Porous particles of calcium carbonate and method for the prepara

Details Porous particles of calcium carbonate and method for the prepara Porous particles of calcium carbonate and method for the prepara

1993-04-20

1994-03-08

Lewis, Michael

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

264 42, 423275, C01F 524

Patent

active

052924955

ABSTRACT:
A method is proposed for the preparation of porous calcium carbonate particles of which each of the particles is not an aggregate but has ink bottle-shaped pores each not communicating with the others. The method comprises: (a) blending particles of heavy calcium carbonate having a specific particle size distribution with from 0.1 to 0.3% by weight of a porosity-forming agent, e.g., sodium chloride; (b) calcining the powder blend at a temperature in the range from 800.degree. C. to 1000.degree. C. to decarbonate the calcium carbonate particles into particles of calcium oxide having pores developed therein; (c) slaking the particles of calcium oxide with steam to convert the calcium oxide particles into particles of calcium hydroxide; (d) drying the particles of calcium hydroxide at a temperature in the range from 100.degree. C. to 350.degree. C.; and (e) carbonating the dried particles of calcium hydroxide with carbon dioxide gas at a temperature in the range from 600.degree. C. to 750.degree.C.

REFERENCES:
patent: 4714603 (1987-12-01), Vanderheiden

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