碱改性城市污泥-煤的成浆性能

发布时间：2018-11-05 19:57

【摘要】：为解决污泥与煤掺混制浆时存在浓度低和掺混量少等问题,本文将污泥干燥基质量20%的Na OH粉末与污泥均匀混合以对其进行改性,并用改性前后的污泥分别制备污泥-水煤浆,采用红外光谱仪、SEM扫描电镜和表面Zeta电位对样品进行表征,考察了改性对污泥结构性质的变化及不同污泥及改性污泥添加量对成浆性能的影响。通过Na OH改性处理,得到的改性污泥表面含氧官能团含量下降,表面电负性增强,有利于成浆。结果表明,改性可以解决污泥-水煤浆浓度低和流动性差的问题,对比污泥-水煤浆,当改性污泥添加量为10%时,浓度提高了5.64%,流动性得到很大提高,表现为连续流动,稳定性也有明显改善。在满足污泥-水煤浆性能的条件下,提高了污泥的利用率,促进了污泥在水煤浆制备中的应用。
[Abstract]:In order to solve the problems of low concentration and low mixing quantity of sludge and coal, 20% Na OH powder of sludge drying base was mixed with sludge to modify the sludge. Sludge and coal water slurry were prepared from sludge before and after modification. The samples were characterized by infrared spectroscopy, SEM scanning electron microscope and surface Zeta potential. The effects of modification on the structure and properties of sludge and the effects of different sludge and the amount of modified sludge on the properties of sludge were investigated. The surface oxygen content of the modified sludge was decreased and the surface electronegativity was enhanced by Na OH modification. The results show that the modification can solve the problems of low concentration and poor fluidity of sludge coal water slurry. Compared with sludge coal water slurry, when the amount of modified sludge is 10, the concentration of modified sludge is increased by 5.64, and the fluidity is greatly improved. The flow is continuous and the stability is improved obviously. Under the condition of satisfying the performance of sludge and coal water slurry, the utilization ratio of sludge is improved and the application of sludge in the preparation of coal water slurry is promoted.
【作者单位】：中国矿业大学化工学院;江苏省煤基CO_2捕集与地质储存重点实验室;
【基金】：国家自然科学基金项目(51674256,51204179)
【分类号】：TQ536.1;X703

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