FRIESS industrial magnetic filters and magnetic separators remove iron chips, metal fines and ferromagnetic particles from coolants, cutting fluids, grinding fluids, wash liquids and industrial circulating water. They provide fine filtration without disposable filter elements and with low maintenance costs.
High-performance neodymium magnets generate a powerful field that attracts particles made of iron, steel, some stainless steels, hard metals and corundum. Special flow guidance distributes the cleaned liquid evenly around a series of magnetic rods, allowing even extremely fine particles below 1 µm to be separated magnetically.
FRIESS magnetic filters require no filter media and no operating energy. Pressure loss is minimal, and the liquid can continue to flow even when the magnetic rods are fully loaded. Apart from occasional cleaning of the rods, virtually no maintenance is required.
Advantages at a Glance:
The fully automatic magnetic filter. Cleaning at the push of a button.
Removes iron, steel and stainless steel particles from all types of process fluids.
Filters particles from cooling lubricant, cutting oils and grinding oils.
Magnetic filters use a magnetic field to capture magnetizable particles from process fluids such as cooling water, emulsions, grinding oil and wash liquids. These particles include iron, steel and ferromagnetic grades of stainless steel or hard metal. Actual separation performance depends on material magnetism, particle size, flow rate and fluid viscosity.
Permanent magnets may use AlNiCo, ceramic or rare-earth materials. Neodymium magnets provide high magnetic flux density and strong holding force, but require coatings or stainless-steel sleeves for corrosion protection. Standard neodymium magnets withstand up to about 80 °C; for long-term stability, continuous operating temperature should generally remain around 60 °C or lower.
Magnetic drums and magnetic filters both use magnetic fields to separate magnetizable particles, but their design and operation differ. Process fluid flows across a rotating magnetic drum, particles adhere to the surface and are carried to a scraper for continuous removal. The cleaned drum re-enters the liquid flow. Typical surface field strength is about 2,500–3,500 gauss.
Magnetic filters contain no moving parts. Fluid enters the housing, flows across high-strength magnetic rods and returns to the system through the outlet. Magnetizable particles remain on the rods and are removed manually or automatically after a defined operating period. Typical field strength usually exceeds 10,000 gauss.
For nearly 50 years, FRIESS has developed solutions for cleaning process fluids. Magnetic filtration systems extend the service life of oils and process fluids and reduce wear on machines, tools and precision components, improving operating cost, resource efficiency and environmental performance.
Before selection, confirm the fluid properties and viscosity, design flow rate, operating temperature, system pressure, and inlet/outlet sizes and connection types.
Correctly matching field strength, flow-channel dimensions and cleaning method extends fluid life and reduces particle wear, equipment failure and maintenance downtime.
Magnetic filters can be installed in full-flow systems or operated in a bypass. In bypass operation, flow and differential pressure can be matched more precisely to the filter, usually delivering more stable fine filtration. In a full-flow line, the filter mainly protects pumps and critical components; system flow, pressure loss and cleaning intervals must be checked carefully.
Routine maintenance mainly consists of removing collected particles. Manual models are simple and require little beyond scheduled cleaning; semi-automatic and fully automatic systems only need periodic checks of scrapers, valves, seals and other wear parts.
A small amount of waste oil can contaminate a large volume of water. Continuously removing wear particles and extending oil life significantly reduces oil changes and waste-oil disposal; under suitable conditions, oil replacement can be reduced by up to about 90%. Magnetic filtration therefore lowers both resource consumption and environmental impact.
Magnetic filters suit any process that generates magnetizable particles. Typical applications include turning, milling, grinding, honing, lapping/polishing and EDM of steel and some stainless steels.
Cleaning, surface treatment, electroplating and pretreatment processes can also introduce ferromagnetic particles; timely separation reduces secondary contamination.
We can also recommend a suitable system for your operating conditions.
If the collected material consists of a single magnetizable metal and the residual liquid content is controlled, it may be reused internally or sent to an authorized recycler. Classification, recycling value and disposal routes should be confirmed with local recycling or waste-management providers.
It depends on particle load and required filtration accuracy. A magnetic drum is usually better for high loads of relatively coarse particles and can continuously remove particles of about 20 µm and larger. A high-strength magnetic filter is preferred for finer particles or ultrafine filtration. Many systems combine a magnetic drum for prefiltration with a magnetic filter for fine filtration.
Typical processes include grinding, honing, lapping/polishing, EDM, milling, steel and cast-iron machining, and industrial washing.
Suitable for high particle loads and continuous solids discharge, including coarse-particle removal, prefiltration and general machining-fluid cleaning.
FRIESS magnetic filters generally use high-performance permanent neodymium magnets. Their high flux density creates strong attraction for fine magnetizable particles; final selection also depends on operating temperature, corrosion environment and installation design.
Neodymium magnets are permanent magnets and require no power to maintain their field. If protected from overheating, corrosion, heavy impact and mechanical damage, their magnetic performance remains stable for many years. Observe the permitted operating temperature and keep coatings or stainless-steel sleeves intact.
Magnetite filters mainly serve heating-water systems and target magnetite formed by pipe corrosion. Industrial magnetic filters handle a broader range of circulating fluids and magnetizable metal particles from machining, washing and cooling systems, including larger flows and equipment sizes.
In addition to reducing costs, FRIESS oil skimmers, electrostatic oil cleaners, magnetic filters, coolant purification systems, oil-water separators and vacuum oil purifiers offer many other advantages.
We would be pleased to explain them.
