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