超声处理条件对水煤浆浆体各性质的影响

EFFECT OF ULTRASONIC TREATMENT ON PROPERTIES OF COAL WATER SLURRY

选择了大同、兖州、红会、八一及神木等五种煤样（其浆体流变特性呈胀性流体、静态稳定性较差）。系统地考察了超声处理时间及超声强度对各煤浆浆体的流变特性、静态稳定性以及成浆性的影响。实验结果表明，在一定的超声条件下（超声处理时间２～１０ｍｉｎ、超声强度４０Ｗ／ｃｍ２～８０Ｗ／ｃｍ２、超声频率２０ｋＨｚ），随着超声处理时间和超声强度的增加，五种煤的浆体都由胀性行为向屈服假塑性方向转化，浆体静态稳定性由几ｈ可以提高到一个月！另一方面，添加剂的浓度为１％时（按干基煤含量计），超声处理导致各浆体表观粘度略有上升。粒度分析结果表明，超声处理使得细煤粒的比例明显增加，超声引起浆体性质变化的原因至少部分是由于粒度分布的变化所致。

The effect of ultrasonic treatment on the properties of coal water slurry (CWS), such as slurryability, rheological behavior and static stability, were investigated The ultrasonic intensity was varied from 40W/cm2 to 80W/cm2 and treatment time from 2 to 10 min Ultrasonic treatment markedly improved both rheological behavior and static stability of CWS, but it caused a slight increase in the apparent viscosity of CWS The analysis of coal particle size distribtuion indicated that ultrasonic treatment resulted in a higher proportion of fine coal which benefits to improve the rheological behavior and static stability of CWS