Ishikawajima-harima Jukogyo Kabushiki Kaisha

Chichibu Cement Kabushiki Kaisha

Kabushiki Kaisha

Chichibu Engineering Kabushiki Kaisha

Toshikazu Ichiyanagi

Shoji Sekine

Hiroshi Teshigawara

Zenzaburo Kawai

Kanzaburo Sudo

Yasuo Komatsu

Tamotsu Negishi

Keisuke Ogawa

Kanzaburo Suto

Satoru Higuchi

Kanzaburo Sudoh

Nobuhiro Yamazaki

Masaharu Kikuchi

Hiroshi Yokomizo

Upper and lower vortex chambers are disposed immediately below a calcining furnace for calcining powdery raw materials. The scattering clinker particles from a fluidized-bed burning furnace are trapped in the lower vortex chamber and are returned to the fluidized-bed burning furnace so that the scattering clinker particles are positively prevented from flowing into the upper vortex chamber and the calcining furnace.

Calcination apparatus for use in fluidized-bed burning installation for

According to the present invention, white cement clinker particles are not burned in a rotary kiln and the burned clinker particles are not immersed in the water to be cooled. White cement clinker raw materials are burned in a fluidized bed burning furnace with a fluid bed or a spouted bed and the clinker particles thus burned are reduced with a reducing gas. The clinker particles thus reduced are first cooled with the water which is sprayed over the clinker particles and then further cooled with the air. The white cement clinker raw material particles fed into the fluidized bed burning furnace are burned into clinker particles while forming a fluidized bed and then the clinker particles thus burned drop through a jet injection pipe into a reduction chamber disposed below the burning furnace and are reduced. The clinker particles thus reduced are rapidly cooled to 600.degree.-700.degree. C. with the sprayed water while being isolated from the surrounding atmosphere in a primary cooling chamber and the clinker particles thus cooled are further cooled in a secondary cooling chamber with the air to 100.degree.-150.degree. C.

Method for producing white cement clinker

Method and apparatus for producing white cement clinker

Disclosed is an apparatus for calcining raw materials in the form of powder or particles. The gases entrain the particles to spiral upward in the calcining furnace. In an upper throttle chamber the relatively coarse particles which have not been completely calcined are separated from the gas flow and returned into the calcining zone to be calcined again. This pattern of material flow is repeated several times. The calcining efficiency can be improved, so that the furnace can be made small in size. The uniformly calcined particles are discharged from the top of the furnace and introduced into one or more cyclone separators through an outlet duct including a 180.degree. bend section.

Apparatus for calcining raw materials in the form of powder or particles

Growing community of inventors

Kumagaya, Japan

Toshikazu Ichiyanagi