METHOD FOR THE RECOVERY OF ALUMINIUM FROM ALUMINIUM SCRAP, AND MULTICHAMBER MELTING FURNACE
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United States of America Patent
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Issued Date -
Jan 11, 2024
app pub date -
Nov 26, 2021
filing date -
Dec 3, 2020
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Abstract
Aluminum scrap having organic adhesions is processed to recover aluminum. A hearth of scrap chamber of a multi-chamber melting furnace is batchwise loaded with aluminum scrap where it is heated in low oxygen to convert the organic adhesions on the aluminum scrap into a pyrolysis gas. In a second pretreatment phase, the scrap chamber is heated to the auto-ignition temperature of the pyrolysis gas, wherein at least one air flow is provided in the scrap chamber to produce an ignitable substoichiometric pyrolysis gas/combustion air mixture which is reacted in the scrap chamber in a combustion process. The atmosphere from the scrap chamber is transferred to a post-combustion. A corresponding multi-chamber melting furnace is also provided.
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