Mitsui Engineering and Shipbuilding Company Limited

Taiheiyo Cement Corporation

Eco-logy Corporation

Mitsui Engineering & Shipbuilding Co., Ltd and Eco-logy Corporation

Toshiaki Murata

Kazuo Abe

Masamichi Kikuchi

Shinichiro Saito

Kazutoshi Sakurai

Kosuke Kimoto

Unburned carbon is efficiently removed from fly ash, and effective utilization of the fly ash and removed unburned carbon is attained. Water is added to fly ash to thereby obtain a slurry. A collector is added to the slurry, and shearing force is applied to the slurry and collector to thereby attain a surface modification. The mixture is subjected to flotation operation at which unburned carbon of fly ash is attached to froths and surfaced. The application of shearing force to the slurry and collector can be carried out by means of a submerged agitator whereby an agitation power of 0.7 to 10 kWh/mis applied per unit quantity of slurry. The fly ash concentration of the slurry is in the range of 3 to 50 wt. %, and the amount of collector added is in the range of 5 to 100 wt. % based on the amount of unburned carbon of fly ash. The unburned carbon separated by flotation can be used as fuel, and the fly ash (product) having its unburned carbon content reduced to 1 wt. % or below can be used as a cement mixing material or a raw material for production of lightweight aggregate.

Method of removing unburned carbon from fly ash

A photocatalyst module comprising a substrate, for example, a metallic substrate, a layer of a photocatalyst such as titanium oxide, and a protective layer containing lithium silicate provided between the substrate and the layer of a photocatalyst wherein the protective layer can sufficiently withstand the heat in a step for forming the layer of a photocatalyst by a flame spray coating method and can prevents oxidation and/or decomposition of the substrate is disclosed.

Photocatalyst reaction apparatus

A method comprising a first step for radiating ultraviolet rays of a short wavelength of 110 nm or longer, but shorter than 200 nm to the gas, for example, an air to be treated to generate ozone, a second step for radiating ultraviolet rays of a medium wavelength of 200 nm or longer, but shorter than 300 nm to the air treated in the first step to form active oxygen, and a third step for radiating ultraviolet rays of a long wavelength of 300 nm or longer, but shorter than 380 nm to the air treated in the second step to convert the active oxygen into oxygen molecule in ground state, at least the second and/or third step being conducted in the presence of a photocatalyst comprising particles of titanium oxide of an orthorhombic crystal system or particles of titanium oxide of an orthorhombic crystal system supporting fine particles of another metal.

Process and apparatus for purification of oxygen-containing gas

Growing community of inventors

Fujisawa, Japan

Toshiaki Murata