Getting metal out of salt

All types of salt often contain iron particles originating from the source. This applies especially to salts from the ground.

But very small iron particles also accumulate due to the extraction and refining process, the scraping, sieving and breaking of the crystals. This causes rust, which makes salt discolour: you will then see black specks and brown or red discolouration.

Magnets filter these undesirable iron particles out of the process.

  • 60 years of experience
  • Quality and reliability

Processing salt

Metal particles can be released into the salt not only from the source but also during the processing. For example, worn screw conveyors. Or valves, vibratory feeders and sieve systems.
All potential sources for larger or smaller contaminants, some of which are even invisible to the naked eye.

Almost all of the ferrous particles - including stainless steel 304 - can be removed by using magnetic systems.

Magnetic filtering
magnets for salt

Salt in the chemical industry

The chemical industry uses many salts as raw materials for the extraction of chlorine and lye. Here, too, the raw materials must be pure in composition. Every form of contamination forms a disruption to the production of the end product.

 

In addition, there is a risk of delays in the production process, or even damage to the process equipment if there are iron particles in the raw materials.

These losses are often claimed back from the supplier when it becomes apparent that the source of the pollution lies there and it has not done everything in its power to prevent it.

Food safety

During the entire production process, there is a risk of foreign bodies. These can be a reason to reject or recall complete production batches from the market. The cost of this is incalculable. Not to mention reputational damage.

 

Both the degree of dissolution and the chloride in salt and the sometimes slightly abrasive properties in certain forms mean that the design must be well thought out and the materials and finishing must be of the highest level. This also applies to the magnetic systems for the deferrization process.

Magnetic filters

Magnetic filters for use in salt consist of the highest quality materials and are perfectly finished. That is why in the salt industry we work exclusively with stainless steel 316L, in the highest quality polished, corrosion-resistant finish to prevent any encapsulation of salts and ‘tea stains’ or ‘fly rust’.

We polish the surfaces of the metals with a Ra value of 0.4 µm by means of hygienic fixed-in-drum polishing.
If there is an increased risk of erosion due to extremely abrasive materials, we give the most exposed components an extra hardened coating.

Magnetic filters for pressure lines
magnetic filter for salt

The risks

  • Damage to process machines as a result of unwanted metal
  • Foreign bodies in the end product
  • Rejection due to product contamination
  • Damage claims as a result of foreign bodies
  • Discolouration of the end product
  • Reputational damage due to impurities

The solutions

  • Use of magnets when unloading bulk loads
  • Application of magnets upon entry into the processing plant / storage / silo
  • Interim deferrization during the salt processing
  • Use of magnets as final cleaning and checking of the final product prior to final packaging / shipping

Metal separation - techniques

Magnetic drum separators - for unloading bulk loads.

External pole magnets and bullet magnets - for the unloading of bulk and for the protection of your machinery.

Cleanflow magnets - for loading bulk trucks, as interim cleaning and as final cleaning.

Magnetic filters - for unloading bulk trucks into compressed air pipes and final cleaning of the end product.

Magnetic filtering
magnetic grid for filtering metals in salt

Would you like more information?

Call: +31-(0)40-2213283

or mail: info@goudsmitmagnets.com