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A new disposal method for white mud: Replacing limestone in iron ore sintering
Hanxiao Meng1, Jiankang Wang1, Lei Zhang1
1State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Journal of Environmental Management
|October 26, 2023
Summary
White mud (WM), a CaCO3-rich waste from pulp production, can replace 50% of limestone in iron ore sintering. This strategy is feasible, maintaining sinter quality while boosting WM disposal and economic benefits.
Area of Science:
- Materials Science
- Environmental Engineering
- Chemical Engineering
Background:
- Pulp production generates significant CaCO3-rich solid waste, termed white mud (WM).
- Improper disposal of WM poses global environmental challenges.
- Utilizing WM as a supplementary material offers a sustainable solution.
Purpose of the Study:
- To investigate the characteristics of white mud (WM).
- To evaluate the feasibility of replacing limestone with WM in iron ore sintering.
- To assess the impact of WM on sinter quality and production.
Main Methods:
- Characterization of WM composition, microstructure, and thermal decomposition.
- Granulation and sinter pot tests with varying WM substitution levels.
- Metallographic and micropore observations to analyze sinter properties.
Main Results:
- Sintering rate remained stable with up to 50% limestone replacement by WM, with moisture control.
- Sinter quality and production indicators were comparable to the control.
- Mineral phase and microporosity were similar, with only a 5.5% decrease in the comprehensive index.
Conclusions:
- Replacing 50% of limestone with WM in industrial sintering is technically feasible.
- This approach enhances WM disposal capacity and offers economic advantages.
- WM can be effectively utilized as a flux in iron ore sintering.
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