Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1980-03-21
1980-12-30
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423128, 423132, 106103, C01F 726
Patent
active
042423139
ABSTRACT:
Processes for the production of alumina and cement constituents from fly ash, in which the fly ash is subjected to magnetic separation removing magnetic constituents; the remaining non-magnetic fraction of fly ash is then mixed with a calcining agent and water, pelletized, dried and calcined, cooled, and then either acid cured or subjected to a hydrothermic shock treatment in sulfuric acid; the mixture is then diluted with water, filtrated, purified by a solvent extraction process, and evaporated yielding aluminum sulfate, which is then subjected to liquid-solid separation and decomposed at an increased temperature at which the sulfur in the form of sulfur oxide gases and the water vapor is driven off, alumina remains. The leach residue of the alumina extraction yields useful material for cement production.
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patent: 3393975 (1968-07-01), Mitchell
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Condry, "Coal Research Bureau, Report No. 130", 1976, West Va. Univ., Morgantown, W. Va., 8 pages.
Carter Herbert T.
Extraction Research & Development, Inc.
Keller Walter R.
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