煤泥水磁化改性及磁化-絮凝沉降研究

Magnetization modification and pre-magnetization flocculation and sedimentation of slime water

为研究磁化作用对煤泥颗粒同种表面电荷（ζ电位）及表面水化膜的影响,以磁场强度和磁化时间为变量对煤泥水进行磁化处理试验。采用自然沉降、絮凝沉降、混凝沉降和预磁化-絮凝沉降等方法对煤泥水进行沉降处理,分析沉降特性,揭示煤泥水磁化处理作用机理。结果表明,在0.15~0.25 T磁场下预磁化2~3 min时,煤泥颗粒的ζ电位由30.5 me V降至20.1 me V,煤泥颗粒的表面水化膜明显减薄。混凝沉降与预磁化-絮凝沉降的沉降速度、尾泥高度均明显优于单纯的絮凝沉降,而预磁化-絮凝沉降在沉降速度、上清液透光率、尾泥高度等方面又优于混凝沉降,尾泥高度减少25%,煤泥水透光率达到82.2%。

In order to investigate the influence of magnetization on same surface charge（ ζ potential） of slime and surface hydration shell,the magnetization test on slime water was conducted taking magnetic field intensity and magnetizing time as variables. The slime water was clarified by natural sedimentation,flocculation,coagulation sedimentation,pre-magnetization flocculation and sedimentation method respectively. The sedimentation characteristics and magnetization mechanism were investigated. The results showed that,after being pre-magnetized for 2 minutes to 3 minutes under 0. 15 T to 0. 25 T magnetic field,the ζ potential of slime was decreased from 30. 5 me V to 20.1 me V,the thickness of surface hydration shell was reduced obviously. The sedimentation velocity and tailings height of coagulation sedimentation,and pre-magnetization flocculation and sedimentation were better than those of flocculation sedimentation. The sedimentation velocity,supernatant transmittance,tailings height were better than those of pre-magnetization flocculation and sedimentation. The tailings height decreased by 25%,the supernatant transmittance could reach 82. 2%.