Abstract
The influence of NH4HF2 fluorinating agent on the yield of ammonium hexafluorosilicate intermediate product and amorphous silica in the fine purification of silica-containing raw material by the fluoride technology has been studied. Mixtures with different fluorinating agent contents were investigated by synchronous thermal analysis. The determination of the phases of intermediate products at various ratios of starting silica-containing raw material and NH4HF2 was carried out by the X-ray phase analysis method. The optimal ratio of components for the preparation of ammonium hexafluorosilicate and amorphous silica with maximal yield and purity level of the final products was determined.
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