Phase Formation Processes in Natural Magnesium Silicates of Various Structures by Ammonium Fluoride Treatment

Abstract

The processes of forsterite, enstatite, and talc treatment by ammonium fluoride have been studied. The phase-formation processes occurring during firing of fluorinated minerals were studied. It was established that structural silica of the minerals reacts with ammonium hydrogen difluoride with the formation of ammonium hexafluorosilicate, sublimation of which leads to removal of structural silica from the minerals with partial destruction of their structure. The firing of fluorinated minerals leads to their structural transformation with formation of magnesium nesosilicates and fluoronesosilicates.

Original language	English
Pages (from-to)	200-206
Number of pages	7
Journal	Refractories and Industrial Ceramics
Volume	61
Issue number	2
DOIs	https://doi.org/10.1007/s11148-020-00456-6
Publication status	Published - 1 Jul 2020

Keywords

ammonium fluoride treatment
ammonium hexafluorosilicate (HFSA)
enstatite
forsterite
talc

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1007/s11148-020-00456-6

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Sharafeev, S. M., & Pogrebenkov, V. M. (2020). Phase Formation Processes in Natural Magnesium Silicates of Various Structures by Ammonium Fluoride Treatment. Refractories and Industrial Ceramics, 61(2), 200-206. https://doi.org/10.1007/s11148-020-00456-6

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abstract = "The processes of forsterite, enstatite, and talc treatment by ammonium fluoride have been studied. The phase-formation processes occurring during firing of fluorinated minerals were studied. It was established that structural silica of the minerals reacts with ammonium hydrogen difluoride with the formation of ammonium hexafluorosilicate, sublimation of which leads to removal of structural silica from the minerals with partial destruction of their structure. The firing of fluorinated minerals leads to their structural transformation with formation of magnesium nesosilicates and fluoronesosilicates.",

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N2 - The processes of forsterite, enstatite, and talc treatment by ammonium fluoride have been studied. The phase-formation processes occurring during firing of fluorinated minerals were studied. It was established that structural silica of the minerals reacts with ammonium hydrogen difluoride with the formation of ammonium hexafluorosilicate, sublimation of which leads to removal of structural silica from the minerals with partial destruction of their structure. The firing of fluorinated minerals leads to their structural transformation with formation of magnesium nesosilicates and fluoronesosilicates.

AB - The processes of forsterite, enstatite, and talc treatment by ammonium fluoride have been studied. The phase-formation processes occurring during firing of fluorinated minerals were studied. It was established that structural silica of the minerals reacts with ammonium hydrogen difluoride with the formation of ammonium hexafluorosilicate, sublimation of which leads to removal of structural silica from the minerals with partial destruction of their structure. The firing of fluorinated minerals leads to their structural transformation with formation of magnesium nesosilicates and fluoronesosilicates.

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KW - ammonium hexafluorosilicate (HFSA)

KW - enstatite

KW - forsterite

KW - talc

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