Steel rolling alkali wash water filtering and recycling system

Abstract

The invention discloses a steel rolling alkali wash water filtering and recycling system which adopts oil removing, coarse filtering, fine filtering, concentrating and dewatering and deslagging and is characterized in that a sloping panel oil separating groove of which the upper part is provided with a chain type oil scraping device and the lower part is provided with a slag settling taper hopper is adopted in oil removing; a self-cleaning filter is adopted in coarse filtering for intercepting large-particle impurities to prolong the backwashing period of a microfilter unit; a micropore filtering device is used in fine filtering and is internally provided with a compound micropore filter core; settled slag in the sloping panel oil separating groove, drained sludge in the self-cleaning filter and drained sludge in the microfilter unit are integrally collected to a waste alkali water storage tank for carrying out secondary concentration; and the concentrated waste slag in the waste alkali water storage tank is dewatered by a plate frame filter press or centrifugal dehydrator, and then conveyed outside by a slag car. The steel rolling alkali wash water filtering and recycling system has the advantages of good oil removing effect, high filtering precision, clear filtered liquid, no change of properties, concentration and other physicochemical properties of alkali wash water, full recycling of liquid, dual recycling of solid and liquid, no environmental pollution and energy saving.

Description

technical field [0001] The invention relates to an industrial filter and recovery system device, in particular to a filter and recovery system device for rolling alkali washing liquid. Background technique [0002] The cleaning methods used in the cleaning and degreasing process section of the steel strip in the production process are alkali spray washing, alkali scrubbing, high-pressure water spray washing, water scrubbing, water spray washing, hot air drying and other processes. The cleaning of the strip surface is an important link in the production of strip steel. The quality of its surface cleaning directly affects the quality of the strip steel. On the one hand, the cleaning is to clean off the oil on the surface of the steel plate, and on the other hand, it is to clean off the dust and rust on the surface of the steel plate. Surface treatment of strip steel. The impurities in the alkaline cleaning solution are mainly the grease brought in from the surface of the stee...

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Problems solved by technology

Because the magnetic particles are far or close to the magnetic center, the adsorption effect is not uniform, and most of the non-magnetic oil, sludge mixture, silicon dioxide and other impurities cannot be removed, and the filtering effect has a certain degree. Due to the limitations of the system, it has not fundamentally shortened the discharge time of the alkaline washing solution and reduced the supplementary amount of alkaline solution and pure water.

[0004] The removal effect of the magnetic filter on the grease is not obvious. At the same time, since the grease is easily adsorbed with the iron powder to form sludge, the magnetic rod is particularly susceptible to contamination by grease during the process of removing the iron powder, and frequent cleaning is required to ensure its normal operation. It requires high-temperature air-water mixing during backwashing, which consumes a lot of energy

At the same time, due to the inability to remove grease well, the alkali washing solution is frequently replaced and consumes a lot; the frequently discharged grease also needs to be treated up to the standard before it can enter the environment, resulting in increased production costs

[0005] The paper tape filter mainly removes iron powder, oil sludge (iron-oil mixture) and other particulate impurities in the purification and filtration of alkali washing liquid. Into the alkaline washing solution, the slick oil will accumulate more and more, which will affect the cleaning effect of the alkaline washing solution. At the same time, due to the large pores of the filter paper of the paper belt filter currently used, generally 20~40μm, the impurities smaller than the pores of the paper belt It is easy to pass through the paper tape and return to the alkaline solution, which will cause the alkaline solution to remain dirty for a long time

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