中国不同变质程度煤制备水煤浆的性质研究
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摘要: 在相同的制浆条件下，以中国煤种资源数据库为依据，考察了24种不同地区、不同变质程度煤制备成水煤浆的成浆性、流变性及静态稳定性。结果表明,山西阳泉、山东淄博石谷、河北下花园等煤种适宜制浆，这些煤的浆体质量分数均可达到66%以上，浆体呈假塑性流体，且煤浆产生软沉淀的静态稳定性均在15 d以上；山西潞安石圪节、安徽淮南、淮北石台等煤成浆性较好，稳定性在7 d左右，浆体呈胀塑性流体；山东枣庄八一、甘肃靖远红会、河南鹤壁等煤可达到较高的煤浆质量分数，浆体流变性及稳定性均较差，其他的煤则不适宜用于制备水煤浆。Abstract: 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.
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Key words:
- coal water slurry (CWS) /
- slurryability /
- rheological behavior /
- static stability
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