Filtering elements for hydraulically squeezing and extruding out mud cake

Abstract

The invention relates to filtering elements. A set of filtering elements is clamped in a pressure bearing structure of a flexible pipe squeezing machine along the direction of squeezing force; the filtering elements are characterized in that at least one water-permeable plate is arranged in a filtering chamber; the front and rear surfaces of the water-permeable plate are water-permeable filtering surfaces; the water-permeable filtering surfaces of the water-permeable plate are vertical to the direction of squeezing force; the water-permeable plate is located in the filtering chamber at the upside of a lower flange; and each water-permeable plate comprises a plate type filtering medium, an upper locking plate pressure strip, an upper locking plate strip, a filtering cloth tightening strip, a filtering cloth tightening pressure strip and at least one filtrate cavity communication pipe mouth. The working principle of the filtering elements is as follows: the filtering chamber of a part of flexible filtering elements is filled with raw materials to be taken as pressurized filtering elements; the filled raw materials expand slowly by utilizing other filtering elements as pressure-applying filtering elements; the pressurized filtering elements filled with the raw materials are compressed by utilizing the expansion force, so that the raw materials are squeezed and dehydrated; the mud cake in the filtering chamber is extruded out by utilizing the expansion force; immediately, the filtering elements are converted into the pressure-applying filtering elements; and, by means of such a cycle, the dehydration process of the raw materials is completed.

Description

technical field [0001] The invention relates to a filter element for solid-liquid treatment of viscous and fine-grained substances, which is used for hydraulic pressing and extruding mud cake discharge, especially suitable for papermaking wastewater treatment, sludge treatment, river dredging mud treatment, wet smelting Dehydration in waste water treatment, coal washing waste water treatment and livestock and poultry breeding pollutant treatment. Background technique [0002] The filter element proposed by the present invention is the improvement of the filter element of the flexible pipe press that adopts hydraulic pressing and extruding mud cake that I propose or is used as a general filter element of this type of squeezing device. With a little improvement, it can replace the traditional filter element. The plate and frame filter element of the plate and frame press machine can also replace the diaphragm plate and frame filter element of the plate and frame diaphragm pres...

AI Technical Summary

Problems solved by technology

[0007] In the patent application No. 2010102458340 "Flexible Tube Press Using Hydraulic Squeeze and Extrude Mud Cake", the technical scheme of the filter element is proposed, and the raw material is transported to a filter element as a pressurized filter element by using a raw material pumping device, wet Mud is used as a raw material to bulge the filter chamber of the filter tube unit along the direction of the pressing force under high pressure, and the adjacent permeable plates have basically equal gaps due to the action of the elastic gasket. We hope that the wet mud will squeeze into all the openings along the direction of the pressing force However, due to the large gap between the two sides of the permeable plate and the filter tube unit, this gap becomes a wet mud raw material channel with low resistance, and it is difficult for the wet mud to overcome the large resistance and fill into the adjacent In the gap between the slits between the permeable plates, the wet mud will form a short circuit at the inlet and outlet of the filter chamber. If the wet mud cannot be evenly distributed on the filter area, and then use the filtration mechanism to complete dehydration, this will make the filter element The dehydration effect is greatly reduced, and it will be difficult to meet the requirements of the thickness and parallelism of the filter chamber at the initial stage of wet mud entering the filter chamber, which also greatly reduces the dehydration efficiency of the filter element.

[0008] In the flexible pipe press of the published patent application No. 2010102458340, there are the following problems: the structural design of the permeable plate is not optimized, and the manufacture and installation are relatively complicated

[0010] In the existing public information, we have not found any similar information about the use of hydraulic pressing and flexible tube presses for extruding mud cakes

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