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Neutralization of red mud using CO2 sequestration cycle.

Ramesh Chandra Sahu1, Raj Kishore Patel, Bankim Chandra Ray

  • 1Department of Chemistry, National Institute of Technology, Rourkela 769008, Orissa, India. rcsahu.chem@gmail.com

Journal of Hazardous Materials
|March 30, 2010
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Summary
This summary is machine-generated.

This study shows that using a carbon dioxide sequestration cycle can effectively neutralize red mud (RM) at ambient conditions. This cyclic process captures significant amounts of CO2, reducing red mud alkalinity and pH.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Materials Science

Background:

  • Red mud (RM) is a problematic alkaline waste from alumina production.
  • Effective neutralization and valorization of RM are crucial for environmental sustainability.
  • Carbon dioxide sequestration offers a potential pathway for RM treatment.

Purpose of the Study:

  • To investigate the neutralization of red mud using a carbon dioxide gas sequestration cycle.
  • To characterize the neutralized red mud (NRM) and assess CO2 capture efficiency.
  • To evaluate the potential of cyclic carbonation for enhanced CO2 sequestration.

Main Methods:

  • Red mud neutralization via a CO2 gas sequestration cycle at ambient conditions.
  • Characterization of NRM using XRD, SEM, EDX, FT-IR, and auto-titration.
  • Analysis of CO2 sequestration efficiency across multiple cycles.

Main Results:

  • XRD analysis showed increased gibbsite and ilmenite formation in NRM.
  • EDX confirmed higher concentrations of Na, C, O, and Si in carbonated filtrate.
  • Significant CO2 sequestration achieved, with cyclic processes showing high efficiency (approx. 54-58% per 10g RM).
  • pH decreased from 11.8 to 8.45, and alkalinity reduced from 10,789 to 178 mg/L.
  • Acid neutralizing capacity of NRM was approximately 0.23 mol H(+)/kg.

Conclusions:

  • Cyclic carbonation is an effective method for neutralizing red mud and sequestering CO2.
  • The process significantly reduces the alkalinity and pH of red mud.
  • Cyclic CO2 sequestration offers advantages over single-step processes for large-scale CO2 capture.