SU1756411A1 - Filtering fabric - Google Patents

Abstract

Use: for dewatering iron ore concentrates during ore dressing. SUMMARY OF THE INVENTION: The filter fabric is made with a fine-weave interlacing, forming a fine-grained surface with embossed transverse and oblique cuts, developed by combining single and group overlaps of the base and weft with changing their direction through two threads. The system of weft yarns is smooth, non-shrink, elastic properties, non-hygroscopic nylon monomiths in the ratio of 10-14% by weight of the fabric, the main yarn system is polyamide multifilament yarn. The open porosity of the tissue is in the range of 4.2-4.3%. 2 Il. cl

Description

The invention relates to filtration and can be used in the beneficiation of ores, in particular, in the dehydration. iron ore concentrates.

The known filter fabric contains yarn from staple polyamide fiber, and based on heat-resistant complex high-filament yarns.

This fabric is intended for dry filtration, for example gas cleaning, and cannot be used in wet filtration.

The known filter cloth is used to filter the products of mining chemical raw materials and consists of basic synthetic monofilaments and weft synthetic multifilament yarns.

However, its inherent properties, such as excessively high air and water permeability, rigidity on the basis, make it difficult to use on vacuum filters for dehydration of iron ore concentrates.

Closest to the present invention is a filter fabric made from polyamide complex yarns in the warp and weft with a twill weave of 2/2 with an open porosity of 3-3.5% and used to dewater magnetite iron ore concentrates.

The disadvantage of this fabric is that during operation it mechanically clogs deposits from the concentrate and is mineralized by highly dispersed particles from the ore suspension without restoring the filtering properties by regeneration with compressed air and goes away.

Vj

sl o

four

much earlier than it wears out physically, it has a short lifespan (200-250 hours).

The aim of the invention is to improve the performance of the filter fabric by intensifying the process of dehydrating iron ore concentrates and increasing the service life.

The fabric contains interwoven polyamide main and weft threads with the formation of rectangular pores along the main threads. Each of the weft yarns is caprone, and the content of the weft yarns in the fabric is 10-14 wt.%. The fabric is made by small-patterned interlacing on the basis of linen and rep with the formation of relief transverse and oblique scars. The open porosity of the tissue is between 4.2-4.3%.

FIG. 1 is a schematic representation of a fabric; in fig. 2 - interlacing pattern.

From FIG. 2, it can be seen that the first and fourth weft yarns pass alternately above the main thread, then below it. The second and third weft yarns are run in pairs alternately with a shift in two strands, either under the two main strands, or above them. Similarly, the first and fourth main threads pass alternately either above the weft yarn, then under them, and the second and third - in pairs, then over two weft yarns, then under them.

Such an arrangement of the main and weft threads ensures the formation of a fine-grained weave with the fine-grained texture of the fabric surface. The cross and oblique scars have short overlaps of the yarns on the base and weft, so that a strong bond between the threads is achieved, which allows to obtain a more uniform compact structure of the fabric, which does not allow spreading, folds and distortions on it, provides a layer of sediment and its strong consolidation, drying and effective unloading, as well as partial regeneration of tissue with compressed air.

Under production conditions, the fabric was produced on a STB-2-175 weaving loom with an eccentric shedding mechanism using a base

complex polyamide yarns with a linear density of 29 tex x 4 with a twist of 120 kr / m and in a duck nylon monofilaments of diameters 0.2 mm.

Preservation of open porosity in the range of 4.2–4.3% makes it possible to improve the basic parameters of the fabric — water and air permeability, which intensify the dehydration process, and the use of non-hygroscopic, non-shrinkable

monofilaments, taken in the amount of 10-14% by weight of the fabric, to obtain a less shrinkable fabric that maintains the size stability.

In comparison with the prototype, the fabric reduces the consumption of materials by 40-43 g / m2, reduces the moisture content of the dehydrated sludge by 0.2%, the specific consumption of filter cloth by 0.004 m2 / t, and increases the service life by 30-40%. the cloth

Claims (1)

it is elastic, possesses sufficient wear resistance, enters operation mode from the first hours of operation. Since the monofilament is located across the width of the fabric (by duck), it is convenient when opening covers that, when equipped with vacuum filters, are worn on the sectors easily and freely. Claims of the invention: A filter fabric containing interwoven polyamide core and weft yarns to form 1 rectangular pores along the main threads, characterized in that. in order to improve performance by intensifying the process dewatering iron ore concentrates and increasing the service life, each of the weft yarns is nylon monofilament, the content of weft yarns in the fabric is 10-14 wt. headbands, and the open porosity of the tissue is in the range of 4.2–4.3%. A W} K Tw TCHGch $ j # 5 kfl -1   gp I L bvt., /. ““. / / XX1 G, f t / , -sS ///; i -f-х /, -Y / :; “- v. / l-,:      k l h y Vcl f.-J L-: l V R wrm 7 b 5 4 rgo mercury . 4J-J, P., i.f- | 4: xbj-; te rti.LJ5Od 0 1o / 61o / o o)% o oXo oovojg ЈiЈ / 6 t & oj & o Phage. 2 FIG. I