Thermal transformations in polymineral technogenic cement raw

The results of physicochemical studies of composition and thermal transformations of large-tonnage wastes of skarn-magnetite ore dressing in Kazakhstan are presented. To determine materials' composition of the following methods were used: X-ray, differential and thermal, Mössbauer and infrared...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 889; no. 1; pp. 12025 - 12032
Main Author Miryuk, O A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2020
Subjects
Beneficiation
Calcium ferrous silicates
Calcium magnesium silicates
Cement
Chemical composition
Clinker
Dicalcium silicate
Diopside
High temperature
Low temperature
Magnetite
Phases
Portland cements
Silicates
Thermal transformations
Wastes
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Summary:The results of physicochemical studies of composition and thermal transformations of large-tonnage wastes of skarn-magnetite ore dressing in Kazakhstan are presented. To determine materials' composition of the following methods were used: X-ray, differential and thermal, Mössbauer and infrared spectroscopy. The stepwise nature of transformation of anthropogenic material during firing, due to polymineral composition of ore dressing wastes is revealed. Provides information on the chemical and mineral composition, thermal transformations of ore dressing wastes. It has been established that the chemical-mineral characteristics of natural silicates determine formation processes and properties of clinker phases. The features of the formation of clinker phases with the participation of the technogenic component of the raw mix, which consist in the activity of low-temperature interactions, the variety of intermediate phases are revealed. It has been established that the staging of belite formation with the participation of actinolite, albite, andradite, grossular, diopside, chlorite, epidote is due to gradual transformations of minerals into intermediate phases C2AS, C3MS2, of which C2S is formed at temperatures of 1000-1300oC. Alite formation is intensified due to high-temperature belite formation and doping impurities. Skarn-magnetite ores wastes are an effective cement raw material, providing high-quality portland cement clinker using low-energy and resource-saving technology.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/889/1/012025