Separación selectiva de hierro y cromo de las lejías agotadas del decapado de acero inoxidable

J. L. Gálvez; J. Dufour; C. Negro; F. López-Mateos

doi:10.3989/revmetalm.2005.v41.iExtra.1079

Selective separation of iron and chromium from stainless steel spent pickling

Authors

J. L. Gálvez Dpto. de Ingeniería Química, Universidad Complutense de Madrid
J. Dufour Dpto. de Ingeniería Química, Universidad Complutense de Madrid
C. Negro Dpto. de Ingeniería Química, Universidad Complutense de Madrid
F. López-Mateos Dpto. de Ingeniería Química, Universidad Complutense de Madrid

DOI:

https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1079

Keywords:

Stainless steel, Pickling, Selective precipitation, Iron, Chromium, Nickel

Abstract

Stainless steel spent pickling baths are very complex solutions of metals and acids (HNO₃ and HF) and are a very important environmental concern. Several processes have been developed for acid recovery (free and bounded acid) with techniques like acid retardation, solvent extraction, evaporation and dialysis diffusion. In these processes, metallic content is precipitated and treated for its disposal. We have developed a process that permits the separation of metals by means of a selective precipitation, induced by adding free fluoride. Iron (Fe) and chromium (Cr) precipitate as pentafluorides and nitrogennickel (Ni) remains in solution. After this stage, complex fluorides can be hydrolized with alkali to give iron and chromium hydroxides, releasing fluoride in solution

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Published

2005-12-17

How to Cite

Gálvez, J. L., Dufour, J., Negro, C., & López-Mateos, F. (2005). Selective separation of iron and chromium from stainless steel spent pickling. Revista De Metalurgia, 41(Extra), 475–478. https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1079

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Issue

Vol. 41 No. Extra (2005)

Section

Articles

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