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Updated: Aug 6, 2026

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal
Published on: June 2, 2022
Titanium white waste acid-mediated dealkalization and soil-like substrate construction from bauxite residue:
Xin Xie1, Bin Zhu1, Ximing Yan1
1Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Abstract:
Bauxite residue (BR), characterized by fine particle size and persistent alkalinity, results in massive stockpiling causing soil occupation and environmental risks. This study innovatively proposes a "waste-treats-waste" strategy employing titanium white waste acid (FS) combined with waste mushroom compost to construct soil-like substrates, systematically comparing it with conventional calcium sulfate (CS) dealkalization. Results demonstrate that FS treatment effectively inhibits pH rebound (maintaining 7.0-8.2 for 50 days) by disrupting sodalite crystal structure, improves particle properties (19.23 % increase in median particle size versus CS), and enhances ryegrass growth (over 50.00 % germination rate, 9.62 times plant dry biomass versus CS) and nutrient retention capacity in FS-based soil-like substrate. Microbial analysis revealed significantly increased abundance of copiotrophic phyla (e.g., Proteobacteria) in FS-based soil-like substrate. Mechanistic investigations identified synergistic effects between complex iron oxides (35 % increase) and prosperous plant root system in promoting macroaggregate (> 2 mm) formation. This work presents a green sustainable solution for BR utilization and ecological rehabilitation.
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