PROCESS FOR THE PREPARATION OF A SUSPENSION OF SOLIDS AT HIGH CONCENTRATION

摘要

"PROCESS FOR THE PREPARATION OF A SUSPENSION OF SOLIDS AT HIGH CONCENTRATION" A suspension of solids at high concentration, in particular of highly concentrated coal in water, is prepar ed by submitting the solid to be suspended in the liquid to two wet milling operations, preceded by a preliminary grinding (crushing). The solid granulated up to a maximum size of 6 mm is micronized by wet milling in a first mill, into which it is fed together with water and suspension-stabilizing additives, the weight ratio between the solid and water being comprised within the range of from 35/65 to 60/40, it preferably being 51/49. The additive content is comprised within the range of from 0.3% to 3% by weight relatively to the solid. The aqueous suspension containing the solid micronized down to a maximum size of about 20 .mu.m is used as diluent medium in a second mill, into which is fed a charge con stituted by crushed solid and by the above mentioned aqueous suspension, the weight ratio between the above mentioned aqueous suspension and the granulated solid being comprised within the range of from 46/54 to 75/25, it preferably being 51/49. The milling in the second mill allows a suspension 2. to be obtained, wherein the average size of the micronized solid is substantially unchanged and the product obtained does not require further mixing or water separation stages in order to obtain the suspension at the desired concentration.