Special fine filter for pickling line waste liquid treatment recovery system

Abstract

The invention discloses a special fine filter for a pickling line waste liquid treatment recovery system. The special fine filter comprises a shell, a filter cartridge, a cleaning device and a stirring device; the center of the bottom of the shell is arranged in an inwards-concave mode, and an inwards-convex pipe is formed in an inner cavity of the shell; the stirring device comprises an installation support, an air cylinder base, an air cylinder, a second motor base, a lifting frame, a supporting pipe, a sealing cover and an impeller; the installation support is arranged at the bottom of theshell; the second motor base is arranged in the installation support; a second motor is longitudinally mounted in the second motor base; a rotating shaft is connected to an output shaft of the secondmotor, vertically penetrates through an upper supporting plate, the supporting pipe, the sealing cover and a connecting pipe in sequence and is connected with the impeller in the filter cartridge; thewaste liquid in the filter cartridge is stirred through the impeller, so that the waste liquid in the filter cartridge accelerates to pass through the filter screen under the action of centrifugal force, the filtering speed of the filter cartridge is increased, and the filtering efficiency of the filter is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of waste liquid filters, and in particular relates to a special fine filter for a pickling line waste liquid treatment and recovery system. Background technique [0002] The pickling line is a technological process in iron and steel metallurgy, the purpose is to remove the scale on the steel plate for further rolling of the steel plate. During the pickling process, a large amount of iron oxide scale will fall off and form oxide scale precipitation in the acid solution. Because these waste liquids contain a large amount of heavy metal impurities, they will have a serious impact on the water quality environment, so the waste liquid needs to be filtered. Disposal is possible only after treatment. In the waste liquid filtration treatment equipment, it is necessary to filter the waste liquid through a filter in order to separate heavy metal impurities from water. At present, due to the multi-layer structure of ...

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Problems solved by technology

At present, due to the multi-layer structure of the filter screen and the combination of adsorbent and coagulant, the existing filter has a better filtering effect, but the filtering efficiency is very low. The main reason is that it mainly relies on automatic waste liquid filtration at present. If there is no external force, the waste liquid will filter out slowly in the filter element, and when it is filtered in this way, most of the waste liquid will easily deposit at the bottom of the filter element, which will affect the filtration efficiency of the filter; and because the waste liquid The heavy metal impurities in the filter will stay on the inner wall of the filter screen when filtering, which will cause the blockage of the filter screen and greatly affect the filtration efficiency of the filter. However, the backwashing device in the existing filter cannot effectively remove the intercepted Impurities on the filter screen, the removal effect is uneven, and the ability to remove impurities is limited

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