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Title: Dissolution and recovery of aluminum and other metals from Calsinter process sinter product

Abstract

In the Calsinter process for the recovery of aluminum and other metals, fly ash is sintered with a source of calcium oxide at 1000 to 1200/sup 0/C, and the sinter product leached with dilute sulfuric acid. The leach step parameters have been optimized following a sinter of eastern Tennessee fly ash with limestone. Batch rate studies have shown that near maximum aluminum solubilization was achieved in 1 h at ambient temperature with 4N H/sub 2/SO/sub 4/ at 20% pulp density. A three-stage batch countercurrent leach system was operated under steady-state conditions in which only 2.2 moles of H/sub 2/SO/sub 4/ were required per mole of Al/sub 2/O/sub 3/ solubilized. Solubilization of aluminum (97%), iron (97%), titanium (82%), and a number of trace metals was obtained. Solvent extraction, employing a primary amine, removed 100% of the iron and 95% of several other metals present in significant concentration from the leach solution and rejected >90% of the aluminum. A cursory examination of the crystallization of ammonium alum from the solvent extraction raffinate showed product decontamination, with respect to Fe/sub 2/O/sub 3/, K/sub 2/O, MnO/sub 2/, and P/sub 2/O/sub 5/, to be excellent. Concentrations of CaO and Na/sub 2/O, however, were above specificationmore » limits.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
5538325
Report Number(s):
CONF-810203-20
ON: DE83015512
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Conference
Resource Relation:
Conference: AIME annual meeting, Chicago, IL, USA, 22 Feb 1981
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ALUMINIUM; MATERIALS RECOVERY; FLY ASH; AQUEOUS SOLUTIONS; DISSOLUTION; LEACHING; SOLVENT EXTRACTION; SULFURIC ACID; AEROSOL WASTES; ASHES; DISPERSIONS; ELEMENTS; EXTRACTION; HYDROGEN COMPOUNDS; INORGANIC ACIDS; MANAGEMENT; METALS; MIXTURES; PROCESSING; RECOVERY; RESIDUES; SEPARATION PROCESSES; SOLUTIONS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Seeley, F G, Felker, L K, and Kelmers, A D. Dissolution and recovery of aluminum and other metals from Calsinter process sinter product. United States: N. p., 1981. Web.
Seeley, F G, Felker, L K, & Kelmers, A D. Dissolution and recovery of aluminum and other metals from Calsinter process sinter product. United States.
Seeley, F G, Felker, L K, and Kelmers, A D. Thu . "Dissolution and recovery of aluminum and other metals from Calsinter process sinter product". United States.
@article{osti_5538325,
title = {Dissolution and recovery of aluminum and other metals from Calsinter process sinter product},
author = {Seeley, F G and Felker, L K and Kelmers, A D},
abstractNote = {In the Calsinter process for the recovery of aluminum and other metals, fly ash is sintered with a source of calcium oxide at 1000 to 1200/sup 0/C, and the sinter product leached with dilute sulfuric acid. The leach step parameters have been optimized following a sinter of eastern Tennessee fly ash with limestone. Batch rate studies have shown that near maximum aluminum solubilization was achieved in 1 h at ambient temperature with 4N H/sub 2/SO/sub 4/ at 20% pulp density. A three-stage batch countercurrent leach system was operated under steady-state conditions in which only 2.2 moles of H/sub 2/SO/sub 4/ were required per mole of Al/sub 2/O/sub 3/ solubilized. Solubilization of aluminum (97%), iron (97%), titanium (82%), and a number of trace metals was obtained. Solvent extraction, employing a primary amine, removed 100% of the iron and 95% of several other metals present in significant concentration from the leach solution and rejected >90% of the aluminum. A cursory examination of the crystallization of ammonium alum from the solvent extraction raffinate showed product decontamination, with respect to Fe/sub 2/O/sub 3/, K/sub 2/O, MnO/sub 2/, and P/sub 2/O/sub 5/, to be excellent. Concentrations of CaO and Na/sub 2/O, however, were above specification limits.},
doi = {},
url = {https://www.osti.gov/biblio/5538325}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

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