepro.2022.134308

Cite this

@article{2237667dda10459ca72f331d8b00bb25,

title = "Calcium recovery from waste carbide slag via ammonium sulfate leaching system",

abstract = "Waste carbide slag (WCS) is a typical industrial solid waste with high calcium content, which shows highly potential in preparation of CaCO3 by CO2 mineralization technology. This study demonstrated the feasibility of efficient calcium leaching from WCS using ammonium sulfate ((NH4)2SO4) under mild conditions (≤40 °C，0.1 MPa). Nearly 90\% calcium was converted into calcium sulfate dihydrate (CaSO4·2H2O) in about 15 min, and after impurity separation the CaSO4·2H2O with about 90\% whiteness and 94\% purity was effectively collected. In addition, a surface coverage kinetics model suitable for this leaching system was proposed. It was found that, kinetics behavior followed the chemical reaction control mechanism within the first minutes and then switched to the product islands diffusion-control along with CaSO4·2H2O crystallization. Accordingly, calcium leaching in (NH4)2SO4 system could be reinforced by readjusting S/L after reaching equilibrium. This process provides a potential path for the resource treatment of industrial solid wastes such as calcium carbide slag and desulfurization gypsum.",

keywords = "(NH)SO medium, Leaching kinetics, Surface coverage model, Waste carbide slag",

author = "Wenxiu Li and Tao Wang and Yuhang Yang and Mengxiang Fang and Xiang Gao",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = dec,

day = "1",

doi = "10.1016/j.jclepro.2022.134308",

language = "English",

volume = "377",

journal = "Journal of Cleaner Production",

issn = "0959-6526",

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TY - JOUR

T1 - Calcium recovery from waste carbide slag via ammonium sulfate leaching system

AU - Li, Wenxiu

AU - Wang, Tao

AU - Yang, Yuhang

AU - Fang, Mengxiang

AU - Gao, Xiang

PY - 2022/12/1

Y1 - 2022/12/1

N2 - Waste carbide slag (WCS) is a typical industrial solid waste with high calcium content, which shows highly potential in preparation of CaCO3 by CO2 mineralization technology. This study demonstrated the feasibility of efficient calcium leaching from WCS using ammonium sulfate ((NH4)2SO4) under mild conditions (≤40 °C，0.1 MPa). Nearly 90% calcium was converted into calcium sulfate dihydrate (CaSO4·2H2O) in about 15 min, and after impurity separation the CaSO4·2H2O with about 90% whiteness and 94% purity was effectively collected. In addition, a surface coverage kinetics model suitable for this leaching system was proposed. It was found that, kinetics behavior followed the chemical reaction control mechanism within the first minutes and then switched to the product islands diffusion-control along with CaSO4·2H2O crystallization. Accordingly, calcium leaching in (NH4)2SO4 system could be reinforced by readjusting S/L after reaching equilibrium. This process provides a potential path for the resource treatment of industrial solid wastes such as calcium carbide slag and desulfurization gypsum.

AB - Waste carbide slag (WCS) is a typical industrial solid waste with high calcium content, which shows highly potential in preparation of CaCO3 by CO2 mineralization technology. This study demonstrated the feasibility of efficient calcium leaching from WCS using ammonium sulfate ((NH4)2SO4) under mild conditions (≤40 °C，0.1 MPa). Nearly 90% calcium was converted into calcium sulfate dihydrate (CaSO4·2H2O) in about 15 min, and after impurity separation the CaSO4·2H2O with about 90% whiteness and 94% purity was effectively collected. In addition, a surface coverage kinetics model suitable for this leaching system was proposed. It was found that, kinetics behavior followed the chemical reaction control mechanism within the first minutes and then switched to the product islands diffusion-control along with CaSO4·2H2O crystallization. Accordingly, calcium leaching in (NH4)2SO4 system could be reinforced by readjusting S/L after reaching equilibrium. This process provides a potential path for the resource treatment of industrial solid wastes such as calcium carbide slag and desulfurization gypsum.

KW - (NH)SO medium

KW - Leaching kinetics

KW - Surface coverage model

KW - Waste carbide slag

UR - https://www.scopus.com/pages/publications/85139339015

U2 - 10.1016/j.jclepro.2022.134308

DO - 10.1016/j.jclepro.2022.134308

M3 - Article

AN - SCOPUS:85139339015

SN - 0959-6526

VL - 377

JO - Journal of Cleaner Production

JF - Journal of Cleaner Production

M1 - 134308

ER -

Calcium recovery from waste carbide slag via ammonium sulfate leaching system

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

Access to Document

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Cite this