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

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

Translated title of the contribution: Selective separation of iron and chromium from stainless steel spent pickling

J. L. Gálvez^*
, J. Dufour
, C. Negro
, F. López-Mateos

^*Corresponding author for this work

Complutense University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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.

Translated title of the contribution	Selective separation of iron and chromium from stainless steel spent pickling
Original language	Spanish
Pages (from-to)	475-478
Number of pages	4
Journal	Revista de Metalurgia
Volume	SPEC. VOL.
DOIs	https://doi.org/10.3989/revmetalm.2005.v41.iextra.1079
Publication status	Published - 2005
Externally published	Yes

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10.3989/revmetalm.2005.v41.iextra.1079

Cite this

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title = "Separaci{\'o}n selectiva de hierro y cromo de las lej{\'i}as agotadas del decapado de acero inoxidable",

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.",

keywords = "Chromium, Iron, Nickel, Pickling, Selective precipitation, Stainless steel",

author = "G{\'a}lvez, \{J. L.\} and J. Dufour and C. Negro and F. L{\'o}pez-Mateos",

year = "2005",

doi = "10.3989/revmetalm.2005.v41.iextra.1079",

language = "Espa{\~n}ol",

volume = "SPEC. VOL.",

pages = "475--478",

journal = "Revista de Metalurgia",

issn = "0034-8570",

publisher = "CSIC Consejo Superior de Investigaciones Cientificas",

}

TY - JOUR

T1 - Separación selectiva de hierro y cromo de las lejías agotadas del decapado de acero inoxidable

AU - Gálvez, J. L.

AU - Dufour, J.

AU - Negro, C.

AU - López-Mateos, F.

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

KW - Chromium

KW - Iron

KW - Nickel

KW - Pickling

KW - Selective precipitation

KW - Stainless steel

UR - https://www.scopus.com/pages/publications/33644660368

U2 - 10.3989/revmetalm.2005.v41.iextra.1079

DO - 10.3989/revmetalm.2005.v41.iextra.1079

M3 - Artículo

AN - SCOPUS:33644660368

SN - 0034-8570

VL - SPEC. VOL.

SP - 475

EP - 478

JO - Revista de Metalurgia

JF - Revista de Metalurgia

ER -

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

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