The fine grinding process which production manner null of carbon quality

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. 1,000 μm and wet grinding is subsequently carried out while controlling the maximum particle diameter to ≤1,000 μm. 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.;COPYRIGHT: (C)1999,JPO