(1) Ensure a reasonable level of feed concentration. In theory, the higher the feed concentration of the filter press, the better. The higher the concentration, the shorter the filter press cycle, which can maintain a larger processing capacity and a more ideal filter cake moisture. As well as the lower solid content in the filtrate. However, in coal preparation plants in my country, the underflow of the rake thickener generally enters the filter press, and the high underflow concentration will bring danger to the normal and safe operation of the rake thickener. The concentration of the underflow may cause the rake concentrator to press the rake and affect the normal production. Therefore, the feed concentration of the filter press should be maintained at 400-600g\/L, which can not only ensure the feed concentration required by the filter press, but also can Ensure the normal operation of the rake thickener.
(2) Adhere to a reasonable feeding pressure. Feeding pressure is the primary driving force for the filtration process. The higher the feeding pressure, the faster the filtration speed. However, excessive feeding pressure will easily cause equipment wear; In the initial stage of feeding, there is not enough material to be retained in the filter chamber. Strictly speaking, the sealing of the filter chamber is not ideal. Therefore, in the feeding stage and the initial stage of filtration, low pressure and large flow should be maintained, and the pressure should be controlled at 0.11-0.12MPa, otherwise It will cause the filter press to run out of material, which will adversely affect the subsequent pressure filtration, cake formation and cake unloading. The pressure in the filter pressure stage is preferably controlled at 0.149-0.159MPa, but it should not be greater than 0.18MPa, so as to avoid excessive pressure Damage to the filter plate, frame, etc. of the filter press and unnecessary wear to the feed pump. The pressure can be adjusted by throttling through the gate valve on site, and the pump head (providing pressure) can be adjusted through the frequency conversion speed control equipment of the feed pump motor. reasonable adjustment;
(3) Ensure a reasonable feeding particle size. Most coal preparation plants in my country use a filter press to recover the slime and complete the closed circuit for washing, but some coal preparation plants also use a slime centrifuge (high-frequency screen) or other The equipment cooperates with the coal slime filter press to work together to complete the coal slime recovery and washing water closed circuit. For the former process, the particle size composition of the slurry fed into the filter press is basically uncontrollable. However, the latter process design has certain The flexibility of the coal washing system (or flotation system) is that when the coal washing system (or flotation system) runs coarse, part of the underflow of the thickener can be reasonably divided into the slime centrifuge to recover the coarse material, and the centrifuge centrifuge can be returned to the filter press for feeding. This can not only improve the particle size composition of the feed to the filter press, but also improve the working condition of the filter press.
The filter press is an ideal coal slurry water treatment equipment. The main factors affecting the operation of the filter press are the feed pressure, concentration, particle size composition and operating water. In order to improve the working condition of the filter press and improve the working efficiency, it is necessary to Combined with the production practice and production process of the coal preparation plant, reasonable control and effective adjustment of various factors affecting the working condition of the filter press are carried out to ensure the efficient operation of the filter press.
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