Coolants, the sludge from paint booths, the process water from industrial surface cleaning operations, or the process water from the treatment of glass and ceramic materials – whenever it comes to the cleaning/recycling of industrial liquids, the proven centrifugal filtering technology from Rösler offers numerous economic and technical benefits. Centrifugal filters – with manual or fully automatic sludge discharge -- remove solid materials from the process liquids down to very small particles through a purely physical/mechanical process. This technology eliminates the need for filters or chemical compounds which are costly to buy as well as being expensive to dispose of as waste material. Moreover, because the residual water content in the sludge generated by centrifuges is as low as 30%, sludge disposal costs can be significantly reduced.
Semi-automatic centrifuges for 2- and 3-phase separation
With a rotary drum speed of up to 3,000 RPM the semi-automatic centrifuges, built for easy „plug-and-play“ installation, offer an excellent separation performance. They are generating such a high centrifugal force that even very small and light particles are safely removed from the liquid. The sludge is collected in a polymer basket that can hold 22 kg (48 lbs) and is inserted into the rotary drum. For removal of the sludge this “basket” is simply taken out of the drum. Systems with a smaller capacity are currently under development.
Besides the separation of solids from the liquid phase the 3-phase centrifuges also allow the separation of liquids with different densities, for example the removal of unwanted oil from coolants. The process liquid contaminated with oil and solid particles is fed into the centrifuge at a constant flow rate. Because of the different densities of the three “phases” (solid/liquid1/liquid2) the solids and the two liquids are separated from each other. For removal from the rotary drum the two separated liquids are caught by two dedicated collecting tubes which transport them to their respective destinations.
Automatic sludge discharge for round-the-clock operation
Depending on the specified cleanliness requirements and the particle size and weight limits, the automatic centrifugal systems Z 1000 from Rösler offer a capacity of up to 100 liters/min (25 gal/min). They are the ideal solution for applications with very large process liquid volumes. The extremely high acceleration in the rotary drum of up to 2,000 g easily separates solid particles with a size of 2 µ or larger from the liquid. For larger volumes Z 1000 systems automatically discharge sludge from the rotary drum. The innovative discharge technology developed by Rösler offers significant technical advantages: While in conventional automatic centrifuges the peeling knife, powered by a geared motor, is continuously rotating with the rotary drum, the peeling knife in the Z 1000 centrifuges is stationary. At the beginning of the peeling cycle the knife is pushed pneumatically towards the wall of the slowly rotating drum and peels out the sludge without any load on the drum bearings. The peeling knife itself is made from highly wear resistant steel. Upon completion of the peeling cycle the inside of the drum is rinsed to flush out any residual sludge.
Solidly built and easy to maintain
The Rösler centrifuges distinguish themselves through their high performance and their rugged and maintenance-friendly design. For example, a key feature of the Rösler centrifuges is the indirect drive of the rotary drum by V-belt allowing the installation of heavy-duty drum bearings. For the cleaning of corrosive liquids throughout a wide pH range or process liquids with a high salt content, for example after TEM or ECM deburring applications, Rösler offers all centrifuges in a stainless steel version made from either 316 or 320 material.