Rotary Drum Filters

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ROTARY DRUM VACUUM FILTERS

Chemical Plant & Engineering (CPE) manufactures rotary drum  filters in a variety of configurations depending on the process application. CPE has manufactured drum filters for a range of industry sectors including mineral processing, chemical, pharmaceutical, food and beverage.

BASIC DRUM FILTER OPERATION

These vacuum filters consist essentially of a cloth covered drum rotating in a tank filled with the slurry to be filtered. The surface of the drum is divided into shallow compartments which are connected by pipelines to an automatic valve so that vacuum can be applied to each. As the drum rotates, each compartment goes through the same cycle of operation; filtering, de-watering and discharging the cake, reconditioning or cloth cleaning.

Vacuum is applied to submerged segments. This causes the mother liquor to flow through the filter cloth, internal piping and valve, while solids are stopped on the outside of the cloth to form the cake.

As sections emerge from the tank, the vacuum de-waters the cake as the drum carries it around to the point of discharge.

When all mother liquor has been removed, the vacuum is automatically cut off and the cake is discharged from the drum.

ROTARY DRUM FILTER CAKE DISCHARGE SYSTEMS

The drum filters are available in five different cake discharge systems:

  • Blow back scraper
  • Roller
  • String
  • Belt
  • Knife advance – pre coat

The drum filters pre coat system may enhance filtrate clarity or assist with cake build up.

Filtration areas range from 1.0m2 to 240m2.

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