| 摘要 |
A process for preparing a suspension of a powdered carbon- containing material having a predetermined particle size distribution, with a given mean particle size and a given maximum particle size, is described. The process, which involves a comminuting phase comprising at least two grinding steps and combining the ground material with a carrier liquid in order to form the suspension, is characterized by the following steps: (a) the carbon-containing material is ground in a first grinding step, (b) the ground product from step (a) is divided into coarse material having a particle size which is at least greater than the mean particle size of the predetermined particle size distribution, and into fine material which has a particle size which is less than the size of the coarse material, (c) the coarse material from step (b) is ground in at least one further grinding step in order to prepare at least one further portion of fine material whose mean particle size is less than the mean particle size of the final suspension, and (d) a suspension of the combined portions of fine material from the different steps is prepared.
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