How to improve the efficiency of the filter press

2023-10-31 13:10:31
(1) Ensure a reasonable level of feed concentration. In theory, the higher the filter press concentration, the better. The higher the concentration, the shorter the filter press cycle, which maintains a larger throughput, a better filter cake moisture, and a lower solids content in the filtrate. However, China's coal preparation plant generally enters the filter press with the bottom of the simmering concentrator. The excessive underflow concentration brings hidden dangers to the normal and safe operation of the simmering concentrator. If the excessive underflow concentration is pursued, it may cause sputum concentration. The machine is crushed, which affects normal production. Therefore, the filter press feed concentration should be maintained at 400 ~ 600g / L, in this way, can not only ensure the required feed concentration of the filter press, but also ensure the normal operation of the 耙 thickener.
(2) Maintain a reasonable feed pressure. The feed pressure is the main driving force of the pressure filtration process. The higher the feed pressure, the faster the filter press speed. However, the excessive feed pressure is likely to cause wear and tear of the equipment. At the initial stage of the feed, the filter chamber has not been intercepted. Sufficient material, strictly speaking, the sealing property of the filter chamber is not ideal. Therefore, the low pressure and large flow rate should be maintained during the feeding stage and the initial stage of the filter press. The pressure is controlled at 0.11~0.12MPa. Otherwise, the filter press will run the material and give the follow-up. The pressure filtration, the cake and the unloading cake have adverse effects. The pressure in the pressure filtration stage is preferably controlled at 0.149 to 0.159 MPa, but not more than 0.18 MPa, so as to avoid damage to the filter press, the frame, etc. of the filter press and unnecessary wear on the feed pump. The pressure can be adjusted by the gate valve throttling, or the pump head (supply pressure) can be adjusted reasonably by the frequency conversion speed regulating device of the feed pump motor;
(3) Guarantee a reasonable feed granularity. Most of the coal slurry treatment systems in China's coal preparation plants use filter presses to recover coal slime to achieve closed water washing. However, some coal preparation plants use coal slime centrifuges (high-frequency sieves) or other equipment to cooperate with coal slime filter presses. Achieve slime recovery and closed water wash. For the former process, the particle size composition of the filter press slurry is essentially uncontrollable. However, the latter process design has certain flexibility, that is, when the coal washing system (or flotation system) runs rough, a part of the thickener bottom flow can be reasonably split into the slime centrifuge to recover the coarse material, and the centrifugal will be centrifuged. The centrifuge liquid is returned to the filter press to feed, which not only improves the particle size composition of the filter press, but also improves the working condition of the filter press.
The filter press is an ideal slime water treatment equipment. The main factors affecting the operation of the filter press are the feed pressure, concentration, particle size composition and operation level. In order to improve the working condition of the filter press and improve the working efficiency, it is necessary to combine the production actuality and production process of the coal preparation plant to reasonably control and effectively adjust the factors affecting the working condition of the filter press to ensure the efficiency of the filter press. run.

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