PCT No. PCT/EP89/00487 Sec. 371 Date Feb. 28, 1990 Sec. 102(e) Date Feb. 28, 1990 PCT Filed May 3, 1989 PCT Pub. No. WO89/10790 PCT Pub. Date Nov. 16, 1989.The invention relates to a method for comminuting brittle grinding material. An overall economic optimization is required of methods performing only a single grain and material bed comminution in a first comminution stage. According to the invention the first comminution stage comprises precrushing the grinding material with a relatively well defined particle size, so that following stages can be designed for said particle size and consequently it is only necessary to have a lower specific energy requirement per grinding material quantity fed through.
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