Process for the preparation of aqueous solid-fuel slurries by realizing an optimum granulometric distribution.

摘要

Raw coal ground to a particle size range of 0-15 mm feeds a mill B1 in the presence of water. The ground product is screened through a screen C and the undersize material forms the coarse fraction of the final mix. The oversize material employed to constitute the middle and fine fractions is ground in B2 and screened and then feeds a first hydrocyclone HC1 whose overflow (5) feeds a second hydrocyclone HC2. The fines recovered in the underflow (4) from HC1 and in the overflow (7) from HC2 constitute a second constituent of the final mix. The excess of the coarse material originating from the underflow of HC2 is ground in B3 into ultrafine particles which form a third constituent of the final mix. Fuel suspensions with a solids content of more than 45%, suitable for conveying and use. <IMAGE>