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Preparation, characterization, and application of an eco-friendly sand-fixing material largely utilizing coal-based
Dandan Peng1, Yaguang Wang1, Xiaoming Liu1
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Journal of Hazardous Materials
|March 30, 2019
Summary
This study developed a self-degradable sand-fixing material (SFM) from coal-based solid waste (CBSW) and aeolian sand. The eco-friendly SFM effectively solidifies heavy metals and improves desert environments.
Area of Science:
- Materials Science
- Environmental Engineering
- Waste Management
Background:
- Coal-based solid waste (CBSW) presents a significant disposal challenge.
- Resource utilization of CBSW is crucial for environmental sustainability.
- Developing eco-friendly materials for desertification control is a global priority.
Purpose of the Study:
- To prepare a self-degradable, eco-friendly sand-fixing material (SFM) using CBSW and aeolian sand.
- To investigate the hydration mechanism and environmental characteristics of the SFM.
- To provide a sustainable solution for CBSW utilization and desert greening.
Main Methods:
- Preparation of SFM based on the intermediate-calcium system principle.
- Characterization of hydration products using XRD, TG-DSC, FTIR, and SEM.
- Evaluation of environmental performance through leaching tests and freeze-thaw cycles.
Main Results:
- SFM achieved a compressive strength of 12.4 MPa after 28 days.
- The material met international standards after 150 freeze-thaw cycles but degraded completely after 200 cycles.
- Leaching tests confirmed solidification of heavy metals, indicating eco-friendly properties before and after degradation.
- Main hydration products included ettringite, C-S-H, and C-A-S-H, crucial for strength and solidification.
Conclusions:
- The developed SFM offers an effective method for utilizing CBSW.
- The SFM demonstrates excellent environmental characteristics, including heavy metal solidification and self-degradability.
- This research contributes to improving desert ecosystems and addressing solid waste management challenges.
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