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Article: Preheaters save energy. (preheating of electric furnaces eliminates free water and volatile contaminants of scrap metal)
- Article from:
- Modern Casting
- Article date:
- January 1, 1992
- Author:
CopyrightCOPYRIGHT 1992 American Foundry Society, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Foundry scrap is discarded metal, much of it garden variety junk. In its as-delivered condition, or because of its storage conditions, scrap can contain water, rust, oil and grease, slag, wood and other materials.
These contaminants are a potential hazard to the crews responsible for charging induction melting furnaces. Adding wet, rusty and oily charge materials to a molten bath of iron in an electric furnace is risky. The presence of water is critical. The result can be an explosive reaction sending molten metal hurtling out of the furnace, seriously damaging furnace linings and obviously endangering lives.
Why Preheat?
The melter's best ...