Tank apparatus, a system for dispersing by circulating a mixture, and a method for dispersing by circulating a mixture

A tank apparatus that stores a raw material that is slurry or liquid and supplies powdery additives to the raw material to mix them with the raw material, the tank apparatus comprising:

• a tank for storing the raw material;
• a screw-type device for supplying powdery additives that is integral with the tank and downwardly supplies the powdery additives to the raw material in the tank;
• and an agitator that agitates a mixture of the raw material and the additives in the tank;
• wherein a tip of a part for supplying powdery additives of the screw-type device for supplying powdery additives is inserted into the mixture in the tank,
• and
• wherein a blade for agitation of the agitator has a portion for agitating the raw material near a bottom that is located so as to have a predetermined gap between the portion for agitating the raw material near the bottom and a bottom plate of the tank, has a portion for agitating the raw material near a surface that is located so as to have a predetermined gap between the portion for agitating the raw material near the surface and the surface of the raw material in the tank and wherein said portion for agitating the raw material near the surface extends through a central portion of the tank, wherein the screw-type device for supplying powdery additives nests with said portion near the surface of the blade, and has a portion for scraping the powdery additives that is located at a position that is lower than a position of the portion for agitating the raw material near the surface and that maintains a predetermined gap between the portion for scraping the powdery additives and the tip of the part for supplying the powdery additives so as to cause the powdery additives at the tip of the part for supplying the powdery additives to flow into the tank.