Automatic Backwash Filter Candle Filter

Automatic Backwash Filter Candle Filter
Product Details

Candle filter(Model:INOCO-DS-A7)introduction 

The candle filter is, as all pressure filters, may be seen in process lines handling titanium dioxide, flue gas, brine clarification, red mud, china clay, fine chemicals and many other applications that require efficient low moisture cake filtration or high degree of polishing.Candle filters are also used for thickening to produce a concentrated flowable slurry by partial removal of the liquid phase as filtrate. This mode of operation is possible since candle filters may operate on very short cycle times taking advantage of the high filtration rates whilst the cakes are still thin. One of the features of candle filters when used for thickening is their clear filtrate since gravity thickeners, in analogy, produce overflows which always contain a certain amount of fine suspended solids. 

Working principle

During the filtration, which takes place in a pressure vessel, the liquid is pressed from the outside through the filter medium. Solid connect on its surface and form a uniform cake. The cake remains on the filter elements due to their concave-convex profile and a continually maintained pressure differential across them. When the pressure drop to the set valve, inlet and outlet valve turn off. Compressed air flow into the filter and dry the filter cake, in the backwashing processing, the particle will be removed, and the filter element could be regenerate.


Another feature of Candle Filters is the cylindrical shape of the elements that retain the formed cake. This shape, opposed to Plate, Leaf or Filterpresses, increases the filtration area as cakes grow thicker and compensate to some extent to the decrease in filtration rates.

Candle Filters are very well suited for handling flammable, toxic and corrosive materials since they are autoclaved and designed for hazardous environments when high pressure and safe operation are required. Likewise, they may be readily jacketed for applications whenever hot or cold temperatures are to be preserved. These features are not possible on Filterpresses which require the opening of plates to the atmosphere by one to allow cake discharge at the end of each cycle.

Candle Filters are available in all sizes and the larger types may have an area of 200 m2 and contain 250 or more filtering elements installed in a 2.5 to 3.0 meter diameter vessels. The operating pressure range is quite wide but most of the Candle Filters operate at a pressure of 6 bars. It can be used filter 1 micron for pre filter candle. 


■ Excellent cake discharge.

■ Adapts readily to slurry thickening.

■ Minimum floor space.

■ Mechanically simple since there are no complex sealing glands or bearings.

■ Wet and dry discharge

■ The filtered solids are dewatered and discharged by gas blow-back, filter cake can be used for reaction.

■ Continuous thickening

■ This filter type allows continuous filtration without interruption of flow; the solid are flushed back into the liquid and dischared in slurry form, this filtration process mainly applies for processes where contious flow is required.

■ Candle filter design, which is designed to comply with the high production standard of pharmaceutical and biotech industries. Surface finish and design of internals allow effective cleaning of all parts in contact with product. 

This filter system has been successfully applied in these fields.

■ Titanium dioxide■ Removal of the catalyst
■ The current board■ Phosphating
■ Viscose fiber■ Activated carbon
■ Nickel production■ Zeolite production
■ Fuel gas desulfurization■ Production of edible oil
■ Waste water treatment■ Chlor alkali production
■ Resin■ Polyol
■ Production of PVC 

■ Gas desulfurization

After Sales

Inoco provide high quality, specialized and in time service. We can provide all technical data the project required, drawing, product instruction, production progress and ITP.   


1. Are you a manufacturer, trading company or a third party?

A:We are a manufacturer, and we have builded up our company since 2007.

2. What is your minimum order quantity, can you send me samples?

A:Our minimum quantity is 1 set, as our product is machinery equipment, it’s difficult to send you samples, however, we can send you catalogue, warmly welcome you to come visit our company.

3. Which level of quality are your products?

A:We have got CE, ISO, SGS, TUV, Rosh, ASME certificate so far.

4. As the shipping period will take long time, how can you make sure the machine won’t be broken?

A:Our machine is film wrapped, to make sure the machine can be delivered to our customer smoothly, we will use the steel wire to fix the machine with the container.

5. After we placing an order, will you arrange the installation of the machine at present?

A:All the machines will be tested well before delivered, so almost of them can be used directly, also our machine are easy to be installed, if you customer needs our assistance, we will be pleased to arrange the installation, but all the cost will be be charged by you.

6. How can i get the after-service?

A: We will send you the spare parts by free if the problems caused by us. If it is the men-made problems, we also send the spare parts, however it is charged. Any problem, you can call us directly.