Working Principle and Application of Plate and Frame Filter-Henan Dazhang filter equipment Co.,Ltd.

Working Principle and Application of Plate and frame Filter

Working Principle and Application of Plate and Frame Filter
1. Working Principle
1. Basic Structure
The plate and frame filter press is composed of filter plates, filter frames, filter cloths, pressing devices, feeding pipelines and liquid discharge mechanisms. Filter cloth is covered on both sides of each filter plate; filter frames are hollow and used to form filter chambers when plates and frames are arranged alternately.
2. Filtration Process
Clamping Sealing: The hydraulic pressing device pushes all filter plates and frames tightly together, and the filter cloth between plates forms sealed independent filter chambers.
Feeding Filtration: The slurry to be separated is pumped into each filter chamber through the central feeding hole. Under pressure from the feed pump, liquid filtrate penetrates the filter cloth, while solid particles are intercepted on the inner surface of the filter cloth.
Filtrate Discharge: The clear filtrate flows through the drainage grooves on filter plates and discharges from the liquid outlet.
Cake Formation: As continuous feeding proceeds, intercepted solids accumulate to form filter cakes inside filter frames until each chamber is fully filled with filter cake.
Cake Discharging: Stop feeding, release the pressing force, pull filter plates apart one by one, and the dry filter cake falls off automatically by gravity for collection.
3. Optional Auxiliary Processes
Washing: Inject clean washing water into chambers to rinse soluble impurities inside filter cakes for higher solid purity.
Blow-drying: Feed compressed air to squeeze residual liquid out of filter cakes, reducing cake moisture content.
2. Core Characteristics
High solid-liquid separation efficiency, low moisture content of filter cake;
Adjustable filtration pressure, suitable for high-viscosity and fine particle slurries;
Simple structure, easy disassembly, cleaning and maintenance;
Batch intermittent operation, flexible handling of variable production volumes.
3. Main Applications
(1) Mineral & Metallurgy Industry
Tailings dewatering, concentrate filtration, sludge separation in gold, copper, iron ore, aluminum oxide production.
(2) Chemical Industry
Filtration of pigments, dyes, plastic additives, catalyst slurries, inorganic salt crystal separation, chemical waste residue treatment.
(3) Environmental Protection & Sewage Treatment
Municipal sewage sludge dewatering, industrial wastewater sludge treatment, electroplating sludge, printing and dyeing sludge, chemical hazardous waste sludge separation.
(4) Food & Beverage Industry
Separation of fruit pulp, sugarcane juice, wine residue, edible starch slurry, soybean protein waste residue filtration.
(5) Construction & Building Materials
Ceramic mud dewatering, bentonite slurry filtration, calcium carbonate, kaolin solid-liquid separation.
(6) Pharmaceutical Industry
Separation of herbal medicine extracts, pharmaceutical intermediate slurries, antibiotic fermentation residue filtration.
(7) Other Fields
Wool washing wastewater treatment, soil remediation slurry separation, ceramic filter matching auxiliary filtration.