Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 93, Issue -, Pages 41-47Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2020.03.012
Keywords
Bauxite residue; Rice straw; Alkali neutralization; Pyrolysis; Biochar
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Funding
- National Key Research and Development Program of China [2019YFC1803604]
- National Natural Science Foundation of China [41877511, 21707135]
- Fundamental Research Funds for the Central Universities of Central South University
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Bauxite residues, a large volume solid waste, are in urgent need of effective disposal and management. Especially, strategies to alleviate the high alkalinity of bauxite residue remain a big challenge. Here, we developed a synergistic pyrolysis to neutralize the alkalinity of bauxite residue and upgrade the structure of biomass simultaneously. By cooperating the catalytic feature from bauxite residue, rice straw, a cellulose-enriched biomass, could prefer to produce acidic components under a hypothermal pyrolysis temperature (below 250 degrees C) and partial oxygen-contained atmosphere as evidenced by the synchronous TGA-FTIR analysis. In return, these in-situ produced acidic components neutralized the bauxite residue profoundly (pH decreased from 11.5 to 7.2) to obtain a neutral product with long-term water leaching stability. Also, a higher pyrolysis temperature led to neutral biochar-based products with well-defined carbonization characteristics. Thus, the biomass-driven pyrolysis strategy provides a potential to dispose the alkalinity issue of bauxite residue and further opportunities for the sustainable reuse and continuing management of bauxite residue. (C) 2020 Published by Elsevier B.V. on behalf of The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.
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