1, suitable for the selection of plate frame filter filter media
The filter medium selected by the plate and frame press is generally the press cloth, but also the selection of cardboard or filter paper (cotton cake filter and plate and frame type oil filter) as the filter medium. The filter cloth suitable for filter press is divided by material, and the synthetic fiber is more. According to the structure, a kind of press cloth "calendered press cloth", which is suitable for press and filter, is mainly introduced in the following. When press cloth is calendered at high temperature, the holes in the yarns change from straight flared to inverted flared. When the unshaped filter cloth is filtered, the solid particles (fine particles) are easy to be trapped in the bell mouth to block the filtering channel, which cannot form good bridging pores and affect the filtering effect. Press cake and press cloth bond. Affects cake shedding and cloth washing. Press cloth after high temperature setting, smooth surface, stable aperture structure, not easy to deformation; The bell mouth forms a funnel, and the solid particles will not be stuck; It can form a good bridging filter layer. The filter precision is higher, the filter cake is easy to fall off, the press cloth is easy to clean, and the sealing between the filter plates is improved, the capillary leakage between the filter plates is reduced, more suitable for the operation of automatic filter press. Surface high temperature setting technology has good effect on treatment. Only the monofilament cloth can keep the treated structure stable without deformation, but the impact resistance and tensile strength of the monofilament cloth are far less than that of the compound silk cloth, which is very easy to be damaged. As a result, press cloth manufacturers produced a monofilament press cloth to overcome the weakness of monofilament press cloth. Use single wire filter cloth as the retaining layer and compound wire filter cloth as the supporting layer. The press cloth produced by this treatment technology can meet the requirements of the press press.
2. Selection principle and method of press cloth of plate and frame press
(1) the material of the press cloth should be selected according to the chemical and physical properties of the material. All press cloth suppliers provide as much technical information as possible.
(2) select the permeability of the press cloth according to the requirements of filtration accuracy (large interception particle size). The selection can be made by referring to the technical parameters such as large interception particle size provided by the filter cloth supplier. Although the press cloth plays a very important role in the initial filtration accuracy of the filter press, the higher the initial filtration accuracy is not the better, it is ok to consider that the filtration accuracy can reach a low requirement. Because the filter press in a period of time after the formation of the filter layer, the interception of the filter cloth is very small, really plays the role of fine filtration of the foot "filter layer", the formation of a good filter layer is the key to the use of the filter press technology.
(3) stripping performance of filter cake. When selecting the filter cloth, special attention should be paid to the stripping performance of the filter cake. Press cloth surface smooth flat, filter cake stripping quickly, short filtration operation time, high efficiency. It is not easy to strip the filter cake when it sticks to the press cloth, which will prolong the operation time of the filter press and reduce the working efficiency. If the press cloth needs to be replaced, the time will be longer. Now the general application of the wing press filter, press cloth replacement are more difficult. It is better to choose single silk press cloth than long compound silk and short fiber press cloth, and satin weave than plain weave press cloth.
(4) properties of press cloth. When choosing a press cloth, it is important to choose a good press cloth. The press cloth with good performance can be washed directly on the press press to reduce the number of cloth changes. After simple treatment (drying, washing, etc.), the filtration efficiency of the replacement press cloth is restored to more than 80%.
(5) material filtration experiment. The use of filter press is an experimental technology. It is very important to carry out filtration experiments on raw materials (without changing material properties and process conditions) after the preliminary selection of press cloth. Carry out sample experiment on material filtration. The filtration rate, interception effect, filter cake moisture content and cake unloading performance of the filter cloth were investigated.
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