STUDY ON THE PROPERTIES OF COAL-SLUDGE SLURRY PREPARED BY LEAN COAL AND SLUDGE FROM COAL-TO-OIL PROCESS

摘要

The sludge from coal-to-oil process was hazardous to the environment and difficult to handle. In the present study, it wasrnmixed with lean coal to prepare coal-sludge slurry for seeking a safety disposal. The effect of sludge ratios on slurryability,rnrheological properties and stability of coal–sludge slurries has been investigated. Results show that the addition of sludgernimproved the stability of slurry and changes the slurry rheological model from the dilatant fluid to the yield pseudoplasticrnfluid. With the increase of sludge dosage, the pseudoplasticity became stronger. The addition of sludge also increasedrnthe slurry viscosity and reduced the maximum slurry concentration. As the sludge to coal ratio increased from 0 to 15%,rnthe maximum slurry concentration drops from 73.08% to 65.38%.