FIELD: chemistry.
SUBSTANCE: invention can be used in production of paper, cardboard, plastic, rubber, concrete or paints. Method of producing filler containing calcium, sodium or magnesium carbonate involves forming an acidic bicarbonate ion solution from a corresponding hydroxide solution by adding carbon dioxide to solution. Forming of carbonate portion of filler is carried out by increasing pH of obtained acidic bicarbonate ion solution to a neutral or alkaline range by means of pressure below atmospheric pressure or centrifugal force at rotation speed of 50 to 2,000 rpm or a combination thereof.
EFFECT: invention increases strength, degree of gloss of paper or cardboard product, optical density of paint layer and opacity due to better fixation of carbonate filler in gaps between fibres of fibrous product.
16 cl, 4 dwg, 6 tbl, 4 ex
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|---|---|---|---|
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