PURPOSE: To obtain a calcite-type calcium carbonate having spherical form with a diameter of 1-5μm by adding hydrogen peroxide to an aqueous suspension of calcium hydroxide and contacting and reacting the mixture with a carbon dioxide-containing gas at a specific temperature.

CONSTITUTION: The objective calcium carbonate can be produced by adding ≥0.8mol (based on 1mol of calcium hydroxide) of hydrogen peroxide to an aqueous suspension of calcium hydroxide and starting the contact reaction with a carbon dioxide-containing gas at a liquid temperature of ≤40°C. When the amount of hydrogen peroxide added to the suspension is <80mol% based on calcium hydroxide, the formed calcite-type calcium carbonate has cubic form with a diameter of ≥0.1μm. The addition of hydrogen peroxide is preferably performed before the introduction of carbon dioxide gas. When it is added after the introduction of carbon dioxide gas, the formed calcite-type calcium carbonate also has cubic form with a diameter of ≥0.1μm. The reaction initiation temperature exceeding 40°C is undesirable because of the formation of cubic calcite-type calcium carbonate having a diameter of ≥0.1μm.