Industrial Candle Filter System

What exactly is a Candle Filter? A Candle Filter is a streamlined industrial tool predominantly utilized to filtrate liquids with minimal solid content. It excels in yielding high output, discharging dehydrated filter cakes, and managing various filtrates. This tool is especially effective for filtering mediums that are flammable, toxic, or corrosive.

Designed with rigorous production processes in mind, the Candle Filter can operate continuously, recycling and filtering without system interruption, thereby minimizing downtime and ensuring operational safety. As pressure filters that work in batch cycles, Candle Filters find applications in areas like Titanium Dioxide Disposal, High-Temperature Flue Gas Handling, Brine Clarifications, Fine Chemicals, and any process requiring efficient separation and removal of filter cakes.

Candle Filter Uses & Candle Filter Principle

When the slurry is pressed into the pressure vessel, the direction of the slurry is always from the bottom up. It is conducive to the solid particles settling on the surface of the filter candle in the uniform suspension to ensure the formation of a consistent filter cake.

Filter cakes form on the outer surface of each stainless steel candle filter element. According to the design requirements, the filter candles in each row are connected to the top in series connection and parallel connection. This design is determined according to the result of the process requirement.

The discharge pipe for the slurry is linked to the level set, and every set tube is attached to the primary branch line via the electric valve. The electronic valves control the filtration and reverse wash, and each valve optimizes the formation of the filter cake of the filter candles online by controlling the flow. All header slurries are transported to the main branch line by electric control to form a loop filtering process.

industrial candle filter
  1. Overview and vent nozzle
  2.  Saddle flange for heel filtration spray jet nozzle
  3.  Filtrate nozzles
  4. Register
  5. Filter element
  6. Pressure vessel shell
  7. Filter medium (cloth, felt, membrane etc.)
  8. Cloth clamp ring
  9. Product feed nozzle
  10. Heel volume nozzle
  11. Solid-residue discharge nozzle

The Composition of the Candle Filter Design

  • Vessel shell
  • The vessel shell with a conical bottom is used for filtering and polishing the filter cake.
  • A vessel with a concave bottom is used to thicken the slurry.
  • Candle filter element
  • A discharge mechanism of the filter cake
  • All of these components can be made from unique structural materials and meet the requirements of the process.

Selection of Candle Filter Elements

Each candle filter element is composed of a cylindrical porous support structure. The general filter medium is installed on the metal punching support structure and clamped into position. This rigid design allows for high-pressure filtration.

The replaceable filter medium can be any woven or sintered materials in line with the filter. There are various filter mediums, such as stainless steel porous sintered metal tubessintered metal composite woven mesh screens, synthetic filter cloth, etc. The medium can be chosen according to t the design and candle filter uses.

Candle filtration system
Filter cake falling off
Candle filter element support element 1

Pie removal mechanism

The filtrate is filtered to form a solid slurry or a dry cake. For the easily detached cakes, they can adopt rapid pulse back blowing of air or nitrogen (gas) to cause the filter medium to bend quickly away from the candle. To make the cake fall off t the conical bottom of the candle-type filter container from the candle medium.

However, for the refractory cakes, the vibration mechanism installed in the upper part of the container is needed to help release the surface cakes of the whole candle filter group. When this happens, it is the best way to combine the transparent filtrate with a high pulse to reverse flow to the special header to clean the candles. All these operations are formed through automation to ensure reliable product quality and repeatable batch filtering.

It is designed to run without active components, so the maintenance requirements and costs are shallow. The candle filter internals are made of a new synthetic material, contributing to reliable operation and long filter life.

filter candles online

Reference factors for choosing industrial candle filters

  • When space required is limited, and large filter areas are needed
  • There may be no vacuum when the filtrate evaporates.
  • When polishing applications require high-clarity filtrates
  • When poisonous and flammable cakes are at risk of environmental hazards, a particular safe emission mechanism can be added.
  • When the filter cake can be dried or drained as a thickened slurry

Candle Filter Design

Industrial candle filters are available in various sizes to remove solid particles larger than 0.5 microns. More significant types can have a filtering area of 60 square meters and contain 112 or more filter elements installed in containers with a diameter of 2.5 to 3.0 meters. Though the working pressure range is quite broad, most candle filters work at the pressure of 8 bar.

Candle Area (m²)                             0.34-60
Filtration Accuracy (um)                 0.5-200
Design Pressure (Mpa)                   0.6.  1.0.  1.6
Cake thickness                                up to 35mm
Set Temperature(℃)                       80℃~260℃ Mainly depends on the material
Product Material                             SUS304, SUS316L


  • Excellent cake discharge, clarification, and thickening suitable for slurry, minimum floor area
  • Simple mechanical structure without complex sealing glands or bearings.


  • Removal of filter elements requires a high clearance height
  • System working pressure is required to fluctuate within a small range, and pressure in the container is closely monitored to ensure the filter cake remains on the candle

Industrial Candle Filter application solution

Saifilter candle filter manufacturers can provide independent candle type filters or complete candle filters; all of our candle filters are custom-designed to meet each customer application's needs.
It is easy to transport and assemble for adopting modular design, transported. All the products are made in China with a competitive price, short delivery cycle, and service. With the excellent design and comprehensive technical support, it can be easily filtered from each aspect. I am glad to receive an inquiry about the industry candle filter; it is a candle filter supplier that can meet your application.
This technology has a reliable performance record across a wide range of applications. Saifilter candle filters are commonly used to:

  • Pharmaceutical Filters
  • Fine Chemistry Filters
  • Food Industry Filters requiring FDA approval
  • Fuel and Oil Additive Filters
  • Hazardous Materials Filters
  • Precious Metal and other Catalyst Recovery Filters
  • Solid content: up to 2%
candle filter uses
ndustrial candles filter ionline

We can choose the filtering system suitable to your practical needs according to your specific parameters If convenient, please send me more detailed information as follows:

1. The Name of the filter media?
2. Flow rate?
3. Filter rating?
4. Working pressure?
5. Working temperature?
6. Impurity content and nature(solid or soft)?
7. Installation space and connection size?
8. Housing material?
9. Do you need explosion protection?
10. Type of discharging valve? Electric valve? Or a pneumatic ball valve?

Then I will offer you our best price ASAP.

Yes, candle filters do work. A candle filter is a cylindrical filtration device used primarily in chemical industry applications to separate high-value catalyst solids from liquids. Their design and filtration mechanism allow for efficient filtration, typically using polyester microporous media to capture solid particles while allowing liquids to pass through. The efficiency of a candle filter depends on factors such as the particle size of the liquid being filtered, the design of the filter, and the filter media. In the industries where they are used, candle filters have proven reliable and efficient in achieving the required separations.

A candle filter is a tubular filtration device shaped like a candle and made of porous materials such as wire mesh, sintered metal, or polyester filter cloth. It is used in a variety of industries to trap impurities on its outer surface while allowing clear liquids to pass through, making it ideal for exemplary chemical fluid filtration processes.

Candle filters are usually used for solid-liquid separation in catalyst recovery. Their unique design and shape make them particularly suitable for chemical industry applications, such as high-precision and high-purity filtration requirements.

A candle filter in the chemical industry is a vertical cylindrical filter device used to separate solids from liquids. Its "candle" shaped filter element is made of porous materials such as ceramic or polyester filter cloth.

As the liquid slurry flows through the candle, the liquid penetrates the candle filter while the solids remain on the surface. This causes a solid filter cake layer on the candle element, increasing filtration efficiency.

The chemical industry favors candle filters for their high filtration accuracy, ease of cleaning, continuous operation capabilities, and scalability. They are used in petrochemicals and pharmaceuticals where clear, impurity-free filtrate is required.

The service life of a filter candle depends mainly on several factors, including its filter material, duration of operation, solids content, and the type of contaminants it filters out.

Typically, filter candle elements can last six months to a year or even longer. However, regular inspection and maintenance is required to ensure optimal filtration performance. If the solids content of the liquid to be filtered exceeds 5%, candle filters should not be used.


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