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Closed-circulating CO2 sequestration process evaluation utilizing wastes in steelmaking plant
Huining Zhang1, Quanqin Zuo1, Chao Wei1
1Faculty of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China.
The Science of the Total Environment
|June 13, 2020
Summary
This study introduces a closed-circulating carbon dioxide (CO2) sequestering process for steel plant waste. The cold-rolling waste water (CRW) circulation strategy shows superior CO2 uptake efficiency and cost reduction for a greener economy.
Area of Science:
- Metallurgical Engineering
- Environmental Science
- Chemical Engineering
Background:
- Steel plant waste management is crucial for a green circular economy.
- Exploring waste valorization and harmless disposal methods is significant.
- Carbon dioxide (CO2) sequestration in industrial waste offers environmental benefits.
Purpose of the Study:
- To propose and evaluate a closed-circulating CO2 sequestering process for steel plant waste.
- To compare the effectiveness of slag circulation versus cold-rolling waste water (CRW) circulation strategies.
- To analyze the kinetics, energy consumption, and cost-effectiveness of the proposed process.
Main Methods:
- Systematic discussion of CO2 uptake efficiency, carbonation degree, and desalination rate for two circulation strategies.
- Kinetic analysis using modeling and molecular simulation.
- Simulation of energy consumption and cost for economic evaluation.
Main Results:
- Peak performance for both strategies achieved with 3-5 circulation times.
- CRW circulation strategy demonstrated higher CO2 uptake efficiency (487kgCO2/tslag) and a 48.9% desalination rate under specific conditions (5 cycles, 60°C, 20 L/g, 90 min).
- CRW strategy doubled CO2 sequestration efficiency compared to previous methods, with significant reductions in energy consumption (129%-183%) and cost (35.6%).
Conclusions:
- The CRW circulation strategy is superior for CO2 sequestration in steel plant waste.
- The proposed closed-circulating process is economical and viable for industrial application.
- Optimized circulation times (3-5 cycles) maximize process efficiency.
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