Microporous film filter for acid liquor filtering

Abstract

The invention relates to a millipore membrane filter applied to acid liquid filtration, which belongs to the technical field of wastewater treatment. The filter comprises a tank body, a stainless steel tube sheet, a bulky polyfluortetraethylene membrane filter bag, filter bag support cage frameworks, an acid feeding flexible valve, a reflux flexible valve, a backsurge flexible valve, a mud discharge flexible, a cleaning agent liquid feeding valve, an air electromagnetic valve and an exhaust electromagnetic valve, wherein the bulky polyfluortetraethylene membrane bag is sleeved on the filter bag support cage framework, and all filter bag support cage frameworks are fixed on the stainless steel tube sheet through screws. The stainless steel tube sheet divides the tank body into two parts, wherein the upper part is a clean water area, and the lower part is a waste liquid area (a filter area). The filter has a simple structure, and takes a membrane made of a bulky polyfluortetraethylene material as a filter material, so as to achieve the real surface filter effect, and completely retain impurities in an acid liquid on the surface of the membrane. Because the selected membrane has excellent acid resistance, hydrophobias and smaller friction coefficient, the block phenomenon of the filter material can not occur.

Description

Microporous Membrane Filters for Acid Filtration technical field The invention relates to equipment in the technical field of wastewater treatment, in particular to a microporous membrane filter used in acid liquid filtration. Background technique In the pickling process of the pickling production line in the iron and steel plant, in addition to high-concentration acid liquid, various pickling tanks also produce a large amount of iron oxide scale, ferrous sulfate crystals (including sulfuric acid pickling tank), ferrous nitrate Various solid impurities such as crystals (including nitric acid pickling tank), these impurities accumulate in the pickling tank, occupying the effective space, consuming a large amount of effective acid solution, and at the same time, increasing the difficulty of maintenance and cleaning of the acid tank, and shortening the Time for normal maintenance of acid tank. In the prior art, the filters used in the pickling line are common orifice filter...

AI Technical Summary

Problems solved by technology

In the pickling process of the pickling production line in the iron and steel plant, in addition to high-concentration acid liquid, various pickling tanks also produce a large amount of iron oxide scale, ferrous sulfate crystals (including sulfuric acid pickling tank), ferrous nitrate Various solid impurities such as crystals (including nitric acid pickling tank), these impurities accumulate in the pickling tank, occupying the effective space, consuming a large amount of effective acid solution, and at the same time, increasing the difficulty of maintenance and cleaning of the acid tank, and shortening the Time for normal maintenance of acid tank

In the prior art, the filters used in the pickling line are ordinary orifice filters, etc., with poor filtering capacity and no self-cleaning function, and are basically not in use at present.

Therefore, looking for a good acid filter to completely solve the problems of too many impurities and too many crystals in the acid is an urgent desire of various iron and steel plants.

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