OSENC Magnetic Separation
Magnetic Separation for Salt Crystals, Granules and Powder
Ferrous Control with Chloride-Aware Construction
Dry salt can be passed across magnetic tubes, grates, or enclosed drawer assemblies to capture exposed responsive iron, but chloride corrosion and moisture must be treated as core design inputs. Select the process position and cleaning method first, then verify the actual contact material, finish, welds, seals, and magnetic test—do not assume 304 stainless or a maximum-Gauss label is adequate.
What the Magnetic Stage Can Do
It may capture ferrous wear particles, fastener fragments, wire, or other responsive contamination introduced during harvesting, transport, drying, crushing, screening, conveying, or packing. It cannot reliably remove nonmagnetic stone, plastic, aluminum, copper, or all stainless contamination, and it does not correct the source of repeated machine wear.
Possible Process Positions
- After receiving or crushing, to intercept introduced or liberated iron
- Before a mill, screen, or sensitive process machine, for equipment protection
- After conveyors, screws, or other wear-producing stages
- Before final packing, as a documented magnetic control point
Choose the Structure by Flow
| Structure | Use case | Main boundary |
|---|---|---|
| Magnetic tube | OEM or replacement element | Mounting, effective length, and full-stream coverage |
| Magnetic grate | Gravity-fed salt across multiple tubes | Spacing, bridging, cleaning, and withdrawal |
| Easy-clean grate | Frequent cleaning | Sleeve construction, pull-out space, and field at working surface |
| Drawer magnet | Enclosed inlet/outlet and multiple rows | Seals, housing, pressure, access, and corrosion |
Why Chloride and Moisture Matter
Salt deposits, humidity, brine, washdown, and shutdown conditions can promote pitting and crevice corrosion. Stainless grade selection must be based on the actual chloride exposure, temperature, finish, weld condition, cleaning chemistry, and expected service life. 316 or 316L may offer advantages in some conditions but is not universally immune. Request material evidence for the supplied parts.
Selection Checklist
- Salt type, purity stage, particle size, bulk density, and temperature
- Moisture, humidity, brine exposure, and washdown method
- Normal and peak flow with chute or pipe geometry
- Target iron type, size, frequency, and source
- Required contact material, finish, seals, and certificates
- Cleaning frequency, available pull-out space, and operator procedure
- Acceptance test and downstream quality measurement
Avoid Flow Restriction
Fine or damp salt may cake on tubes and bridge across a grate. A tighter array is not automatically better if it blocks the stream. Evaluate tube center distance, rows, chute angle, product buildup, peak surge, and whether the magnet can be removed and cleaned without contaminating adjacent areas.
Inspection and Validation
Define surface-field or pull-related measurements by position, instrument, orientation, temperature, and tolerance. Verify dimensions, material documents, finish, welds, seals, and cleanability. Where possible, test representative salt at normal and worst expected moisture and feed conditions, then inspect for buildup and corrosion over an agreed period.
Request Salt-Process Review
Send salt composition and grade, process stage, moisture and washdown information, flow, particle size, opening, contact-material requirement, contamination evidence, cleaning method, corrosion history, and document requirements.
Salt Condition and Corrosion Inputs for Equipment Selection
Use these inputs to decide whether the proposed separator and process position fit the real operating duty.
| Equipment direction | A grate or drawer magnet can remove ferrous contamination from dry free-flowing salt, but chloride exposure, moisture and cleaning chemistry must be reviewed for the complete contact assembly. |
|---|---|
| Material condition | Define crystal or powder size distribution, bulk density, moisture, chloride concentration, caking, flowability, abrasion and process and wash temperatures. |
| Target iron or magnetic fraction | Identify rust, wire, screen fragments and equipment wear; give expected particle size and the acceptable residual or downstream inspection requirement. |
| Throughput and presentation | Provide normal and peak kg/h, batch size, chute dimensions, product head and whether humidity or storage changes flow during production. |
| Installation and access | Confirm contact material, weld and finish, seals, washdown method, drainage, withdrawal space and avoidance of crevices where wet salt can remain. |
| Test or acceptance | Use actual salt and cleaning conditions for corrosion and flow review. Magnetic capture testing alone does not validate long-term contact-material suitability. |
Combustible Dust and Hazardous-Area Boundary
- For the named dry material, the plant owner must identify any combustible dust, vapour or gas and provide the site hazardous-area classification.
- No-coil permanent equipment is not automatically suitable: assess impact, friction, static, hot surfaces, bearings, drives, sensors and controls in the complete configuration.
- Confirm zone or division, substance and ignition data, dust layers, temperatures, earthing and bonding, cable entries, ingress protection, cleaning and destination-country rules.
- Do not claim explosion-proof or ATEX suitability until configuration-specific marking, declaration, instructions and evidence are verified.
Engineering Conditions Behind the Recommendation
- Do not select from a surface Gauss value alone.
- Review field strength and gradient at the rated working distance, including the conveyor belt, burden depth and any protective plate.
- Belt speed, feed uniformity, target size, shape and magnetic response determine how much time and force are available for capture.
- 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 Magnetic Separation for Salt Crystals, Granules and Powder
- 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: belt width and speed, normal and maximum burden depth, magnet position and rated working distance, available suspension and maintenance space, support and lifting arrangement; cleaning method, permitted shutdown, contact-material, wear and corrosion requirements; indoor, outdoor, washdown, high-humidity, dusty or hazardous-area conditions.
- Supporting project files: drive voltage, frequency and phase where a self-cleaning unit is considered; control interface and any site air requirement; 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
Send your material and process conditions
We can review the process point, material shape, iron source, capacity, available space and cleaning method before recommending a magnetic separator layout.
Frequently Asked Questions
What the Magnetic Stage Can Do?
It may capture ferrous wear particles, fastener fragments, wire, or other responsive contamination introduced during harvesting, transport, drying, crushing, screening, conveying, or packing.
Why Chloride and Moisture Matter?
Salt deposits, humidity, brine, washdown, and shutdown conditions can promote pitting and crevice corrosion. Stainless grade selection must be based on the actual chloride exposure, temperature, finish, weld condition, cleaning chemistry, and expected service life.
Why is “Avoid Flow Restriction” important for this decision?
Fine or damp salt may cake on tubes and bridge across a grate. A tighter array is not automatically better if it blocks the stream.