Candle Filter, Diatomite filter, Activated carbon Filter
The candle filter, also called the filter cake filter, is a combination of a plurality of porous filter elements in a closed container, and a filter cloth (or other filter medium) is placed on the outer surface of the filter element, and is arranged side by side in the container, which is shaped like a The root candle, so called the candle filter.The filter is suitable for the filtration of impurity content of 0.5% to 40%.

Operating principle

When the candle filter is starting to its filtering process, the slurry is fed into the filter by the pump. The liquid phase in the slurry passes through the filter medium and enters into the center of multi-hole filter element, and is discharged from the outlet of the clear liquid. Before the cake layer is formed, the relatively clean liquid is sent to the inlet of raw material slurry again to do a filtration process, until the filter cake layer is formed (or meet the requirements ), and then, the control system will give a signal to stopping the recycle filtration. The clean liquid will be sent to next process through the Three-way valve and execute the normal filtration process.
After a normal filtration period, the system automatically provides a signal to stopping feed and drain away the remaining liquid when the filter cake layer on outside surface of multi-hole filter element is reach to a certain thickness. And then, the control system provides the signal again to back flushing (compressed air, nitrogen or Saturated steam), the filter cake is stripping, the outlet of slag is open to discharge by the control system. Next filtration process will be executed again.

Product features

1. Fully closed operation, no environmental pollution; can realize automatic filtration in one time, filter cake can be washed and dried
2. Easy to operate, safe and reliable, automatic / manual
3. Filter element can be self-cleaning, off-line cake/dehydration
4. Residual liquid can be filtered online to achieve dry slag discharge
5. Filter aid can be used to improve filtration accuracy
6. Filter material: 304 316L pure titanium, plastic materials, etc.
7. Filter element form: metal powder sintering, metal sintered felt, metal multilayer sintered mesh, polymer filter cloth, filter membrane, etc.
8. The filter element is designed with a double porous structure (internal stainless steel or plastic frame, external filter cloth)

Main Advantage

For clarification of liquid, diatomaceous earth, activated carbon and other adsorption aids can be directly added to the filtered material to make the filtration rate faster and the filtrate more clear.

1) Fully sealed operation, suitable for general material filtration, as well as for flammable, explosive, toxic or highly toxic dangerous products and filtration of foods, biological products and pharmaceuticals that are not allowed to be contaminated.

2) In the later stage of filtration, if the bottom residual material cannot be discharged back to the material tank, the residual slurry at the bottom can be pumped out by the pump, then returned to the top cover of the top filter, and evenly sprayed through the nozzle onto the filter element, and input through the filter. The compressed gas filters out all of the remaining liquid.

3) Since the filter can be re-filtered to form a uniform filter cake layer, the filter cake can be easily washed by passing the washing liquid into the container. If the filter cake is washed by the top spray method, the washing liquid can be greatly saved.

4) If a dry filter cake is to be obtained, after filtration or after washing and filtering, air, nitrogen or steam is introduced into the container to allow them to pass through the filter cake layer until the filter cake reaches the desired dryness and then in the container. Relieve and backflush the filter cake from the bottom.

Application area

Titanium dioxide production
2. Polysilicon silicon powder recovery, waste acid (hydrofluoric acid and nitric acid) filtration
3. Filtration of various feedstocks, fuels and lubricant additives
4. Various fine chemical and pharmaceutical processes
5. Removal of activated carbon after decolorization and adsorption of toxic substances
6. Recovery of various precious metal catalysts
7. Separation of decolorizer and activated carbon from edible oil
8. Filtration of circulating water in the glass and ceramic industries
9. Chlor-alkali industry production
10. Copper foil production
11. Oilfield water injection
12. Epoxy resin production
13. Flue gas desulfurization liquid filtration
14. Glass candle engraving filter
15. Sugar production
16. Melamine production
17. PVC production
18. Viscose fiber production
19. Wastewater treatment
20. Zeolite production
21. Circuit board production
22. Glyphosate decolorization and decarburization
23. brine fine filtration

Technical Parameters

1. Flow: wide range of applications
2. Filtration accuracy: 0.2~100um
3. Working pressure: ≥0.3Mpa
4. Control method: automatic, manual