甲基纤维素对微细粒蛇纹石的絮凝作用及机理

The Flocculation Behavior and Mechanism of Methylcellulose to Fine Serpentine

通过沉降试验、溶解试验,吸附量测试和zeta电位测试,研究不同温度条件下甲基纤维素对微细粒蛇纹石的絮凝作用,并考察其作用机理。结果表明,温度对蛇纹石颗粒的沉降具有一定影响,高温条件下蛇纹石颗粒的热运动较快,沉降速度较慢。甲基纤维素对蛇纹石的絮凝效果受温度影响较大,在25℃时,甲基纤维素溶解在水中,通过氢键作用吸附在蛇纹石表面,吸附量较低,絮凝作用较弱,蛇纹石颗粒沉降速度较慢;温度为65℃时,甲基纤维素从溶液中析出,沉积在蛇纹石表面,吸附量较大,产生较强的絮凝作用,从而使微细粒蛇纹石沉降速度加快。

The settling behavior of serpentine using methylcellulose as flocculant has been studied and the mechanism has been discussed. The sedimentation results show that temperature has influence on the settling behavior of serpentine particles and the sedimentation velocity is more quickly at low temperature. Methylcellulose is a useful flocculant for the settling of serpentine but the flocculation effect of metbylcellulose is influenced greatly by temperature. When methylcellulose was added, large floccules formed and the sedimentation velocity of serpentine was more quickly at 65℃ compared to at 25℃. The reason is that methylcellulose has a critical solution temperature above which it become insoluble and strongly adsorbs onto the particles surfaces. The adsorbed reagent molecules are interconnection and make the particle form large flocs, which accelerate the sedimentation process.