Detailed explanation of the operation process of diaphragm filter press

Here is a detailed description of the operation process of the diaphragm filter press:

Preparation Before Operation

Inspection: Check the equipment for any damage or leakage. Examine the filter plates, diaphragms, and pipelines to ensure they are in good condition. Also, check the hydraulic system, electrical system, and control panel to make sure they are working properly.

Cleaning: Clean the filter chamber and related components to remove any dirt, debris, or remaining materials from previous operations. This helps to improve the filtration efficiency and prevent contamination of the filtrate.

Assembly: Assemble the filter plates in the correct order and tighten the filter press frame. Make sure the diaphragms are properly installed and the sealing surfaces are clean and free from damage to ensure a good seal.

Lubrication: Lubricate the moving parts of the equipment, such as the hydraulic cylinder rods and the transmission mechanisms, to reduce friction and ensure smooth operation.

Feeding System Preparation: Check the feeding pump and pipeline to ensure they are in good working condition. Prime the pump if necessary and adjust the feeding flow and pressure according to the process requirements.

Operation Process

Feeding: Start the feeding pump to send the slurry into the filter chamber. The slurry will be distributed evenly among the filter plates through the feeding channels. At the beginning of feeding, the pressure should be kept low to allow the filter cake to form gradually. As the filter cake builds up, the feeding pressure can be gradually increased to the normal operating pressure.

Filtration: As the slurry enters the filter chamber, the liquid passes through the filter cloth and is discharged as filtrate, while the solid particles are retained on the filter cloth to form a filter cake. The filtration process continues until the filter cake reaches a certain thickness or the filtration resistance increases to a certain level.

Diaphragm Compression: After the initial filtration stage, the diaphragm is activated. The hydraulic system applies pressure to the diaphragm, which then compresses the filter cake. This further reduces the moisture content of the filter cake and improves the filtration efficiency. The compression pressure and time should be adjusted according to the characteristics of the filter cake and the process requirements.

Draining: During and after the diaphragm compression process, the filtrate continues to be drained. Make sure the drainage channels are unobstructed to ensure the smooth discharge of the filtrate. Monitor the filtrate quality and flow rate to judge the progress of the filtration process.

Filter Cake Discharge: When the filtration and compression processes are completed, the filter press is opened. The filter plates are separated one by one, and the filter cake is discharged by gravity or by using a scraper or other discharge device. The discharged filter cake should be removed in a timely manner to prepare for the next cycle of operation.

Shut - down and Maintenance

Shut - down: After the filter cake is discharged, stop the feeding pump and close the feeding valve. Then, release the pressure in the hydraulic system and turn off the power to the equipment. Clean the external surface of the filter press and remove any remaining slurry or filtrate.

Maintenance: Regularly maintain the diaphragm filter press to ensure its long - term stable operation. This includes checking and replacing the filter cloth, inspecting the diaphragms and filter plates for damage, cleaning and maintaining the hydraulic system, and lubricating the moving parts. Also, perform a comprehensive inspection and maintenance of the equipment at regular intervals to identify and address any potential problems in a timely manner.

During the operation of the diaphragm filter press, operators should strictly follow the operating procedures and safety regulations to ensure the safe and efficient operation of the equipment.