FIELD: paper industry. SUBSTANCE: method comprises causticizing sodium carbonate with lime milk, separating calcium carbonate and potassium hydroxide resulting from causticization stage at carbonizing mixture of lime milk and calcium carbonate resulting from causticization stage. Method makes it possible to increase whiteness of calcium carbonate, reduce residual content of calcium hydroxide therein and achieve desired granulometric spectrum. EFFECT: more efficient preparation method. 6 cl, 2 ex, 2 tbl
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