Kawasaki Jukogyo Kabushiki Kaisha

Sumitomo Heavy Industries, Ltd.

Electric Power Development Co., Ltd.

Kaoru Aoki

Shoichi Takao

Hayami Ito

Shuhei Tatsumi

Takashi Watanabe

Takashi Kuwabara

Kunizo Shinano

Nitaro Suzuki

Takayuki Ogawa

Mitsugu Kamao

Kazuhiko Nakaoji

Hideaki Ito

Naokazu Kimura

Masazumi Ito

The present invention relates to a process for preparing a coal-water slurry comprising the steps of screening coal into a coarse-grained coal and a fine-grained coal; subjecting said coarse-grained coal to gravity classification to classify into a low ash coal, a middle ash coal and a high ash coal; wet grinding a mixture of the fine-grained coal, the middle ash coal and part of the low ash coal, and subjecting same to flotation; preparing a first slurry having a solid concentration of 40-60 wt. % from the low ash froth resultant from flotation; and mixing another part of the low ash coal with this first slurry and wet grinding this mixture. This process can accord the solid concentration of the product slurry with an optional target value by adjusting the amount of the low ash coal mixed with the first slurry, and can use the remaining low ash coal not to be added to the first slurry for the purpose of preparing the second product slurry.

Preparation of deashed high solid concentration coal-water slurry

This process, which comprises subjecting coal to gravity classification to classify into a low ash coal, a middle ash coal and a high ash coal; deashing the middle ash coal by flotation; and using the deashed middle ash coal together with the low ash coal as the materials for producing a coal-water slurry, provides a low ash content and high solid content coal-water slurry in a high coal recovery as well as economically. This coal-water slurry is able to handle, store and burn as are fuel oils.

Growing community of inventors

Hiratsuka, Japan

Kaoru Aoki