Method and composition for use in recycling metal containing furnace dust
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United States of America Patent
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-
Feb 16, 1993
Grant Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Nov 27, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is shown where an arc dust waste produced by an electric arc furnace is conducted to silos and converted to a reusable co-product by means of the addition of a special blend of high calcium and dolomitic quicklime, calcium stearate and pulverized waste paper. The mixture is compressed into compact pellets which, due to their impact integrity and improved shelf life can be pneumatically conveyed intact into storage silos for recycling of the waste electric arc flue dust into the furnace melt. Components of the arc dust deemed leachable and hazardous in landfills, such as zinc, lead and chromium are increased in concentration to a point where it is economical to extract them for resale.
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