Preparation of deashed high solid concentration coal-water slurr

Details Preparation of deashed high solid concentration coal-water slurr Preparation of deashed high solid concentration coal-water slurr

1985-11-15

1987-12-15

Goldberg, Howard N.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 21, 241 24, 241 29, 44 51, B02C 1912

Patent

active

047127422

ABSTRACT:
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.

REFERENCES:
patent: 3596839 (1971-08-01), Putman
patent: 4132365 (1979-01-01), Verschuur
patent: 4265407 (1981-05-01), Kessler et al.
patent: 4593859 (1986-06-01), Nakaoji et al.
patent: 4598873 (1986-07-01), Cleemann

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