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

Sh M. Sharafeev, V. M. Pogrebenkov

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)200-206
Number of pages7
JournalRefractories and Industrial Ceramics
Volume61
Issue number2
DOIs
Publication statusPublished - 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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