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Updated: May 28, 2026
11:14
Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Synergistic CO2 Mineralization and Performance Optimization of FA-CS-PG Ternary Solid Waste System
Jiayao Zhang1, Qingping Wang1,2,3, Zhiwei Cheng1
1School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.
Materials (Basel, Switzerland)
|May 27, 2026
Summary
This study developed a synergistic method using fly ash (FA), carbide slag (CS), and phosphogypsum (PG) to manage industrial waste and CO2 emissions. Optimized conditions significantly improved compressive strength and CO2 mineralization efficiency.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Industrial solid waste management and CO2 emission reduction require integrated solutions.
- Single solid waste mineralization (e.g., fly ash, carbide slag) faces performance limitations (low strength, poor carbonation).
- A quantitative understanding of multi-component synergistic interactions is lacking.
Purpose of the Study:
- To investigate the synergistic mineralization mechanism of multi-component industrial solid waste.
- To overcome performance bottlenecks associated with single solid waste mineralization.
- To optimize material composition and processing parameters for enhanced CO2 sequestration and mechanical properties.
Main Methods:
- Response Surface Methodology (RSM) was employed to study interactive effects of waste ratios, water-to-solid ratio, and alkali content.
- Microstructural and spectroscopic analyses (e.g., SEM, XRD) were used to elucidate the mineralization mechanism.
- Optimized conditions were determined for a ternary system of fly ash, carbide slag, and phosphogypsum.
Main Results:
- Optimized conditions (34% CS, 30% PG, water/solid=0.48, alkali=27%) yielded 7-day compressive strength of 3.5 MPa and 16% CO2 mineralization efficiency.
- Carbide slag acts as a calcium source and alkaline activator; fly ash forms an aluminosilicate network via pozzolanic reactions.
- Phosphogypsum's sulfate promotes ettringite formation, enhancing pore filling and early strength development, creating a gradient pore structure.
Conclusions:
- A ternary synergistic mechanism involving fly ash, carbide slag, and phosphogypsum was elucidated.
- The optimized system demonstrates superior performance compared to single solid waste mineralization.
- This research offers a viable pathway for high-performance, waste-based mineralization materials with combined mechanical strength and CO2 sequestration capabilities.
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