CORES - Vacuum drum filter for highly corrosive media

W. Knobloch*, ANDRITZ KMPT GmbH, Germany

Vacuum drum filters are state of the art in highly corrosive applications like producing Titaniumdioxyd (TiO2) in sulfuric acid (H2SO4) processes or in processes where slurries with a high content of hydrochlorid acid ( HCl ) is used. Conventionally these filters are made out of carbon steel covered with rubber lining to protect the structural design of the machine against corrosive attack. Disadvantage of this rubber lining is a partly embrittlement with tendency for cracks in relatively short time and therefore high maintenance costs with unscheduled production interruption.

In the past Filters complete made out form GRP were not long-term useable because of structural weaknesses of this material by chemical attacks along the glass-fibers due to capillary effects. Also Filter complete made out from Thermoplastics failed because of poor material properties. The new CORES-Vacuum drum filters are designed in a different way. Structural design is, dependent on size, made out of steel or completely out of GRP. In addition all parts in contact with the product are covered with a layer out of corrosion resistant, not reinforced plastic, which is commonly used in such industries, like PP (Polypropylene) or PVC. Furthermore some internal wetted parts can be completely designed out of resistant plastic and will be welded together with external surfaces out of plastic to have a closed surface for these corrosive applications.

The process functions of a vacuum drum filter remains still the same, but corrosion resistance of these new CORES-Filters are significantly increased compared with traditional carbon-steel rubber lined execution or conventional GRP-Filters without Thermoplastic-layer coverage.

Session: L12 - Cake Filtration - Enhancement of Continuous Vacuum Filters
Day: 24 October 2019
Time: 09:00 - 10:15 h

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