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In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change i...

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Autores principales: Ivanova, Tatiana K., Kremenetskaya, Irina P., Novikov, Andrey I., Semenov, Valentin G., Nikolaev, Anatoly G., Slukovskaya, Marina V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588119/
https://www.ncbi.nlm.nih.gov/pubmed/34772257
http://dx.doi.org/10.3390/ma14216731
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author Ivanova, Tatiana K.
Kremenetskaya, Irina P.
Novikov, Andrey I.
Semenov, Valentin G.
Nikolaev, Anatoly G.
Slukovskaya, Marina V.
author_facet Ivanova, Tatiana K.
Kremenetskaya, Irina P.
Novikov, Andrey I.
Semenov, Valentin G.
Nikolaev, Anatoly G.
Slukovskaya, Marina V.
author_sort Ivanova, Tatiana K.
collection PubMed
description Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change in serpentines with a high iron content during roasting might be used to indicate the changes in chemical activity in the technological process. This study gives a scientific basis for the express control of roasting of such serpentines by comparing the colors of the obtained material and the reference sample. Serpentines with different chemical activity were studied by X-ray diffraction, Mössbauer spectroscopy, and optical spectroscopy. The color parameters were determined using RGB (red, green, blue), CIELAB (International Commission on Illumination 1976 L*a*b), and HSB (hue, brightness, saturation) color models. The color of heat-treated samples was found to be affected by changes in the crystallochemical characteristics of iron included in the structure of the serpentine minerals. The color characteristics given by the CIELAB model were in good coherence with the acid-neutralizing ability and optical spectra of heat-treated serpentines. Thus, in contrast to the long-term analysis by these methods, the control by color palette provides an express assessment of the quality of the resulting product.
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spelling pubmed-85881192021-11-13 In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content Ivanova, Tatiana K. Kremenetskaya, Irina P. Novikov, Andrey I. Semenov, Valentin G. Nikolaev, Anatoly G. Slukovskaya, Marina V. Materials (Basel) Article Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change in serpentines with a high iron content during roasting might be used to indicate the changes in chemical activity in the technological process. This study gives a scientific basis for the express control of roasting of such serpentines by comparing the colors of the obtained material and the reference sample. Serpentines with different chemical activity were studied by X-ray diffraction, Mössbauer spectroscopy, and optical spectroscopy. The color parameters were determined using RGB (red, green, blue), CIELAB (International Commission on Illumination 1976 L*a*b), and HSB (hue, brightness, saturation) color models. The color of heat-treated samples was found to be affected by changes in the crystallochemical characteristics of iron included in the structure of the serpentine minerals. The color characteristics given by the CIELAB model were in good coherence with the acid-neutralizing ability and optical spectra of heat-treated serpentines. Thus, in contrast to the long-term analysis by these methods, the control by color palette provides an express assessment of the quality of the resulting product. MDPI 2021-11-08 /pmc/articles/PMC8588119/ /pubmed/34772257 http://dx.doi.org/10.3390/ma14216731 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ivanova, Tatiana K.
Kremenetskaya, Irina P.
Novikov, Andrey I.
Semenov, Valentin G.
Nikolaev, Anatoly G.
Slukovskaya, Marina V.
In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title_full In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title_fullStr In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title_full_unstemmed In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title_short In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content
title_sort in situ control of thermal activation conditions by color for serpentines with a high iron content
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8588119/
https://www.ncbi.nlm.nih.gov/pubmed/34772257
http://dx.doi.org/10.3390/ma14216731
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