Study on trial for making a continuous-type electroosmotic dewatering apparatus of solid-liquid mixutures under an electric field applied efficiently

本文介绍了一种电渗透脱水实验装置，该装置能连续地除去在两个垂直圆柱形电极之间的通道中重力流下的浆料中的水分。脱水体基本上由三个垂直的长圆柱体组成，两块多孔不锈钢板各组成一个锥形长圆柱体，两个圆柱体分别作为电极和过滤介质。液压压缩压力自然地施加到在电极圆筒之间向下流动的浆料，以保持浆料和电极之间的良好接触。同时通过供电器向浆料施加具有电极极性的周期性反转的直流电场或交流电场。然后，浆料可以水平地脱水到两个圆柱形电极的内部和外部。通过混合粉末颗粒和去离子水来制备浆料。将浆料在室温下搅拌2h。 关于我们 浆料槽进行均质化，然后通过使用浆料泵将浆料供给到上述脱水体中。电场如连续直流电，对在脱水体中向下流动的泥浆施加一次极性反转的直流电和改变频率和波形的交流电。使用该连续型电渗脱水装置，通过改变施加电压、浆料材料和浆料进料来进行实验。通过实验研究得到了如下结果：1.对于重力几乎不脱水的膨润土浆液，直流电场作用下浆液的脱水几乎仅限于圆柱形电极的外侧。另一方面，在直流电场作用下，电极极性反转一次，浆料在电极内外同时脱水，排水量比连续直流电场增加.在交流电场的情况下，排水的流量显示出随着频率的降低而增加的趋势，无论波形如正弦和矩形。向电极内侧和外侧的排出流速分别几乎相同，交流操作在该装置中产生有效的电渗透脱水。少

An experimental apparatus for electroosmotic dewatering which can remove continuously the water in slurry flowing down gravitationally in a passage between two vertical cylindrical electrodes was made for trial. The dewatering body basically consisited of triple vertical long cylinders, and two porous stainless-steel plates were each formed long tapering cylinders and both of the cyliders were used respectively as electrodes and filter media. Hydraulic compressive pressure was naturally applied to the slurry flowing downwards between the electrode cylinders, in order to keep well contact between the slurry and the electrodes. A D.C.electric field or an A.C.electric field with periodical reversals of electrode polarity was applied to the slurry by an electric supplier at the same time. Then the slurry could be dewatered horizontally to both inside and outside of the two cylindrical electrodes. Slurry was prepared by mixing powder particles and deionized water. The slurry was agitated in … More a slurry tank to homogenize, and then the slurry was fed to the above-mentioned dewatering body by using a slurry pump. Electric fields such as continuous D.C., D.C.with reversing electrode polarity once, and A.C.with changing frequency and wave form were applied to the slurry flowing downwards in the dewatering body. Using this continuous type electroosmotic dewatering apparatus, experiments were performed by changing applied voltage, slurry material, and slurry feed. The results obtained by the experimental investigations are summarized as follows :1. For bentonite slurry whichi was hardly dewatered gravitationally, the slurry under D.C.electric field was dewatered alomost only to the outside of cylindrical electrode. On the other hand, the slurry under D.C.elecric field with reversing electrode polarity once was dewatered to both inside and outside of the electrodes, and then the flow rate of drained water was increased compared with the continuous D.C.electric field.2. In the case of A.C.electric fields, the flow rate of drained water showed a tendency to increase with decreasing the frequency, regardless of wave forms such as sine and rectangular. The drained flow rates to the inside and outside of electrodes were almost the same respectively, and A.C.operation gave an effective electroosmotic dewatering in this apparatus. Less