Recovery of aluminum and other metal values from fly ash
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsWilliam J. McDowell, Forest G. Seeley
Life of this patent
Estimating the term…
Abstract
The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.
Claims6
A method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.
Dependencies are inferred from the claim text.