RJ-RPW Swarf Recycling Line
The RJ-RPW has been designed to handle a large throughput as well as allow for quick clean down between materials. This unique design is extremely reliable an requires little downtime.
The Process flow of the RJ-RPW
1) Bulk Storage
After the particle size has been reduced by either a four shaft shredder or a hammer mill the particles are typically stored in a bulk storage vessel. In this instance, a vibratory infeed hopper is used. This machine is much more than simply a bunker for the material.
This machine is manufactured from 3mm stainless steel and incorporates a vibratory feed table with a width of approximately 1m. Feeding the material in this way guarantees a stable throughput for the entire line which is important in maintaining cleaning and drying quality. The rate at which the material is fed can be controlled via the PLC.
The RJ-RPW completes washing and rinsing processes within a series of wash screws mounted on an incline. The material is screwed within an enclosed U-troth with spray bars mounted down its length. The combination of the chemical action of the wash liquor and the physical impingement action of the spray heads removes contamination and surface carbon from the surface of the material. This same process is then used during the rinse stage. After the material is transferred to the rinse screw fresh water is used to rinse the surface of the material removing any chemical residues.
Both stages drain the effluent downwards, in the opposite direction to the flow of material. Once the liquid reaches the bottom of the screw it is drained into the recirculation system with both course and fine filtration to allow for reuse and thereby reducing the operating costs of the line.
To ensure the line is in use for many years to come many additional features has been included each stage is fitted with access panels for cleaning and maintenance as well as low water protection, auto water infill and temperature control.
Heating is typically required due to the nature of the contaminants present. To ensure that the RJ-RPW line can be installed in any facility options are included for heating by oil, gas, steam or electric.
Metal dissipates heat extremely quickly and therefore it is well known as a troublesome product to dry. This application also creates a separate problem for drying as many methods of heating will introduce surface carbon, rendering it useless as a feed stock for vacuum melting. To dry this material effectively Rotajet have specifically designed a new style of swarf dryer.
The system uses a 420mm diameter screw mounted on an incline and lagged with 25mm rockwool to increase its insulation factor. As the material travels the 5m length of the machine it is subjected to hot sir, blown in from the heat exchangers. Any water present, if not evaporated, drains down the machine to a water drain off valve that returns the water to the rinse tank. To allow for cleaning and maintenance removable plates have been included for access.
4) Ferrous Removal
A combination of magnets is used in this line to make sure that the ferrous material has been completely removed. Firstly an overband magnet is used to remove the bulk of the contamination. As the material travels along the conveying system small ferrous particles are trapped under the stream. To remove any remaining material a drum magnet is used to produce a decontaminated, dry stream for bagging off ready for transport to the vacuum furnace.
Rotajet has over 30 years industry experience and have become the go-to experts for decontamination and degreasing applications. We have worked with the biggest brands in aerospace, automotive and heavy industries to develop leading solutions to some of the worlds most pressing problems.