碱改性城市污泥-煤的成浆性能

Effect of alkali-treated sludge on sludge-coal water slurry performance

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。

In order to improve the addition of sludge and sludge coal water slurry concentration,sludgewas mixed with NaOH powder(mNaOH∶msludge drying=1∶5)to modify its quality.The sludge-coalwater slurry(CWS)was prepared with the sludge and modified sludge,respectively,and the effectsof modification on the properties of the sludge and different additions on the slurry properties wereinvestigated by Fourier transform infrared spectrum(FTIR),scanning electron microscope(SEM)andsurface zeta potential.The content of oxygen-containing functional groups on the surface of modifiedsludge decreased and the surface electronegativity was enhanced by being modified on sludge afteralkali-treated,which had an advantage on slurry.Sludge modification can solve the problem of the lowconcentration,poor fluidity and stability of CWS.Comparing with sludge-CWS,results showed thatwhen the amount of modified sludge addition was10%,the concentration increased by5.64%andfluidity improved greatly.Stability was also improved significantly.Under the condition of satisfyingthe performance of sludge-coal slurry,the utilization rate of sludge was improved and the applicationof sludge in coal slurry preparation was promoted.