Base metal recovery
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United States of America Patent
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Apr 4, 2017
Grant Date -
Oct 30, 2014
app pub date -
Dec 12, 2012
filing date -
Dec 12, 2011
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Abstract
A method for plasma treatment of wet metal-containing wastes in which a plasma treatment unit comprises an electrically conductive hearth for holding a layer of slag and optionally a layer of metal produced by the plasma treatment. A graphite electrode is arranged above the hearth, so that, in use, a plasma arc is formed between the electrode and the hearth. One or more inlets for the particulate metal-containing waste are arranged adjacent to the electrode and sufficiently close to the electrode so that, in use, the particulate metal-containing waste fed into the plasma treatment unit falls close to the arc formed between the electrode and the hearth and is heated by the plasma arc before contacting the slag layer such that moisture present in the particulate metal-containing waste is completely volatilized in a head space of the furnace.
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