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LEACHING BEHAVIOUR OF THE RESIDUE FROM THE THERMO-MECHANICAL TREATMENT OF ALUMINIUM MELTING DROSS

Balázs Hegedüs, Tamás Kékesi

2018enaluminiumleachingrecyclingdrossenvironment

Abstract

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A large amount of currently useless basically oxide residue is produced by the treatment of dross obtained from the melting of alloyed aluminium scrap. Its negligible residual metallic component does not make it feasible for any further metallurgical processing. However, it may have a high content of chloride salts, which need to be removed not only for recycling purposes but also to make this residue suitable for applications in construction and road paving materials, or as a slag-forming additive in the steel industry. In this study, we conducted hydrometallurgical treatments with pure water, sulphuric acid, and sodium hydroxide following fine grinding to examine the efficiency of chloride salt removal and the reduction of residual metallic content. Results demonstrated that leaching with water effectively removed significant amounts of NaCl and KCl in a short duration, but the evolution of ammonia from side reactions remained unavoidable. Sulphuric acid treatment was found to be effective in removing residual metals and mitigating ammonia evolution. Conversely, while sodium hydroxide could aggressively dissolve aluminium, it also increased ammonia release. The findings suggest that water leaching, potentially combined with sulphuric acid leaching, could yield a satisfactory residual dross composition for non-metallurgical applications.

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Cite This Work

@article{088b1c08-2f2c-4f6d-9bbf-7f8f9f7863ba,
  title={LEACHING BEHAVIOUR OF THE RESIDUE FROM THE THERMO-MECHANICAL TREATMENT OF ALUMINIUM MELTING DROSS},
  author={Balázs Hegedüs and Tamás Kékesi},
  year={2018},
  language={en}
}
TY  - JOUR
TI  - LEACHING BEHAVIOUR OF THE RESIDUE FROM THE THERMO-MECHANICAL TREATMENT OF ALUMINIUM MELTING DROSS
AU  - Balázs Hegedüs
AU  - Tamás Kékesi
PY  - 2018
LA  - en
ER  -

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