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Title: Recovery of aluminum and other metal values from fly ash

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.

Inventors:
 [1];  [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863810
Patent Number(s):
4252777
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01F - COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
recovery; aluminum; metal; values; fly; ash; described; relates; method; improving; acid; leachability; found; comprises; sintering; prior; leaching; calcium; sulfate-containing; composition; temperature; sulfate; retained; time; sufficient; quantitatively; convert; acid-leachable; form; metal values; time sufficient; fly ash; calcium sulfate; comprises sintering; values found; /423/

Citation Formats

McDowell, William J, and Seeley, Forest G. Recovery of aluminum and other metal values from fly ash. United States: N. p., 1981. Web.
McDowell, William J, & Seeley, Forest G. Recovery of aluminum and other metal values from fly ash. United States.
McDowell, William J, and Seeley, Forest G. Thu . "Recovery of aluminum and other metal values from fly ash". United States. https://www.osti.gov/servlets/purl/863810.
@article{osti_863810,
title = {Recovery of aluminum and other metal values from fly ash},
author = {McDowell, William J and Seeley, Forest G},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

Patent:

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