Babcock-hitachi Kabushiki Kaisha

Hitachi, Ltd.

Hiroshi Terada

Fumito Nakajima

Yukio Hishinuma

Hirofumi Kikkawa

Yasushi Muranaka

Hidetoshi Akimoto

Ryuichi Kaji

Hideo Kikuchi

Yoshinori Ohtani

Kazunori Shoji

Nobuyasu Meguri

Takeo Komuro

Masayasu Murata

A process for continuously and automatically producing a high concentration coal-water slurry having a uniform quality is provided, which process comprises always monitoring the viscosity, concentration, pH, particle diameter distribution and the like of the slurry, detecting the variations of the foregoing and adjusting the quantity of coal fed, the quantity of water fed and the quantities of a surfactant and a pH adjustor added to thereby control the specifications of the coal-water slurry to definite ones.

Process for producing a high concentration coal-water slurry

Mineral impurities can be effectively removed from coal by introducing oil droplets into an aqueous slurry of pulverized coal. Coal, which is lipophilic, attaches to the surface of the oil droplets and floats upwardly along with the oil droplets utilizing their buoyancy. On the other hand, mineral impurities, which are hydrophilic, are left in the aqueous slurry.

Process for removing ash from coal

Growing community of inventors

Hiroshima, Japan

Hiroshi Terada