ANDRITZ Separation - ANDRITZ Group

- Model Series A - Solid Bowl Decanter Centrifuge



Continuous, flexible, reliable, safe - the solid bowl decanter is used for chemical and industrial separation applications. The solid bowl decanter is a basic, standard machine to which features can be added for special applications. The solid bowl is ideal for clarification of liquids, thickening of sludges, and separation of solids.

Process flexibility

  • Constant separation results, even at fluctuations in the volumetric flow, the process conditions, or the product characteristics

Process conditions

  • gas-tight, vapor-tight, or pressurized operation
  • low vibration levels
  • absolute pressures from 0 to 8 bar
  • -90° C to +200° C
  • CIP cleaning
  • flameproof or explosion-proof standards making the decanter ideal for applications with solvents and hazardous materials

Cemical resistance

Materials such as titanium, pure nickel, or Hastelloy provide the security essential in demanding process applications.

Low space requirement

  • compact design at high specific throughput
  • self-contained system, therefore no extra space required for peripheral equipment

Low operating costs

Operating consumables (e.g. filter cloths) are not required. No costly downtime for changing consumables.

Simple installation

  • integration of all necessary functions in one package (e.g. no need for peripheral equipment)
  • active support system (no foundations)


Clarification is the separation of solids from a liquid of lower density over a particle size range from 1 to 10,000 microns.

By increasing the centrifugal force, it is possible to also separate very small particles in the submicron range, even with very small differential density.


By controlled reduction of the residence time, classification according to particle size, down to the submicron range, can be achieved with sharp separation cuts.

Liquid/liquid separation

Liquid phases of differing densities can also be separated.


Fine solids separated from the liquid can be thickened in a hindered settling mode, utilizing the volume of the cylindrical section of the decanter to maximize compression.


Compactive dewatering provides a substantially higher degree of dewatering with compressible solids.


Efficient and cost-effective counter-current washing is made possible by separate removal of the wash liquor over several sections of the screen.


The solids dewater by a combination of drainage and compression. The degree of drainage/compression depends on the nature of the solids, the setting of the centrifuge, and the required degree of dewatering. The transport and discharge of pasty, sludge-like or shear-sensitive solids are facilitated by the appropriate combination of conveyor geometry, cone geometry, and control of the differential speed.

Mixing and re-suspension

Special solids discharge geometry (gutter) allows the dewatered solids to be mixed with liquid directly at the discharge, thus eliminating the need for an additional mixing vessel.

Major applications

  • Organic chemicals
  • Inorganic chemicals
  • Ores and minerals
  • Water and wastewater
  • Food and pharmaceuticals

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