METHOD OF PRODUCING ULTRAFINE CARBONATE POWDERS Russian patent published in 2009 - IPC C01B31/24 C01G49/00 C01F5/24 C01F11/18 B82B1/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical engineering of inorganic substances and materials. The method of producing ultrafine carbonate powders involves carbonation of an aqueous suspension of powders of natural carbonates with particle size not greater than 100 mcm under excess carbon dioxide pressure with simultaneous mechanical agitation of the suspension. Siderite is used to obtain iron carbonate, magnesite is used to obtain magnesium carbonate, dolomite is used to obtain calcium-magnesium carbonate and ankerite is used to obtain calcium-iron-magnesium carbonate. The carbonation process is carried out at temperature between 4 and 50°C and high carbon dioxide pressure ranging from 0.8 to 2.5 MPa without additional stabilisation of acidity of the medium. Further, carbon dioxide CO₂ pressure is reduced to atmospheric pressure and ultrafine carbonate powders are precipitated from saturated solutions of unstable hydrocarbonates.

EFFECT: invention allows for producing ultrafine carbonates from mineral material using simple technology.

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