改性污泥与无烟煤成浆性的研究

Co-slurryability of modified sewage sludge and anthracite

采用阴离子表面活性剂萘磺酸钠甲醛缩合物、聚羧酸钠作为分散剂,考察了不同污泥用量时污泥煤浆的成浆性能。结果表明,当污泥(干基)添加量为煤质量的4%时,成浆浓度超过60%,随着污泥用量的提高,污泥煤浆的成浆浓度降低。污泥加入后,浆体的稳定性增强,污泥比例越高,产生沉淀的时间延长。当污泥(干基)添加量为煤质量的4%时,产生沉淀的时间超过160 h,与使用稳定剂效果相当。使用不同添加剂制备的污泥煤浆均呈假塑性。污泥疏松的絮状结构,蜂窝状的外表面,强大的吸水性是造成污泥煤浆成浆浓度下降,稳定性增加的主要原因。

The co-slurryability of anthracite and modified sewage sludge has been investigated with two dispersants of naphthalene sulfonate sodium formaldehyde condensate and sodium polycarboxylate. The results show that co- slurryability concentration is higher than 60% while the mass ratio of dry sewage to coal is lower than 4： 100. With increasing the mass ratio of dry sewage, co-slurryability concentration decreases. The stability of coal-water-sewage slurry becomes better than that of coal-water slurry. When the ratio of dry sewage to coal is 4： 100, the period of stability is more than 160 h, similar to the coal-water slurry with stabilizer B. Coal-water-sewage slurry is pseudoplastic fluid and favorable to transportation. The loose floccules characteristic, honeycomb surface and great adsorption ability of sewage play the key role in improvement of concentration, stability and rheology of the coalwater-sewage slurry.