Process for producing a coal-water slurry
AssigneeBabcock-Hitachi Kabushiki Kaisha
InventorsKazunori Shoji, Hirofumi Kikkawa, Hiroshi Takezaki, Yoshinori Ohtani
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Abstract
A process for producing a coal-water slurry of low viscosity and high coal concentration with a low specific energy and a good efficiency is provided, which process comprises wet-grinding coal by means of a wet vertical ring-roll mill in the presence or absence of a surfactant and recycling a part of the coal ground by the mill, as it is, without classifying it, to the mill through a splitter.
Claims21
A process for producing a coal-water slurry, which comprises wet-grinding coal by means of a wet vertical ring-roll mill and recycling a part of the coal ground by the mill, as it is, without classifying it, to the mill through a splitter and discharging the coal-water slurry.
A process for producing a coal-water slurry product, comprising:
- minimizing the power consumption for grinding coal to product said product, said product having a broad coal particle size distribution and a 50% to 80% by weight concentration of coal, by grinding the coal with water and a surfactant present in the amoount of 0.05% to 3% by weight based upon the weight of the coal in a wet vertical ring-roll mill to obtain a coal-water slurry, providing a splitter for splitting off a portion of said slurry before classifying the slurry and discharging the remainder of said slurry, and increasing the concentration of fine coal particles in said slurry by recycling said portion of said slurry to said wet vertical ring-roll mill;
- and
- separating the coarse particles from said discharged coal-water slurry by removing the coal particles having a size greater than aobut 300 to 1,000 .mu.m to obtain said coal-water slurry product.
Dependencies are inferred from the claim text.