To
shorten the testing duration on the static stability of a coal
water mixture (CWM), the temperature was selected as an acceleration
factor and its influence on the static stability of the CWM was studied
quantitatively and objectively using a Turbiscan Lab analyzer. Moreover,
the apparent viscosity and variation of the particle mean diameter
were tested to elucidate the effect of the temperature on the static
stability of the CWM. The results showed that the increase in the
temperature caused more dispersant adsorbed onto the coal surface
and contributed to the increase of pseudo-plasticity and decrease
of apparent viscosity of the CWM; meanwhile, the particle mean diameter
gradually increased. The changes of these slurry properties facilitated
particle settling and, therefore, deteriorated the static stability
of the CWM. Furthermore, the effect of the temperature on the apparent
viscosity and variation of the particle mean diameter was fitted well
by the Arrhenius equation. According to this, a prediction model on
the static stability of the CWM was established. From this model,
the acceleration ratio (AR) could be calculated, which was consistent
with the data of the water-bleeding ratio (WBR) measured by the Turbiscan
Lab analyzer from the macroscopic perspective. Therefore, a rising
temperature is a feasible way to rapidly, quantitatively, and accurately
evaluate the static stability of the CWM.
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