Obtention and characterization of ferrous chloride FeCl_2•4H_2O from water pickling liquors



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Alcaraz, Lorena and Sotillo Buzarra, Belén and Marco, Jose F. and Alguacil, Francisco J. and Fernández Sánchez, Paloma and López, Félix A. (2021) Obtention and characterization of ferrous chloride FeCl_2•4H_2O from water pickling liquors. Materials, 14 (17). ISSN 1996-1944

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Official URL: http://dx.doi.org/10.3390/ma14174840


As a hazardous waste, water pickling liquors must be properly treated. An alternative consists of promoting the formation of ferrous salts from this residue due to their higher ferrous content. Since FeCl_2•4H_2O is widely used in several applications, obtaining pure crystals of this material appears to be an interesting prospect. However, this compound has scarcely been investigated. In the present work, FeCl_2•4H_2O crystals were obtained from water pickling liquors. Their structural and morphological characteristics were investigated by X-ray diffraction, scanning electron microscopy as well as Mossbauer spectroscopy. In addition, the photoluminescence study of the obtained samples was also assessed. It was observed that after some aging time, the obtained crystals changed in colour from green to more yellowish. As such, the aged sample was also evaluated, and their structural characteristics were compared with the original crystals. Despite this, the obtained crystals exhibit a FeCl_2•4H_2O structure, which is not modified with the aging of the sample.

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©2021 By the Authors
Authors from the National Center for Metallurgical Research, Spanish National Research Council (CENIM-CSIC) would like to thank the financial support through the project DECAPVALUE. HIASA Contract ID 20200543.
B.S. acknowledges the postdoctoral fellowship from the “Atracción de Talento” Program funded by the Comunidad de Madrid (2017-T2/IND-5465). P.F. acknowledges Complutense
University of Madrid and Banco Santander for support via the project UCM-Santander 2019 (PR87/19-22613). Financial support from the Spanish Agencia Estatal de Investigación through project RTI2018-095303-B-C51 is gratefully acknowledged.

Uncontrolled Keywords:Waste-water; Iron; Raman; Acid; Precipitation; Spectroscopy; Tetrahydrate; Mossbauer; Sludge; Oxides; Ferrous chloride; FeCl_2; 4H_2O crystals; Water pickling liquors
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:68080
Deposited On:08 Oct 2021 18:35
Last Modified:13 Oct 2021 07:17

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