C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/105
C01F 5/42 (2006.01)
Patent
CA 1210219
ABSTRACT OF THE DISCLOSURE: The invention relates to a process of purification of magnesic raw materials by converting calcinated magnesite, crude or contaminated magnesium oxide or magnesium hydroxide, hydrated magnesium carbonates, crude crystals of magnesium sulphite or a mixture of these compounds, to magnesium sulphite, in aqueous suspension, by the action of sulphur dioxide, characterized in that the thus arisen reaction mixture is separated into at least one fraction enriched with MgSO3?xH2O, wherein x is an integer of 3 or 6, and at least one fraction containing concentrated contaminants, the starting reaction mixture, or the fraction enriched with MgSO3?xH2O, or the fraction containing concentrated contaminants being acidified by intrcducing additional sulphur dioxide, temporarily to pH of less than 5 whereupon being brought back to pH of more than 5.2 by subsequently adding an alkali, or heated to a temperature of more than 60°C.
418969
Jerman Zdenek
Kralicek Jaroslav
Najmr Stanislav
Robic Robic & Associes/associates
Vysoka Skola Chemicko-Technologicka
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