Filter expressions

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A filtration principle
(A) The basic concept of filtration is the use of some kind of porous media, the suspension was subjected to the operation of separation. Work, the e xternal force, the suspension liquid flowing out through the pores of the medium, and solid particles are trapped, and thereby achieve separation. Referred to as the filtered pulp suspension will generally be filtered; used in porous media is referred to as the filter medium; through pore liquid medium called filtrate; trapped solids known as filter cake or residue.
The filtering operation is driven by the filter medium on the downstream sides of the pressure difference, generating the pressure difference between the methods are the following:
(1) use of to filter slurry own indenter;
â'¡ pressure in the surface of the filter pulp;
â'¢ In the downstream side of the filter medium Balloting vacuum;
â'£ using inertial centrifugal force.
Filtering operation can be divided into two categories according to the role of the principle:
1 Sieve analysis hole mesh of the filter of the filter medium is less than the diameter of the solid particles, r ely on the role of the sieve analysis of the solid particles from the suspension is removed.air filter material
Sieve analysis filter outflow tiny particles in the beginning of filtration, the filtrate is turbid. With the formation of the cake layer and thicker, and the filtrate gradually become clear. Sieve by gradually blocking the filtration rate is decreasing. Filtration process when a cake layer is formed, the role of the sieve analysis generated by the cake layer, the filter medium lost the sieve analysis, only play the role of supporting the cake layer, said cake layer filtering.
(2) adsorption filter (deep bed filtration): the mesh number of the mesh filter medium is greater than the diameter of the solid particles, the solid particles into the filter media pore after the surface of the medium by adsorption.
Actual production, sieve analysis and adsorption, adsorption filter media i nterception larger particles; the Sieve Analysis filtration medium cake layer adsorption of smaller particles.
Second, the filter medium and the filter aid
A major role of the filter medium of the filter medium supporting cake was required to have a porous structure, a sufficient mechanical strength, and as small as possible a flow resistance, corrosion resistance.
The commonly used filter medium has the following types:
â'  fabric medium, such as industrial filter cloth, wire mesh;
(2) a particulate media, such as perlite powder, cellulose, diatomaceous earth, etc.;
(3) solid cardboard, such as the decolorization wood cardboard synthetic fiber board;
â'£ filtration membrane, composed of cellulose and other polymers. The granular media as a filter aid pre-coated fabric surface of the medium used for coarse filtration; solid cardboard media used for semi-fine filter and fine filter; filtration membrane media for fine filtration and ultra- fine filter.
, Filter aid, some of the hard particulate matter precoated on the surface of the filter media or added to filter the slurry to form a relatively hard, and loose the filter cake, the filtrate can be passed, such particulate matter is called a filter aid . Filter aid requirements: the filter aid is a hard, loose structure of a powdery or fibrous solid, shaped filter aid can be well suspended in the feed solution, the appropriate particle size, free from soluble to the substance of the filtrate.
The commonly used filter aid such as diatomaceous earth, cellulose.
Objective: use of a filter aid to prevent pore blockage of the filter medium, or reduce the filtration resistance of the filter cake.
Filter aids and methods precoated Act and premixed law.
The filtered wine production operation using a filter aid is diatomaceous earth and cellulose. Diatomite the diatom fossils of aquatic plants, a plot by the paleontological remains of diatoms Sh en Yan. Its main component of SiO2 (85-90%), was an off-white powder, the particle size is generally 30-40μm, a minimum of 2μm, and a maximum of 300-400μm, the specific gravity of 0.31-0.7.
The main features:
â'  mainly composed of SiO2, good chemical stability. Do not dissolve any strong acid, except HF can be dissolved in a caustic alkali. Filtered slurry of different concentrations and different temperatures may be applicable;
(2) when used as a filter aid, to obtain a higher clarity of the filtration rate and the ideal. Diatomaceous earth having a myriad of small holes and duplicate wells, with a porosity of 80-90%, which provides a larger space for entrapping solid particles. Coupled skeleton hard, the cake formed basically has the characteristics of an incompressible porous state even in the case of a pressure change remains substantially filtration resistance, high filtration speed and the ideal degree of clarification can be obtained;Waterproofing membranes