https://www.powtech.de/en/ausstellerprodukte/powtec23/product-10326097/grate-magnets

Grate Magnets provide powerful, permanent magnetic protection against fine and tramp iron contamination. Designed for simple installation in steep-sloped hoppers, odd and irregular-shaped hoppers, floor openings, vertical closed chutes and ducts.
• Ideal for the removal of small, fine tramp iron from dry, free-flowing products
• Available in multiple sizes and configurations
• Stainless steel housing
• Range of strengths available dependant on application – Ferrite or Rare Earth

Headquartered in Erie, Pennsylvania, USA, Eriez Magnetics designs, develops, manufactures and markets specialist industrial magnetic separation equipment, metal detectors and vibratory equipment, on six continents through 12 wholly owned international subsidiaries and an extensive sales representative network.

Eriez produces a comprehensive range of equipment for a variety of bulk handling, mining and recycling applications. Our products work in conjunction to sort, separate and detect ferrous, non-ferrous and stainless steel, which helps to purify products and prevent contamination, whilst eliminating tramp metal that could potentially harm expensive equipment downstream.