SU448875A1 - Disc Vacuum Filter - Google Patents

Description

The invention relates to disk vacuum filters and can be used to separate low concentrated suspensions in the coal, mining, chemical and other sectors of the industry.

A disk vacuum filter is known, comprising a bath with a stirrer, a hollow rotating shaft with filter discs fixed thereto and a distributor head.

The purpose of the invention is to increase the filter capacity and expand its field of application for treating more dilute suspensions by filtering the condensable slurry in a bath directly at the working surface of the filter discs. This is achieved by the fact that the proposed disk vacuum filter is equipped with additional filtering sections having a discharge collector and fixedly mounted between the filtering disks in the filtering zone. Moreover, the discharge manifold is located above the filter sections.

FIG. 1 shows the described filter; in fig. 2 is a section along A-A in FIG. one.

The filter contains a bath 1, in which the filter discs 2 are immersed, mounted on a hollow shaft 3 connected to the distributor head 4.

filtering are additional filter sections 6, recruited from the filter sectors of a smaller radius compared with the radius of the sectors of the filter disks. The cavities of the sectors of the filter sections 6 are communicated by means of diverting headers 7 to the cavity of the pipe 8 connected to the pulsator (not shown).

The filter works as follows. The initial suspension continuously enters the bath 1, filling it up to the height of the overflow device.

By means of the pulsator, through the exhaust manifolds 7 and the tube 8, the cavities of the filter sections 6 alternately communicate with the vacuum and compressed air lines.

When communicating with the vacuum, the suspension is separated, while a precipitate forms on the surface of the elements of the filter sections 6, and the filtrate is removed through collectors, a pipe and a pulsator.

Subsequent communication of sections 6 with a compressed air line under the action of the resulting reverse flow of the filtrate discharges sediment into the separated suspension, as a result of which the concentration of the latter increases. Moreover, the enrichment of the solid phase occurs predominantly of that part of the suspension, which is located directly at the working surface of the filter disks 2.

At the same time, the thickened slurry is finally divided into filter discs 2 continuously rotated by a hollow shaft. In this sector of the filter discs, the working zones of the filtration cycle are sequentially driven by the design of the distribution head: filtering and drying under vacuum, followed by stripping the sediment under the action of compressed air.

The separation of the thickened slurry is accompanied by a more intensive precipitate formation on the filter discs 2, which leads to an increase in filter performance.

In case of incomplete dispersion of the sediment discharged from the additional filtering sections 6, its individual lumps are lowered to the bottom of the bath and destroyed by the stirrer.

5, and the solid particles are evenly distributed throughout the volume of bath 1.

Subject invention

Claims (2)

1. Vacuum disk filter for separating low concentrated suspensions containing bath, hollow shaft with filter disks fixed on it, characterized in that, in order to increase filter performance, it is equipped with additional filter sections having a discharge collector and fixed between filter disks in the filtering zone. 2. The vacuum filter according to claim 1, wherein the discharge manifold is located above the filter sections. h