Hollow extracting micro-hole filtering element

Abstract

The present invention is improved filter plate for solid-liquid separating drier. The improved filter plate is hydrophilic microporous plastic plate with average pore size of 0.2-1.5 microns, and forms the sucking filter element walls. It is superior to available ceramic plate, and has pore opening rate of about 60 %, 20-30 % higher production capacity, high toughness, high impact resistance, and acid and base resistance.

Description

technical field [0001] The invention is an improvement to a filter plate used in a solid-liquid separation suction drying device, in particular to a hollow suction microporous filter element made of plastic. Background technique [0002] The hollow suction microporous filter element is a high-efficiency solid-liquid separation element that applies the capillary principle. Under the water-wet state, the capillary effect allows water to pass through, but gas and particles cannot pass through, especially for solid-liquid separation in concentrate dehydration and drying. There are many applications. Since the invention of the filter element, ceramic hollow filter plates with micropores (such as 0.5-3.0 μm) on the filter wall have been used. Although there have been many inventions and improvements during the period, none of them has been separated from the ceramic material. Microporous ceramics have actually become concentrates. The only filter element for hollow suction dehydr...

AI Technical Summary

Problems solved by technology

[0004] Ceramic material, especially the ceramic filter plate with many micropores, has low strength, and it is very easy to collide and break during manufacturing, transportation, and use. Especially once a piece is broken during use, the residue will fall into the filter tank. In the middle, it will cause chain damage to the rotating filter plate; secondly, the ceramic micropores are rough and inelastically deformed. After the fine particles in the filter medium are clogged, it is difficult to completely remove them during cleaning. The cleaning pressure will cause the filter plate to rupture. Because it is difficult to clean, it is usually equipped with an ultrasonic cleaning device, which increases the cost, increases energy consumption, and increases the failure rate; the production process of the ceramic filter plate is complex and the cycle is long. Moreover, it is easy to cause deformation of the hollow filter plate, and the production cost is relatively high; the above items all increase the cost of use

Furthermore, the effective opening porosity per unit area of ​​the microporous ceramic filter plate is relatively low (generally only about 40%), and the filtration efficiency is not high; A certain gap will increase the dehydration residual material on the filter plate surface, reduce the production capacity of the whole machine, and also reduce the production efficiency; in addition, the ceramic filter plate has poor alkali resistance and is not suitable for use in alkaline media, thus limiting the scope of use

[0005] Since the invention of the microporous ceramic filter plate, people have also known the existence of the above-mentioned shortcomings in long-term use. Due to the constraints of professional knowledge and technical concepts over time, as mentioned above, although people have made many improvements to it, they have not exceeded it. Using microporous ceramic chips, hollow suction filtration (such as slurry solid-liquid separation) can only use microporous ceramic plates. In fact, it has become a common practice in the industry, both at home and abroad.

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