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| Study on the Mechanism of Phase Transformation in the Preparation of Porous Glass from High-Sulfur Coal Gangue and Fly Ash |
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Received:June 28, 2024
Revised:July 11, 2024
Accepted:July 15, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:high-sulfur coal gangue; incineration fly ash; mullite; phase transformation |
| Author | Institution |
| XU Chen-yang |
China University of Mining Technology,Beijing |
| LONG Meng-zhuo |
Key Laboratory of Green Process Engineering,National Engineering Research Center for Green Recycling of Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences |
| CAO Jian-wei |
Key Laboratory of Green Process Engineering,National Engineering Research Center for Green Recycling of Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences |
| WANG Zhi |
Key Laboratory of Green Process Engineering,National Engineering Research Center for Green Recycling of Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences |
| CHANG Ya-li |
Key Laboratory of Green Process Engineering,National Engineering Research Center for Green Recycling of Strategic Metal Resources,Institute of Process Engineering,Chinese Academy of Sciences |
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| Abstract: |
| This study focuses on the preparation of porous glass using high-sulfur coal gangue as the main raw material, in combination with incineration fly ash. The aim is to achieve high-value resource utilization of coal gangue while simultaneously immobilizing heavy metals such as Zn, Pb, Cr, Cu, Mn, and Cd present in incineration fly ash within the glass matrix. This approach facilitates the co-disposal and resource recovery of multiple sources of solid and hazardous waste. To address the challenge of balancing lightweight and2 high-strength properties in porous glass, the study employs two main strategies. Firstly, by creating a weak reducing atmosphere, the residual carbon reacts with Fe2O3 in the coal gangue to generate CO2 gas, which promotes foaming of the molten glass, reducing the bulk density from 900 kg/m3 to 300 kg/m3. Secondly, the addition of kaolin modifies the raw material mix, promoting the formation of mullite with lower Gibbs free energy. This transformation changes the main crystalline phase of the porous glass walls from feldspar to mullite. The interconnected mullite crystals significantly enhance the strength, achieving an 80% increase in strength when the bulk density is 500 kg/m3. |
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