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Candle Filter
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A candle filter, also known as a tubular filter, is a type of pressure filter used for the separation of solids from liquids, particularly in processes where high filtration efficiency is required. It is widely used in industries such as chemical processing, pharmaceuticals, food and beverage, and wastewater treatment.

Working Principle

  • Introduction of Slurry: The slurry or suspension containing solids and liquids is introduced into the filter housing under pressure.
  • Filtration: The slurry flows into the candle filter elements, which are typically cylindrical or tubular in shape. The filter elements are made of porous materials, such as sintered metal, ceramic, or synthetic fibers, which allow the liquid to pass through while retaining the solid particles on the surface or within the pores.
  • Formation of Filter Cake: As the filtration process continues, a layer of solid particles, known as the filter cake, forms on the outer surface of the candle elements. The thickness of the filter cake increases over time, enhancing the filtration efficiency by capturing finer particles.
  • Discharge of Filtrate: The filtered liquid, now free of solids, passes through the porous candle elements and is collected in the filtrate outlet. The clean filtrate is then discharged or sent for further processing.
  • Cake Discharge: Once the filter cake reaches the desired thickness or the filtration cycle is complete, the filtration process is stopped. The filter cake is typically discharged by introducing gas or air into the filter housing, which helps to loosen and release the cake from the candle elements. The cake can then be removed manually or automatically, depending on the system design.After the filter cake is discharged, the candle elements are cleaned, either by backwashing, chemical cleaning, or other cleaning methods, to restore their filtration capacity for the next cycle.

Features of Candle Filters

  • High Filtration Efficiency: Candle filters are capable of achieving very high filtration efficiencies, making them suitable for applications requiring the removal of fine particles or for producing high-purity products.
  • Pressure Filtration: Candle filters operate under pressure, which allows for efficient filtration even with viscous liquids or slurries with high solid content.
  • Continuous or Batch Operation: Depending on the design, candle filters can be used in both continuous and batch filtration processes.
  • Automatic Cake Discharge: Many candle filters are designed for automatic cake discharge, reducing manual intervention and improving process efficiency.
  • Scalability: Candle filters are available in various sizes and configurations, making them scalable for different industrial applications, from small-scale laboratory use to large-scale industrial processes.

Applications of Candle Filters

  • Chemical Processing: Used for the filtration of acids, alkalis, and other chemicals where high purity and efficient solid-liquid separation are required.
  • Pharmaceuticals: Ensuring sterile filtration of liquid pharmaceuticals and biotechnology products.
  • Food and Beverage: Clarification of liquids such as wine, beer, edible oils, and juices.
  • Water Treatment: Filtration of industrial wastewater, drinking water, and other water treatment applications