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Enhanced Hydrolysis of Aluminum Nitride from Secondary Aluminum Dross Through Combination of Wet-Stirred Milling and Alkaline Leaching.
- Source :
- Waste & Biomass Valorization; Dec2023, Vol. 14 Issue 12, p4257-4268, 12p
- Publication Year :
- 2023
-
Abstract
- Deep hydrolysis for removing hazardous aluminum nitride (AlN) from secondary aluminum dross (SAD) remains a challenge nowadays. Enhanced hydrolysis of AlN from SAD through a combination of wet-stirred milling and alkaline leaching is investigated in the present study, which has not been reported before. SAD is activated during wet-stirred milling with water by reducing the grain size and increasing the active surface area. Leaching with NaOH dissolves the hydrolysis products (AlOOH, Al(OH)<subscript>3</subscript>) to expose reactive sites of unhydrolyzed AlN, contributing to the enhanced hydrolysis process. Results indicate that by utilizing optimized conditions (10 min wet milling, 5 wt.% NaOH solution, L/S ratio of 2, 75 ℃ temperature, and 120 min duration), 98.3% of AlN is removed from SAD. The kinetic analysis indicates that the hydrolysis process is controlled by both diffusion and chemical reactions, with the activation energy calculated to be 31.0 kJ/mol. After undergoing this enhanced hydrolysis process, the residue, which consisted primarily of Al<subscript>2</subscript>O<subscript>3</subscript> and Al(OH)<subscript>3</subscript>,can be recycled as Al concentrate. The technology has been already applied in a pilot plant and achieved a favorable effect in practical applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18772641
- Volume :
- 14
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Waste & Biomass Valorization
- Publication Type :
- Academic Journal
- Accession number :
- 173471123
- Full Text :
- https://doi.org/10.1007/s12649-022-02020-4