To stably manufacture a carbonated solid having a high strength regardless of the particle size distribution or the like of a raw material.
The inside of a packed layer of noncarbonated Ca-containing raw material (or the carbonated solid) containing water is evacuated or the inside of the packed layer is evacuated after water is incorporated inside the packed layer to discharge a part of the water and after that, carbonation reaction is brought onto the packed layer under the presence of gaseous carbon dioxide. By the evacuation, surface sticking water on the raw material particle uniformly exists and gaps to be a flow passage of CO2 are properly secured between raw material particles and by causing the carbonation reaction in the packed layer in this state, the carbonation reaction efficiently and uniformly proceeds through the whole packed layer and the carbonated solid having high strength can be obtained.
MIYATA YASUTO
ISOO NORIO
TAKAHASHI TATSUTO
