Magnetic separators/magnetic automatic filters are systems for separating ferromagnetic particles from liquid media, whereby these can be emulsions, oils or washing solutions. The primary areas of application are grinding, honing and lapping machines. It is often possible to integrate our magnetic separators directly into the machines. In decentralised media treatment, magnetic separators are frequently placed on a paper belt filter, collecting container or tank, where they are operated in full or side flow. Be it in the form of a small system with a few litres per minute or as a central system with several thousand litres per minute - we have the right magnetic separator for you. 

The magnetic separator/magnetic automatic filter consists of:

• Sturdy stainless steel housing (optionally with/without receiving water)
• Magnetic roller with high-quality permanent magnets (hard ferrite or neodymium)
• Wear-resistant scraper plate
• Drive station

The housing of the magnetic separator is made of V2A or higher quality material. The magnetic neutrality of this material is very important. The magnetic roller, which corresponds to the housing as an overall system, exhibits fluidic optimisation and therefore ensures an excellent balance between separation performance and flow volume. The scraper for discharging the separated particles is also made of V2A and its contour is designed for a long service life and optimum separation results. 

The contaminated medium is fed to the receiving water in as calm a state as possible (laminar) and distributed across the entire width of the system. The type of feed has a significant influence on the separation performance and on the flow rate to be achieved.
The separation of ferrous particles depends on many influencing factors:

• Viscosity of the medium
• Flow behaviour of the medium (laminar/turbulent)
• Flow speed of the medium
• Shape and size of the particles
• Application temperature

From the receiving water, the contaminated medium flows through the working gap of the magnetic separator. The ferromagnetic particles are very strongly attracted by the magnetic roller. Due to the “coating formation” on the magnetic roller, it is even possible to separate non-magnetically detectable particles to a certain extent. The scraper plate is usually mounted in a rising position, which allows the discharged liquid to run back into the system.
The separated particles are pushed over the magnetic roller onto the scraper plate. If the quantity is large enough, the separated material falls off at the end of the scraper plate. The material to be separated can be collected or transported onwards by means of devices provided by the customer (containers/transport systems). The scraper plate incline can be changed by means of structural measures depending on the installation.

• Separately driven pressure roller
  •  Ensures less liquid discharge and improves the separation result (mainly for oil applications and abrasive wool)
• Inlet box
  • Version according to customer requirements (fully assembled and sealed)
    
• Sludge chute
  
  • Version according to customer requirements
    
• Sludge tank, etc.
  
  • Version according to customer requirements
    

A fundamental distinction is made between two types of magnetic rollers:

• Hard ferrite magnetic rollers are sufficient for most applications, highly robust and durable.
• Neodymium magnetic rollers (rare earths) are much more efficient in terms of separation performance. The main applications involve media that have an increased viscosity and separation material with a primary particle size ≤ 70 μm. The remanence of the magnets used is around 12,000 Gauss.

If abrasive wool or tufts of chip material are produced by grinding or other factors, this must be taken into account when designing the magnetic automatic filter/magnetic separator. Chip tufts or abrasive wool exhibit a relatively low Fe content in relation to the total volume. For this reason, the use of a neodymium magnetic roller is highly recommended for this application. If you provide us with appropriate sample material, we shall be happy to review the separation options available.

Discharge of the medium
Cycling the magnetic roller is the most effective means of reducing medium discharge. We shall be happy to agree suitable intervals with you in relation to your application.

• Caking on the scraper plate

If the separated particles tend to cake or stick together with the medium and the temperature combination, the scraper plate can also be designed with a steep incline (30°).

Magnetic automatic filter 
with receiving water
Version with 30° sloping scraper plate and rubber pressure roller
Type 12.15/2-01 to 10

Central filter system made of steel
with neodymium magnetic roller

Central filter system made of steel
with neodymium magnetic roller

Central filter system made of steel with cover flap
with neodymium magnetic roller

Central filter system made of stainless steel
with neodymium magnetic roller