Hitachi, Ltd.

Hajime Iinuma

Yukio Hishinuma

Susumu Horiuchi

Norio Arashi

Mikio Hirano

Kenichi Gomi

Hidetoshi Akimoto

Takeo Komuro

Osamu Kanda

Satoshi Hirayama

Ryoichi Ishikawa

An equipment for the volume-reducing treatment of a radioactive waste is disclosed. The equipment comprises means for drying and milling radioactive waste liquor, waste sludge, waste resin and the like generated from an atomic power plant, means for pelletizing the powder obtained from the drying and milling means and means for charging the pellet thus formed into a drum. The pelletizing means is a roller press consisting of a pair of press rolls, each having plural pockets formed on the surface thereof. Air vent grooves are also formed on the surface of each press roll so as to extend from the pocket in the rotating direction of the roll.

Equipment for volume-reducing treatment of radioactive waste

Sulfur oxides contained in the flue gas from coal-fired boiler are adsorbed by an adsorbent prepared by dry-distilling a portion of fuel coal satisfying at least one of requirements of an ash content lower than 15% by weight and a fixed carbon content of at least 50% by weight, thereby producing semi-coke, and activating the semi-coke by steam, and then the sulfur oxides-adsorbed adsorbent is heated to desorb the adsorbed sulfur oxides at a high concentration. The desorbed sulfur oxides are passed through a bed of semi-coke before the activation to recover the sulfur oxides as elemental sulfur.

Process for dry desulfurization of flue gas

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Katsuta, Japan

Hajime Iinuma