SU1211224A1 - Electrode for electric flotation - Google Patents

Description

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The invention relates to the purification of natural and waste water electroflots and can be used in devices for flotation extraction of contaminants or useful components from a liquid.

The aim of the invention is to increase the efficiency of electroflotation by providing the possibility of obtaining fine bubbles of electrolysis gases.

FIG. 1 shows an electrode for electrolysis of a liquid; in fig. 2 - the same section.

The electrode has a conductive material 1, which on the working surface is divided by an insulating material (partitions) 2 into reaction 3 and insulating 4 zones. Insulating material 2 surround reaction zones 3 on all sides.

To obtain gas bubbles, the electrode is connected to one of the poles of the current source, and another electrode is connected to the other pole. Then the electrodes are placed in the working fluid and turn on the current. During electrolysis, on the reaction zones 3 of the electrode, which is located horizontally or at an angle not higher than 60 ° to the horizon, gas bubbles are formed, which float, and do not spill.

Example 1. As a conductive material for the cathode take wire dia: meter 30 microns. The reaction zones of this wire (i.e. zone size 30 μm) are separated by an insulating material. In the electrolysis of waste water, the size of homogeneous gas bubbles is 20-40 microns. On a flat electrode without dividing into cells under identical conditions, gas bubbles with a size of mainly 300-600 microns were obtained.

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PRI mme R 2. The surface of the conductive metal plate is divided into zones of 100x100 µm. Gas bubbles with a diameter of 80–5 150 μm (mostly 100–130 μm) were obtained. The area of the reaction zone in this case is 10 m and does not depend on the total electrode surface.

Example 3. The known electrode is made of 30 micron copper wire in the form of filaments. An electrode with reaction zoi of 30 μm is made from the same wire. When purifying water containing 290 mg / l of suspended solids, the residual content of the suspension using the proposed electrode is 27.3 mg / l, and using the known one — 35,; 4 mg / l, i.e. increase the cleaning effect when using the proposed electrode by 22.6%.

The smaller the size of the reaction zones, the higher the degree of purification from suspended substances. However, due to technological considerations for fabricating electrodes, the size of the reaction zones from below should be limited to 10 µm, and the upper limit to 1 mm, since large gas bubbles are formed when the area of the reaction zone is 1 mm.

The width of the insulation partitions should be at least half the width (or diameter) of the reaction zones, as otherwise there is a merging of separate small puffs into large ones.

Thus, the area of the reaction zones in relation to the unit area of the electrode is 25-45%, their number is 2500–49000 per 1 cm of the area of the electrode, the width of the dielectric partition is at least half the width of the reaction zone, and the ratio of their areas is not less than 1: 2.5-3.

VNIIPI

Circulation 865

Order 605/28 Subscription

Branch PIP Patent, Uzhgorod, Proektna St., 4

Claims (2)

1. ELECTRODE FOR ELECTROFLOTATION, containing a base of conductive material coated on a part of its surface with an insulating material, forming active and inert zones, characterized in that, in order to increase the efficiency of electroflotation due to the possibility of obtaining fine electrolysis gas bubbles, the area of the active zones is 25-45Z of the electrode area, and their number is 2500-49000 per 1 cm ^{2 of} the electrode area. 2. The electrode according to π. 1, characterized in that the width of the inert zone is at least half the width of the active zone. FIG. 1