Abstract
The possibility of processing tungsten- and aurum-containing raw materials using a mixture of NH4HF2 and (NH4)2SO4 has been studied. It has been established that when heated with the indicated reagents to 200°C, fluorination of the components included in the mineral raw material occurs with the formation of simple and complex fluorides; a further increase in temperature is accompanied by the formation of ammonium hydrosulfate NH4HSO4, which leads to the conversion of fluorides into double sulfates. The influence of the content of NH4HF2 in the reaction mixture on the degree of processing mineral raw materials was shown. The ways of extracting components of mineral raw materials with obtaining commercially demanded compounds as commercial products are demonstrated.
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