METHOD OF HYDROFLUOSILICIC ACID PRODUCTION

FIELD: chemistry. ^ SUBSTANCE: mixture of vapours and gases from uncovering of bertrandite-phenacite-fluorite concentrate with sulphuric acid containing SiF4 and HF is transferred to trapping. Absorption is performed in two-step absorber chain with closed-loop reflux system till concentration of fre...

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Hauptverfasser:	SHAKHVOROSTOV JURIJ VIKTOROVICH, DOBRUSIN SERGEJ JUR'EVICH, LEVANEVSKIJ IGOR' OLEGOVICH, SAMOJLOV VALERIJ IVANOVICH, D'JACHKOV BORIS ALEKSANDROVICH, ROMANOV VLADIMIR ALEKSANDROVICH, KOSHELEV ALEKSANDR BORISOVICH
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:	FIELD: chemistry. ^ SUBSTANCE: mixture of vapours and gases from uncovering of bertrandite-phenacite-fluorite concentrate with sulphuric acid containing SiF4 and HF is transferred to trapping. Absorption is performed in two-step absorber chain with closed-loop reflux system till concentration of free hydrogen fluoride in hydrofluosilicic acid reaches 1/3%. Hydrofluoric acid, concentration not less than 25%, is used as absorbent. ^ EFFECT: invention allows to obtain hydrofluosilicic acid containing less silica and to improve purification of fluorine - containing gases. ^ 1 tbl