Taiheiyo Cement Corporation

Kenichi Honma

Tetsuo Ogiri

Takayuki Kimura

Soichiro Okamura

Junichi Terasaki

Makihiko Ichikawa

Daisuke Sawaki

Yoshihisa Tanaka

Takuya Shindo

Souichirou Okamura

Shuuichi Harasawa

Koji Nomura

Yoshiaki Sakamoto

A cement clinker producing system, capable of providing a gas containing a carbon dioxide gas at a high concentration by increasing a carbon dioxide gas concentration for a part of an exhaust gas, includes a cyclone preheater to preheat a cement clinker raw material, a rotary kiln to burn the preheated cement clinker raw material so as to provide cement clinker, a calcination furnace to promote decarbonation of the cement clinker raw material, a clinker cooler to cool the cement clinker, a kiln exhaust-gas discharge passages to discharge an exhaust gas generated in the rotary kiln, a combustion-supporting gas supply device to supply a combustion-supporting gas having a higher oxygen concentration than air, a combustion-supporting gas supply passage to guide the combustion-supporting gas to the calcination furnace, and a calcination furnace exhaust-gas discharge passage to discharge a carbon dioxide gas-containing exhaust gas generated in the calcination furnace.

Cement clinker production system and cement clinker production method

To provide a device for removing radioactive cesium from waste material containing radioactive cesium, doing so at low energy and in a dependable manner. The removal devicefor radioactive cesium is provided with: a rotary kilnwhich is provided with a burnersupplying from the kiln outlet an organic matter Ocontaminated with radioactive cesium, and an inorganic matter charging portsupplying from the kiln inlet inorganic matter Scontaminated with radioactive cesium, and which is employed to burn the organic matter Otogether with the inorganic matter S; and a recovery device cooling tower, a cyclone, a bag filterfor recovering cesium that has volatilized in the rotary kiln. A drying/crushing device (dryer, crusher) for drying and crushing the organic matter Oprior to charging the radioactive cesium-contaminated organic matter to the rotary kiln can be provided. Additionally, a reforming/drying/crushing device (reformer, dryer, crusher) for reforming, drying, and crushing the inorganic matter Scan be provided. During burning of the organic matter Otogether with the inorganic matter S, a calcium source can be added as a reaction accelerant A to the rotary kiln.

Removal device for radioactive cesium

To provide a method and an apparatus for removing radioactive cesium from waste containing radioactive cesium at low cost. A radioactive cesium removal apparatusincluding: an incineratorfor burning an inflammable waste polluted with radioactive cesium; a suspension preheaterfor, with the combustion exhaust gas Gand a sensible heat of the incineration ash of a combustible C discharged from the incinerator, generating calcium oxide or/and magnesium oxide from a source of calcium oxide or/and a source of magnesium oxide, cyclones of the suspension preheater being arranged in multistages; a rotary kilnfor burning an inorganic substance S polluted with radioactive cesium together with the calcium oxide or/and the magnesium oxide and the incineration ash Dincluding the radioactive cesium; and collectorsfor collecting cesium volatilized in the rotary kiln.

Method for removal of radioactive cesium and facility therefor

A burned product containing 100 parts by weight of CS, 10 to 100 parts by weight of CAS, and 20 parts by weight or less of CA; a cement admixture prepared by grinding the burned product; and a cement containing 100 parts by weight of ground portland cement clinker and 5 to 100 parts by weight of a ground product of the burned product.

Cement admixture

Growing community of inventors

Chiba, Japan

Kenichi Honma