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Updated: Jun 17, 2026

Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
Sequestration of carbon dioxide (CO2) using red mud.
Vishwajeet S Yadav1, Murari Prasad, Jeeshan Khan
1Environmental Chemistry Division, Advanced Materials & Processes Research Institute, (C.S.I.R.), Hoshangabad Road, Bhopal 462064, MP, India.
Red mud, a hazardous waste from aluminium production, effectively captures carbon dioxide (CO2). The study found that a specific fraction, RM II, demonstrated the highest CO2 sequestration capacity.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Red mud is a hazardous waste byproduct of alumina extraction.
- It has potential as an inexpensive adsorbent material.
- Greenhouse gas sequestration is crucial for climate change mitigation.
Purpose of the Study:
- To investigate the efficacy of red mud for carbon dioxide (CO2) sequestration.
- To evaluate the carbonation capacity of different red mud fractions.
- To identify the mineral phases responsible for CO2 adsorption.
Main Methods:
- Red mud was separated into three size fractions (RM I, RM II, RM III).
- Carbonation experiments were conducted at room temperature and 3.5 bar pressure.
- Techniques including X-ray diffraction, FTIR, and SEM were used for characterization.
Main Results:
- Calcium-bearing minerals (cancrinite and chantalite) were identified as key for carbonation.
- Fraction RM II, with higher cancrinite content, showed maximum carbonation.
- The maximum carbonation capacity was determined to be 5.3 g CO2 per 100 g of RM II.
Conclusions:
- Red mud, particularly fraction RM II, is a viable material for CO2 sequestration.
- The presence of specific calcium-bearing minerals enhances carbonation efficiency.
- This research offers a sustainable approach to managing hazardous red mud waste.
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