Conversion process for strontium sulfate in carbonate rich celes

Details Conversion process for strontium sulfate in carbonate rich celes Conversion process for strontium sulfate in carbonate rich celes

1996-11-18

2000-12-12

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423409, 423431, C01F 1118

Patent

active

061594369

ABSTRACT:
This invention relates to a low energy hydrometallurgical process for the production of strontium carbonate of chemical and glass grade from carbonate rich celestite ores typically having around 28% combined strontianite, calcite, dolomite and other carbonates. This process avoids negative environmental impact usually associated to calcining technology and involves fewer processing stages than prior art hydrometallurgical processes. Thus, in two stages which provide: (1) the acid wash of the celestite ore in an acid medium to eliminate carbonates present other than strontium carbonates and (2) the conversion of the thus enriched celestite to strontium carbonate in an air/vapor-lift loop reactor using a sodium carbonate aqueous medium, a step permitting recovery of sodium sulfate as a by-product. Thus, an almost complete conversion of the strontium sulfate present in the enriched ore is achieved.

REFERENCES:
patent: 3754993 (1973-08-01), Oguchi et al.
patent: 4666688 (1987-05-01), De Buda

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