Used Jingjin 250 square diaphragm filter press

structural composition

• Filter plateUsually made of high-strength, corrosion-resistant materials such as fiberglass, stainless steel, etc., they are the main components that make up the filter chamber.

• diaphragmGenerally made of materials such as rubber and polyurethane, it is installed on both sides of the filter plate to separate the filter medium and compressed air.

• hydraulic systemProvide pressure, control the opening and closing of the filter plate and the pressure level to ensure the smooth progress of the pressure filtration process.

• electric control systemControl the operation of the entire filter press, including start stop, lifting, and other functions, to achieve automated operation.

working principle

• Filtering stageThe suspension is transported to each filter chamber through the feed pump. Under pressure, the liquid passes through the filter cloth and is discharged along the channels on the filter plate. The solid particles gradually accumulate to form a filter cake.

• Crushing stageWhen the filtration reaches a certain level, stop feeding and inject high-pressure medium, such as compressed air or water, into the diaphragm plate. The expansion of the diaphragm compresses the filter cake, further reducing its moisture content.

• Unloading stageAfter the squeezing is completed, open the filter plate and the filter cake will fall off under the action of gravity or external force.

advantage

• Low moisture content of filter cakeIt has a secondary pressing function, which can reduce the moisture content of the filter cake to 15% -30%, effectively reducing the cost and difficulty of subsequent processing.

• Wide range of applicationsCan withstand high pressure, up to 4.5MPa, suitable for high concentration, high viscosity materials, as well as some high value-added materials that require deep dehydration.

• High degree of automationUsually equipped with an automated control system, it can accurately adjust the extrusion pressure and duration. Some models also have online moisture content detection, which is easy to operate and has low labor intensity.

• Strong processing abilityWhen dealing with high concentration suspensions, the drier filter cake results in an increase in the effective volume of the filter chamber, leading to a significant increase in processing capacity.

shortcoming

• High equipment costDue to the addition of components such as elastic diaphragms, the structure is relatively complex, and the manufacturing process requirements are high. The equipment cost is 30% -50% higher than that of box type filter presses.

• High energy consumptionAdditional power is required to drive the diaphragm system for secondary pressing, resulting in an overall energy consumption 20% -35% higher than that of a box filter press.

• Difficulty in maintenanceThe elastic diaphragm needs to be replaced every 800-1200 cycles on average, and the cost of spare parts accounts for about 40% of the equipment maintenance cost. Moreover, the structure is complex, and maintenance requires professional technical personnel.

• Fast loss of filter clothThe shear force generated by diaphragm compression will accelerate the wear of filter cloth, and the frequency of filter cloth replacement is relatively high.

Application field

• Food and pharmaceutical industryUsed for clarifying fruit juice, refining edible oil, filtering pharmaceutical extracts, etc., it has strong sealing and high filtration accuracy, which can avoid material contamination.

• Municipal and industrial sludge treatmentIt can dehydrate sludge to a moisture content of less than 60%, meeting the requirements for landfill, and is a commonly used dewatering equipment in sewage treatment plants.

• Separation of high value-added materialsFor example, dehydration of positive electrode materials for lithium batteries, refining of rare metals, etc., can ensure high-purity filter cake with residual impurities<0.1%.

• chemical industryCan be used for solid-liquid separation of various suspensions, such as dehydration of nano calcium carbonate, filtration and washing process of white carbon black, etc.