Valuable metal recovery method
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United States of America Patent
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Dec 15, 2015
Grant Date -
Mar 13, 2014
app pub date -
Feb 15, 2012
filing date -
Feb 18, 2011
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Abstract
Provided is a method for improving the recovery rate of valuable metals such as cobalt when drying the battery waste of lithium ion batteries and the like. A second alloy excellent in terms of iron-cobalt separation performance and containing a small amount of iron is obtained by performing: a pre-oxidation step (ST20) for roasting and pre-oxidizing battery waste containing aluminum and iron; a melting step (ST21) for obtaining a molten product by melting the battery waste after the pre-oxidation step; a first slag separation step (ST22) for separating and recovering first slag containing aluminum oxide from the molten product; a second oxidation step (ST23) for oxidizing a molten first alloy after the first slag separation step; and a second slag separation step (ST24) for separating and recovering a second slag containing iron from a second alloy after the second oxidation step (ST23).
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