Sorting Equipment Focus: Keeping Time


Courtesy of Eriez Magnetics Europe Ltd

(From Recycling Today Magazine)

In with the new, out with the old. A reversal of an old adage is perhaps the best way to describe the increased demand for America’s scrap metals. The world’s hunger for new cars, appliances and buildings was a boon for steel makers in 2004.  Global steel production exceeded 1 billion tons last year, a record amount. And as the need for “new” steel products increases, the output volume—and price—of processed scrap metal has soared. 

To keep up with the high demand, leaders in the scrap industry are investing in new processing equipment. 

A scrap metal recycler in the Southeast recently unveiled a new state-of-the-art shredder. The new 7,000-hp shredder processes cars and other ferrous scrap.

The size and volume of the downstream run of scrap coming off the new shredder required a high-volume ferrous metal separator.  The company turned to Eriez Magnetics of Erie, Pa. 


Magnetic equipment is used to recover ferrous and nonferrous metals from automobile shredder streams, as welll as from solid waste, electronic/computer scrap and bottom ash.

Three common magnet technologies are used in ferrous scrap recovery: drum, belt and pulley magnets. Downstream from auto shredders, the most effective systems will use a combination of two or even all three configurations to effectively separate ferrous scrap from the other material that is present.

It’s important that the processor understand that each of the top three magnet configurations is designed for certain applications. However, drum magnets require material to be shredded thoroughly, and it was an innovative drum magnet solution that was needed for this particular application.

Drum magnets are positioned so that material cascades over a rotating shell of a stationary drum. Inside the drum, a magnetic element projects a field within a certain arc, carrying the ferrous material past a splitter and enabling it to drop the material on the opposite side. Cleats on the outer shell of the drum aid in moving the material.

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