交联阳离子淀粉絮凝剂的制备及其对煤泥水絮凝性能的影响

Preparation of Cross-Linked Cationic Starch Flocculant and its Effect on Flocculation Performance of Coal-Slime Water

为更高效、更环保地处理煤泥水,制备交联阳离子淀粉絮凝剂,开展了煤泥水的絮凝沉降性能研究。采用扫描电镜(SEM)、X射线衍射光谱(XRD)以及傅里叶变换红外光谱(FT-IR)对所制备的淀粉、阳离子淀粉和交联阳离子淀粉样品进行表征分析,并以煤泥水为测试对象,考察了絮凝剂添加量、煤泥水浓度、离子浓度、煤泥水pH对煤泥水絮凝性能的影响。SEM、XRD以及FT-IR结果表明,阳离子单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)、醚化剂2,3-环氧丙基三甲基氯化铵(GTA)成功合成在淀粉骨架上,阳离子淀粉交联成功。将合成的交联阳离子淀粉与市售的阴(阳)离子聚丙烯酰胺进行对比,结果表明,交联阳离子淀粉在处理煤泥水后,浊度低、絮体压缩率高、pH适用范围广,且滤饼水分含量低。EDLVO理论分析表明,交联阳离子淀粉絮凝剂的添加明显降低了颗粒间的相互作用力,可促进微细颗粒聚集沉降。

In order to treat coal slime water more efficiently and more environmentally,based on the prepared cross-linked cationic starch flocculant,the influence on flocculation and sedimentation performance of coal slime water was studied.The prepared starch,cationic starch and cross-linked cationic starch samples were characterized and analyzed by scanning electron microscopy(SEM),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FT-IR).The effects of flocculant addition,slurry concentration,ion concentration and slurry pH on the flocculation performance of slurry water were investigated.SEM,XRD and FT-IR results showed that the methacryloyloxyethyl trimethyl ammonium chloride(DMC)and 2,3-epoxypropyl trimethyl ammonium chloride(GTA)were successfully synthesized on the starch skeleton,and the cationic starch was successfully cross-linked.Comparing the synthesized cross-linked cationic starch with the anionic(cationic)polyacrylamide sold in the market,the results show that the cross-linked cationic starch has a low turbidity,high floc compressibility,wide range of pH applications,and low moisture content of filter cake after treating the coal slurry water.EDLVO theoretical analysis shows that the addition of cross-linked cationic starch flocculant significantly reduces the interaction between particles,and can promote the aggregation and sedimentation of fine particles.