Co-slurry ability of dried sewage sludge and Shenfu coal
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摘要: 以萘系阴离子表面活性剂为分散剂，考查了污泥干燥条件和粒径对神府煤成浆性的影响。结果表明，将污泥干燥后再制浆，明显提高了污泥煤浆的成浆浓度；升高干燥温度，有利于提高污泥煤浆的成浆浓度。干燥温度对污泥的可磨性影响较大。干燥温度越高，干燥污泥可磨性越好，球磨的污泥平均粒径越小，制得的污泥煤浆表观黏度越低；温度高于105℃，污泥的可磨性无明显差别，污泥煤浆的表观黏度亦无明显变化。污泥粒径越小，颗粒越细，一定程度上提高了煤粉的堆积效率，使污泥煤浆的表观黏度降低。Abstract: The effect of drying condition and particle size of sewage sludge on its co-slurry ability with Shenfu coal was investigated with naphthalene condensate as dispersant. The results show that the concentration of coal-water-sewage (CWS) slurry is greatly improved when the sewage sludge was dried and milled before preparation of the slurry. It is beneficial to raise the concentration of CWS slurry with increasing drying temperature which has a great effect on particle size distribution. With increase in drying temperature the surface mean diameter of milled sewage sludge falls and the apparent viscosity of CWS slurry decreases. When the drying temperature is above 105℃, there is no obvious change of grindability of the dried sewage sludge and the apparent viscosity of CWS slurry. The smaller particles of sewage sludge improve the packing efficiency of coal to a certain extent, resulting in the apparent viscosity of CWS slurry decrease.
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Key words:
- sewage sludge /
- coal-water slurry /
- dry /
- co-slurry ability
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