Process for producing an aqueous high concentration coal slurry

Details Process for producing an aqueous high concentration coal slurry Process for producing an aqueous high concentration coal slurry

1994-08-01

1997-02-04

Medley, Margaret

Fuel and related compositions

Solid carbonaceous fuel dispersed in a liquid medium

C10L 132, B02C 1700, B65G 5330

Patent

active

055993567

ABSTRACT:
An aqueous high concentration coal slurry having a high dispersion stability is produced by a process in which a coal material is wet pulverized at a low concentration in a dispersing agent-free aqueous medium, the resultant coal slurry is hydrated, the dehydrated coal cakes are mixed with an aqueous dispersing additive solution to provide an aqueous coal slurry (A), a portion (B) of the slurry (A) is further pulverized, and the pulverized portion (B) is mixed with the remaining portion (D) of the slurry (A), or by a process in which a coal material is pulverized in an aqueous dispersing agent solution to provide a slurry moiety (E), separately a cake moiety (E) is provided, the slurry moiety (E) is mixed with the cake moiety (E) the above-mentioned process being carried out to an extent such that the resultant coal slurry contains coal particles having a size of 5 .mu.m or less in a content of 15% by weight or more and coal particles having a size of 500 .mu.m or less at a particle size distribution in which a variation coefficient C in size of the coal particles is 0.3 to 0.75.

REFERENCES:
patent: 4305729 (1981-12-01), Stearns
patent: 4465495 (1984-08-01), Scheffee
patent: 4494959 (1985-01-01), Funk
patent: 4613084 (1986-09-01), Takamoto
patent: 4706891 (1987-11-01), Nakaoji
patent: 4746325 (1988-05-01), Nakamura
patent: 4756720 (1988-07-01), Kikkawa
patent: 4762526 (1988-08-01), Funaji
patent: 4786289 (1988-11-01), Shoji et al.

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