Effect of Elemental Iron Containing Bauxite Residue Obtained After Electroreduction on High-Pressure Alkaline Leaching of Boehmitic Bauxite and Subsequent Thickening Rate

Materials, Journal Year: 2025, Volume and Issue: 18(2), P. 224 - 224

Published: Jan. 7, 2025

The use of reduction leaching in the production alumina from bauxite by Bayer process order to decrease amount waste (bauxite residue) adding elemental iron or aluminum, as well Fe2+ salts and organic compounds stage high-pressure leaching, requires purchase relatively expensive reagents large quantities. aim this study was investigate possibility electrolytically reduced residue (BR) a substitute for these reagents. Reduced BR obtained Al-goethite containing using bulk cathode alkaline suspension. degree deoxidation Fe3+ 55% after 2 h electrolysis with current yield more than 73%. addition according shrinking core model leads change limiting boehmitic surface chemical reaction internal diffusion. activation energy decreased 32.9 17.2 kJ/mol red mud. It also shown that increased rate thickening slurry factor 1.5 Na2O losses 15% without lime. solid examined means X-ray diffraction analysis scanning electron microscopy confirm presence magnetite iron. A preliminary techno-economic carried out assess applicability proposed process.

Language: Английский

Study on phase transformation and dealkalization of red mud in NaOH-Ca(OH)2 system and CO2 adsorption performance of dealkalization residue

Process Safety and Environmental Protection, Journal Year: 2025, Volume and Issue: unknown, P. 107012 - 107012

Published: March 1, 2025

Language: Английский