| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of equipment for producing a coal water mixture(CWM), simplify the process and produce the CWM at a high concentration. SOLUTION: A coarsely crushed coal obtained by coarsely crushing a low grade coal together with 50-70 wt.% of water, (i.e., 30-50 wt.% of the coal concentration) is fed to a corundum mill 5 having a spacing between mutual opposite surfaces of a rotating disk 51 and a fixed disk regulated so as to provide, e.g. 1,000μm and wet grinding is subsequently carried out while controlling the maximum particle diameter to <=1,000μm. Thereby, a pulverized coal slurry having a wide particle size distribution is obtained. The resultant slurry is then modified with a modifying system and subsequently subjected to dehydrating treatment in a system for formation of the CWM. Water and a dispersing agent, etc., are then added to perform kneading and afford the product CWM.
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