OSENC Magnetic Separation
Select a drawer magnet when a gravity-fed powder or granule line needs an enclosed housing with removable magnetic tube rows. Define the inlet, outlet, internal flow area, material behavior, tube layout, seals, extraction clearance and cleaning procedure before choosing dimensions.
Confirm the Process Boundary
Identify the equipment above and below the drawer magnet, the load it must support and whether flow is gravity-fed, vacuum-assisted or pressurized. A basic gravity housing should not be assumed suitable for pneumatic conveying or pressure without a specific mechanical design and rating.
Inlet, Outlet and Housing Interface
- Opening size and shape
- Flange, bolt pattern or clamp connection
- Available face-to-face height
- Housing material and wall thickness
- Dust sealing and required gasket
- Support, load and vibration
- Access-door and drawer orientation
Flow Area and Bridging Risk
Tube rows, supports and internal transitions reduce open area. Fine dry powder may flow well, while damp, fibrous, cohesive or large material can bridge. Provide normal and peak capacity, particle-size range, bulk density, moisture and evidence of existing flow problems.
One or More Magnetic Rows?
Multiple staggered rows can improve presentation but increase restriction and cleaning. The correct layout depends on target size, flowability, available height and acceptable pressure loss. Do not select rows from a generic “higher efficiency” statement.
Cleaning and Side Clearance
The operator must be able to isolate upstream feed, release any stored product, withdraw the drawer fully and remove captured iron without contaminating the clean side. Record the required extraction distance and nearby walls, platforms or cables. Consider drawer weight and safe handling.
Contact Materials and Seals
Specify all product-contact materials, not only the tubes. Include housing, drawer frame, fasteners, seals and any sleeves. Review corrosion, temperature, cleaning chemicals and food-contact requirements. Define leak and finish acceptance where applicable.
Magnetic Acceptance
State tube test locations, instrument, surface or sleeved condition and acceptance limits. A housing should also be checked for dimensions, drawer operation, sealing, weld condition, identification and safe reassembly. If process performance is critical, add representative material trials.
Choose Another Structure When
- An open hopper accepts a simple removable grate.
- Cleaning is so frequent that an easy-clean release system is justified.
- Material is sticky or bridges across the tube rows.
- The line pressure or sanitation regime requires a specially engineered housing.
- The target needs continuous drum separation rather than periodic cleaning.
Review drawer magnets Compare with an open grate Request a housing review
Minimum RFQ Data for a Drawer Magnet
| Decision rule | Choose housing, row arrangement and cleaning design where an enclosed chute interface and repeatable multi-row contact zone are required. |
|---|---|
| Inputs to confirm | Material condition, target iron size and loading, inlet and outlet, bulk density, moisture, peak rate, product head, temperature and seal requirement. |
| Risk or limitation | A drawer can restrict flow or leak when row spacing, housing orientation, seals and withdrawal clearance are treated as secondary details. |
| Buyer action | Provide flange and installation drawings and define cleaning stoppage, collection method and acceptance tests in the RFQ. |
Engineering Conditions Behind the Recommendation
- A high surface reading does not by itself predict capture in flowing product.
- Field gradient, shell or sleeve thickness, spacing, distance from each particle to a pole, particle size and magnetic response, flow speed, product depth, bridging and contamination buildup all change the result.
- Mechanical passage capacity is not the same as effective separation capacity.
- Quote or test conditions must identify material, size distribution, moisture, bulk density, normal and peak rate, feed distribution, speed, layer or flow geometry, contamination loading and cleaning interval.
What We Need to Configure This Project
Input set for How to Select a Drawer Magnet
- How we use your data: We compare your material, contamination risk, production target and line interface before we configure a proposal or rule out an unsuitable option.
- Material: name and composition; dry or wet; powder, granule, lump, fibre or slurry; minimum, maximum and typical particle distribution; moisture, stickiness, tendency to cake or bridge, abrasiveness, corrosiveness, bulk density, normal temperature and maximum temperature.
- Production and target: normal and peak throughput, continuous or batch feed, feed uniformity, contaminant or recovery target, magnetic response if known, typical and maximum target size, initial concentration, acceptable residual and whether product loss is permitted.
- Installation: hopper, chute or pipeline location, opening or flange dimensions and standard, flow direction, product head, extraction and cleaning space, upstream and downstream connections; cleaning method, permitted shutdown, contact-material, wear and corrosion requirements; indoor, outdoor, washdown, high-humidity, dusty or hazardous-area conditions.
- Supporting project files: power and control data for any actuator or automated cleaning option, plus available air supply and pressure where applicable; destination country; current drawings, site photographs, running video and a representative material/contaminant sample when testing is needed.
- What you receive next: We use the confirmed inputs to prepare a project-specific drawing and inspection plan. We do not treat performance as confirmed until the agreed design and any required representative test or site acceptance establish the result.
Project Support
Need help selecting the right magnetic solution?
Send us your material, flow condition, target metal, capacity, installation space and any drawings or site photos. We will review the application and recommend the next practical step.
Frequently Asked Questions
Why is “Confirm the Process Boundary” important for this decision?
Identify the equipment above and below the drawer magnet, the load it must support and whether flow is gravity-fed, vacuum-assisted or pressurized.
Why is “Flow Area and Bridging Risk” important for this decision?
Tube rows, supports and internal transitions reduce open area. Fine dry powder may flow well, while damp, fibrous, cohesive or large material can bridge.
Why is “One or More Magnetic Rows” important for this decision?
Multiple staggered rows can improve presentation but increase restriction and cleaning. The correct layout depends on target size, flowability, available height and acceptable pressure loss.
Ben — OSENC
Ben has more than 20 years of experience in the magnetic separation equipment industry and has worked with OSENC since 2019. He focuses on magnetic separators, tramp iron removal systems, metal recovery equipment, and custom magnetic separation solutions.
He helps customers clarify material type, particle size, moisture level, capacity, feeding method, target metal, and installation conditions, reducing wrong model selection, failed separation results, and unnecessary sample testing.