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