Study on Fluidity and Deposition Characteristics of Air-Containing Filling Slurry
Chunming Ai1,2, Haichuan Lin1,2, Ziqi Chen3
1College of Safety Science and Engineering, Liaoning Technical University, Huludao 125000, China.
ACS Omega
|January 1, 2025
Summary
Adding air-entraining agents to slurry backfill significantly improves flow properties and filling height. This enhances mine safety and sustainable resource extraction by reducing viscosity and improving slurry fluidity.
Area of Science:
- Mining Engineering
- Materials Science
- Fluid Mechanics
Background:
- Gob area backfill technology is vital for mine safety and sustainable resource exploitation.
- Slurry backfill is a primary method, with flow properties and filling height critical for efficiency and safety.
Purpose of the Study:
- To investigate the flow and deposition characteristics of gas-containing filling slurry.
- To enhance slurry flow properties and increase filling height for improved mine extraction efficiency.
Main Methods:
- Combined theoretical analysis, laboratory experiments, and field tests.
- Utilized concrete gas content tester, paddle rheometer, slump cone, and gob area similarity models.
- Investigated gas content, rheological properties, slump flow, and slurry deposition.
Main Results:
- Increased slurry gas content with air-entraining agents reduced yield stress by 49.27% and viscosity by 48%.
- Air-entraining agents enhanced slurry fluidity by altering particle arrangement and disrupting flocculation.
- Field tests showed decreased settlement rate and improved expansion ratio of slurry with air-entraining agents.
Conclusions:
- Air-entraining agents effectively improve the flow and deposition characteristics of filling slurry.
- Enhanced slurry fluidity and reduced settlement rate contribute to improved backfill effectiveness.
- This research offers significant advancements for slurry backfill technology in mining operations.
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