SU317249A1 - MULTI-CHAMBER ELECTRODIALIZER - Google Patents

Description

The invention relates to the designs of multi-chamber electrodialyzers with ion-exchange membranes used for cleaning solutions, suspensions and slurries, electrolytes and non-electrolytes, etc. It can be used in the chemical industry, in non-ferrous and ferrous metallurgy, as well as in adjacent otrash x production.

A multi-chamber electroplasticizer is known, in which the main working element is a bag assembled from alternating anion exchangers and cation exchangers. Between them, sealing frames are placed in the brine and desalting chambers, ensuring the sealing of the membranes along the edges during the compression of the package. The space between the membranes, bounded by a sealing frame, is a working chamber. To prevent contact of the membranes, labyrinth or mesh type separators are placed in the working chambers. Separators may be integral with sealing frames. In this case, they are called separator gaskets, which seal the membranes along the edges and at the same time prevent their contact in the working chamber. In the separator gaskets and membranes there are matching holes that form the paths for input and output during assembly of the package.

solutions from electrodialysis chambers. Concentrating (brine) and desalting (dialysate) chambers are connected by channels in separator gaskets, respectively, with brine and dialysate tracts. To ensure that the membranes are tightly pressed against the gaskets, which is necessary to prevent overflows between the dialysate and the brine, the channels are narrow, with a small cross section. However, in this electrodialysis design, the path of movement of the solutions and the small cross section of the channels connecting the working chambers with the paths determine the flow of solutions

under high pressure, which increases energy costs and places increased demands on the mechanical strength of membranes and other elements. As a result of clogging of chambers and channels with the subsequent disruption of the process, the polluted solutions, especially suspensions and pulps, are not milled for processing. In addition, the outer walls of the bag are always wet due to lack of leaktightness, which complicates the conditions of anxiety from the point of view of safety engineering and industrial sanitation.

This bag is placed in, ensuring the continuous flow of the product in the desalting chambers. To ensure the integrity of the brine chambers, the upper and lower sides of the anionnthe and cationite membranes are welded nln and glued together, and the sides are compressed with seals; For the purpose of preventing the zibpv and to the package in the separator pads of the desalting chambers, the through channels are made, allowing for a continuous flow movement of the desalted product.

FIG. 1 shows an electrolanometer, buttitudinal section; in fig. 2 - elements of a package of ion-exchange membranes; in fig. 3 - brine tract in the assembly; in fig. 4 - senator assembly; in fig. 5 - senator made in the form of one piece.

The electrodializer consists of a housing / inside which a package of non-nitrite membranes 2 is compressed between the electrode plates 3. In the housing cover 4 / there is a nozzle 5 located above the receiving device 6. The latter is separated from the internal area of the cornus with a test mesh 7. Pat tooth 8 with adjustable bore. On the upper torn of the electrode plates, devices 9 are mounted for supplying voltage to the W electrodes. On the lower torn there are pit pipes for the brine and the electrode solution.

In the package, the cationite and anionntic membranes 11 are ionically bonded (glued, welded, etc.) on several sides, for example, on top 12 and on bottom 13, respectively, positions 11 and 12. Uncoupled sides (side) are compressed with sealing bands.

In the brine chambers there are spacer pads 14 and sealing washers 15 with channels 16 for the brine. In desalting chambers there are sealing rings / 7. The same openings 18 are located in the membranes, in the pilot shchibs and on the unlothelial rings, which, when assembled, combine to form a brine tract.

In the desalting chambers, senators are inserted, which are made (see Fig. 4) of longitudinal 19 and transverse 20 silvers with through channels 21 or are made in the form of one piece (see Fig. 5) with sealing seals 22 by casting, stamping, welding, and t . Section. Through channels in separators are located across the entire width of desalting chambers. Since longitudinal and pepper strips are not designed for -plug and do not carry mechanical ;; - loads, through channels in them are made with an increased cross-section, which allows the desaltable product to flow through the membrane membrane and with an insignificant loss of nioor.

The electrolyzer works as follows.

The solution to be desalted is iodine through the pipe 5 of the housing cover and through the grid 7 enters the upper part of the apparatus. Nrokhod pr mol1Ileipo through desalting chambers

package of membranes, the desalted solution is removed through the lower tube. The brine is fed through one of the nozzles at the end of the plate 3 and, irod brine chambers, is discharged through the other and the tubes. The level of the desalination solution in the apparatus is maintained above the upper edge of the membrane in order to create an excess pressure from the desalting chambers with respect to the brine and electrode chambers. ND voltage

direct current to the electrodes occurs electrolyte electrolyte transfer from the desalting chambers to the brine.

The use of the proposed electrodialyzer will allow the use of an electrodialysis process without prior purification for the processing of contaminated solutions, suspensions and pulses, which are typical intermediate and waste products in hydrometallurgical processes, enrichment,

Tsvetpy ferrous metallurgy.

N e m u t inventions

1.Multi-chamber electrodialyzer with a package of alternating anionic and cationite membranes, separator gaskets, sealing membranes and preventing them from replenishing in chambers, and electrodes in extreme chambers, characterized in that, in order to isolate the package of membranes from the surrounding space and lightweight processing contaminated solutions

suspension and slurry, the indicated nacket is placed in the housing, which provides for the continuous flow of the product in the desalting chambers.

2. Elektrodializator for and. 1, characterized in that, in order to ensure the integrity of the brine chambers, the upper and lower sides of the ion-exchange and cation-exchange membranes are welded or glued, and the sides are compressed with sealing elements.

3. Elektrodializator for np. I and 2, characterized in that, in order to prevent the clogging of the bag, through channels are provided in the separator pads of the desalting chambers, which ensure the continuous flow of the desalted product.

1 Desalted npodt / f (m. /

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Fig 3

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