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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MDPI AG
2021
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oai:doaj.org-article:d95db5ca45b34626bf96833d87f725622021-11-11T18:13:16ZIn Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content10.3390/ma142167311996-1944https://doaj.org/article/d95db5ca45b34626bf96833d87f725622021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6731https://doaj.org/toc/1996-1944Serpentine 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.Tatiana K. IvanovaIrina P. KremenetskayaAndrey I. NovikovValentin G. SemenovAnatoly G. NikolaevMarina V. SlukovskayaMDPI AGarticleserpentinechrysotileironmuffle furnacerotary furnaceX-ray diffractionTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6731, p 6731 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
serpentine chrysotile iron muffle furnace rotary furnace X-ray diffraction Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
| spellingShingle |
serpentine chrysotile iron muffle furnace rotary furnace X-ray diffraction Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Tatiana K. Ivanova Irina P. Kremenetskaya Andrey I. Novikov Valentin G. Semenov Anatoly G. Nikolaev Marina V. Slukovskaya In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content |
| 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. |
| format |
article |
| author |
Tatiana K. Ivanova Irina P. Kremenetskaya Andrey I. Novikov Valentin G. Semenov Anatoly G. Nikolaev Marina V. Slukovskaya |
| author_facet |
Tatiana K. Ivanova Irina P. Kremenetskaya Andrey I. Novikov Valentin G. Semenov Anatoly G. Nikolaev Marina V. Slukovskaya |
| author_sort |
Tatiana K. Ivanova |
| title |
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_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_sort |
in situ control of thermal activation conditions by color for serpentines with a high iron content |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/d95db5ca45b34626bf96833d87f72562 |
| work_keys_str_mv |
AT tatianakivanova insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent AT irinapkremenetskaya insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent AT andreyinovikov insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent AT valentingsemenov insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent AT anatolygnikolaev insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent AT marinavslukovskaya insitucontrolofthermalactivationconditionsbycolorforserpentineswithahighironcontent |
| _version_ |
1718431914146136064 |