CS264894B1 - Filter sorbent for bath cleaning - Google Patents

Abstract

The filter-sorption insert for cleaning baths consists of a filter fabric and a sorption component, the sorption component being a sorption nonwoven fabric, which has powdered activated carbon bound to the surface of the fibers by a binder, at least 87% of the particles of which have a size smaller than 40 µm. The sorption nonwoven fabric may be in the form of a roll, which can be created, for example, by rolling up strips of filter fabric and sorption fabric. The roll of sorption fabric may be created on the filter fabric.

Description

The invention relates to a filter sorption pad for cleaning baths, for example, galvanic or phosphating, of organic decomposition products, which impair, for example, the electroplating conditions.

For example, standard liners made of specially folded impregnated paper, embedded in softer PVC sealing faces, are currently used for galvanic bath cleaning. The pore size of these filter cartridges is 10 µm, and particles of 1 µm are collected after the cake has been washed and formed.

In addition, non-woven needles with melted surface and good filtration efficiency of 25-40 µm pore size are also used. They are designed to catch larger mechanical impurities. The formation of a filter cake from sludge containing smaller particle fractions is gradual.

For the removal of organic substances, for example, activated granulated charcoal is applied to the filter cartridges by deposition in the amount of 500 to 800 g, and it is recommended to apply it to the filter layer formed by deposition of asbestos.

The disadvantage of this method is the laborious preparation of the filter device for self-filtration, consisting in the preparation of the alluvial bath and its application to the filter element, the sorption layer of activated carbon formed on the filter element having a small height; that is, the flowing galvanic bath is only briefly in contact with the activated carbon, which negatively affects the rate of sorption and hence its efficiency, negatively affecting the pressure loss of the insert and hence the flow rate and performance of the filter device.

The object of the invention is to eliminate the above mentioned drawbacks of the state of the art as far as possible and to create a filter sorption unit meeting the requirements for higher sorption efficiency while maintaining utility properties, improving pressure loss and thus performance of the filtering device. inserts.

The aforementioned drawbacks are eliminated by a filter sorption pad for cleaning baths according to the invention, formed from a filter cloth and a sorption component, wherein the sorption component consists of a sorption nonwoven having powdered activated carbon bonded to its binder surface. than 40 winters. The absorbent nonwoven fabric may be in the form of a winding, wherein the winding may be formed by coiling the webs of filter fabric and sorption fabric. The sorption fabric can be wound up on the filter element.

Advantages of the filter-sorption cartridge for bath cleaning according to the invention are especially its simple construction, easy preparation of the filter cartridge, high sorption ability, high flow rate, while not affecting the pressure loss and thus the filtration device performance. layers.

Example l

The filter sorption pad is formed from a standard filter pad on which a sorption nonwoven fabric (formed according to AO 238 199) consisting of 2 fibers of polyester staple fiber having a basis weight of 36 gm, reinforced by spraying on both sides an aqueous dispersion of acrylic binder so that the final weight of the consolidated fiber-2 -2 formation is 55 g. m, of acrylate polyelectrolyte in an amount of 19 g. m and powdered activated carbon in an amount of 125 g.m in which at least 87% of the particles have a particle size of less than 40 winter -2 and an acrylate binder in an amount of 56 g. m.

Example2

The filter-sorption insert is formed from a non-woven filter insert in the form of a winding, with which a non-woven sorption insert formed from a fiber web of polyester is wound simultaneously.

F2 cuts with a basis weight of 32 g.m reinforced by bilateral spraying of an aqueous styrene acrylate dispersion 2 so that the resulting weight of the reinforced fleece was 40 g.m, of 33 g binder of styrene acrylate -2-2. m and acrylic sprays in an amount of 5 g.m and of powdered activated carbon in an amount of 72 g. m.

Example 3

The filter-sorption insert is formed from a 100% polypropylene staple nonwoven stitched nonwoven fabric with a weight of 700 gm (pore size approx. 250 µm retaining particles of 1 µm), in the form of a winding with which the sorption nonwoven fabric according to AO 138 199) see Example 1.

Example 4

The filter-sorption insert is formed from a non-woven fabric fused on both sides with 100% polypropylene staple fiber of 500 g.m. in the form of a package to which a sorbent nonwoven fabric (formed according to AO 238 199) is wound in at least one layer, see Example 1.

Claims (4)

A filter bed for cleaning baths, for example, galvanic or phosphating, formed from a filter cloth and a sorbent component, characterized in that the sorbent component is a sorbent nonwoven fabric having at least 87% powdered activated carbon bonded to the surface of its fibers. The particle size is less than 40 winters. 2. The filter-sorption pad of claim 1, wherein the sorbent nonwoven is in the form of a package. 3. Filter cartridge according to claim 2, characterized in that the winding is formed by the simultaneous winding of the webs of filter fabric and sorption fabric. 4. A filter cartridge according to claim 2, characterized in that the winding of the filter web is formed on the filter cartridge.