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ALTEK’s Electromagnetic Stirring Technology Reduces Energy Consumption, Dross Generation at Hydro Henderson Facility

Introduction

The Hydro Henderson facility in Kentucky was built in 2000 with a production capacity of 90,000 metric tons of metal annually. The plant processes a mix of customer-generated extrusion scrap, process-generated and end-of-life scrap from processors, and traders and primary metal to fill the plant’s capacity.

The first installation of electromagnetic stirring (EMS) on a reverberatory melter for aluminum scrap was made in 1968 at Kaiser Aluminum 
(Trentwood, Washington, U.S.). However, it was not until the late 1990s that EMS and pumping became more accepted within the industry as the market began to recognize the huge benefits to be gained from stirring furnaces.

There are many different types of devices available to circulate a furnace. EM stirrers are
the system most widely considered in cast houses for indirect (contactless) stirring.
However, the limitations with traditional watercooled EM stirrers are the significant power
requirements necessary to generate the magnetic fields, as well as the concerns with regard to safety and maintenance of the watercooled inductor.