SU1570742A1 - Method of electroosmotic dewatering - Google Patents

Abstract

The invention relates to electrostatic dewatering and allows for an increase in the productivity of the process. The method involves treating the material with a direct current on which impulses of direct current are applied. 1 tab., 7 Il.

Description

The invention relates to the electroosmotic dehydration of wet particulate materials and can be used to dehydrate enrichment products, suspensions, clays, silts and other materials with a high content of bound water.

The purpose of the invention is to increase the productivity of dehydration.

A constant current is applied to the electrodes on which current pulses are applied. The DC voltage is 20 V, and the pulse amplitude is 50 V at a pulsation frequency of 1000 Hz. At the same time, as the product dehydrates, the DC voltage increases to 50 V. The voltage increases are dependent on the intensity of moisture release.

The moisture content of the finished product is 33.4%, in the known method 80%.

Fig. 1 shows a dewatering circuit that includes an anode 1, a material 2 to be dehydrated, a cathode 3 and 4, a filter material 5.

The intensification of the productivity of the process is achieved by sharing the direct current with the imposition of direct current pulses on it by any form of pulse.

The table shows the results of the study of the process of electroosmotic dehydration of the ratio L: T 1: 4 with various forms of current with the same values of parameters such as frequency, duration and amplitude of the pulse.

The results given in the table show that the process productivity increases regardless of the form of the applied pulse current.

Taking into account that the current pulse energy is calculated as the area given in the diagram of a geometric figure formed by the signal curves for the period and the x-axis, it can be concluded that the current pulse shape shown in Fig. 7 takes the smallest area while maintaining high process performance.

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An analysis of the results given in the table makes it possible to conclude that a certain value has the transition of the current value from the minimum to the peak value. Thus, the sinusoidal increase and instantaneous spas of the magnitude of the current (Fig. 7) made it possible, compared to the current pulse forms with a straight linear rise (Fig. 4) and a smooth decrease (Fig. 5), of the magnitude of the current, to increase productivity only by 0.2 t / h. Based on this, it can be concluded that the current magnitude transition

from minimum to peak value is not essential for this process.

Claims (1)

Claims of the method of electroosmotic dehydration of wet dispersed materials, including the treatment of the material with an electric current, differing from the fact that, in order to increase the productivity of dehydration, the process is conducted on direct current, which is superimposed by direct current pulses. Comparative results of electroosmotic filtration in a developed and known manner. Way Conditions of experience n Amplitude of the positive half-wave 25 times more than negative 13.2 Amplitude of the positive half-wave 100 times more than negative 13.8 Current pulse shape: Rectangular (FIG. 2) 18.4 With instant duration (fig.Z) 15.4 With a rectangular rise of the front (Fig. 4) 18.0 Trapezoidal (Fig. 5) 17.8 With a sinusoidal rise and a smooth decline of the front (Fig. 6), 18.0 С with a sinusoidal increase and an instantaneous decline of the front (Fig.7) 18.2 1 Productivity, t / h kteb INNE SHSHIV ™ RII and Children fWrW 2 Fig 3 mm Fy I | A & JLF DD kAbU | UU IS  “W“. Ynp p tang to WflilnnwIlWW l ffiMnk (Muiiii 1shmsh    w qi w mm schl well ah IW9l mmfnV9№iBf№ || imll mMR Figure 5 Sh ът whether.  m .... MCM Mffii 0 shshm msh mm mm shshmshsh dtttshtsht Wft. ™ WW YAICH BR YAI ffll HP "MISHCHNOYI Msh Phage. b