中国不同变质程度煤制备水煤浆的性质研究

In this paper, the slurryability (the concentration of slurry that has the apparent viscosity of 1 200 mPa·s at shear rate of 28.38 s－1), rheological behaviour (represented by flow index), and static stability (showed by the days of formation of soft sediment) of coal water slurry prepared from 24 Chinese coals from different districts with different coal ranks from lignite to anthracite were investigated. Sodium naphthalene sulfonate formaldehyde condensate was selected as the dispersant The testing results indicate that the slurries prepared from six coals of FF、KL、XW、XHY、WL、YM have higher slurryability up to 66% and better static stabilityof about 15 d. Their rheological behaviour of slurries exhibits pseudo-plasticity. It is found that higher slurry concentration with static stability of 7 d can be obtained from three coals of SGJ、HN、ST, but their rheological behaviour of slurries shows dilate-plasticity. The slurries prepared from the coals of BY、HH、HB had higher slurryability but poor rheological behaviour and static.