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Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill
Jiafeng Li1, Jinsong Huang2, Yali Hu1
1School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Materials (Basel, Switzerland)
|December 23, 2023
Summary
A novel binder using lithium slag, fly ash, and desulfurization gypsum enhances cemented lithium tailings backfill. This LSB binder offers superior mechanical properties and strength compared to traditional cementitious binders for mining waste stabilization.
Area of Science:
- Materials Science
- Geotechnical Engineering
- Environmental Engineering
Background:
- Lithium mica tailings pose environmental challenges.
- Traditional cement binders have limitations for fine tailings stabilization.
Purpose of the Study:
- To investigate a novel binder for cemented lithium tailings backfill.
- To evaluate the performance of a binder composed of ordinary Portland cement, lithium slag, fly ash, and desulfurization gypsum.
Main Methods:
- Uniaxial compressive strength tests
- Microstructural morphology analysis
- Grayscale analysis
- Flowability tests
Main Results:
- An optimal binder ratio (OPC:LS:FA:DG) of 2:1:1:1 was identified.
- LSB-CLTB material showed higher unconfined compressive strength (UCS) and lower self-weight than OPC-CLTB.
- At 10 wt% binder, LSB-CLTB achieved 40.6% (7-day), 34.5% (14-day), and 44.8% (28-day) higher UCS than OPC-based materials.
Conclusions:
- The LSB binder exhibits superior mechanical properties and enhanced pozzolanic reactivity.
- LSB binder improves tailings backfill strength by filling pores and forming hydration gels.
- This study presents a viable alternative for stabilizing fine-grained lithium mica tailings.
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