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Title: Chemistry of the Calsinter process for aluminum recovery from fly ash

Abstract

In 1977, 48.5 million tons of fly ash was produced in the United States from coal combustion. Based on an estimated average of 11.5% aluminum content in fly ash, this represent 5.58 million tons of aluminum. Similarly, for titanium, a fly ash content of 0.89% corresponds to 0.432 million tons of titanium. Both the Al and Ti quantities in flyash are close to US demand. One method for Al recovery from fly ash, the Calsinter method, is discussed. In this method fly ash is blended with gypsum and limestone. The mixture is pelletized and sintered at 1000 to 1250/sup 0/C. The sinter cake is ground and leached with dilute sulfuric acid. Waste solids are removed by filtration, and metal values are recovered from the filtrate. Aluminum can be recovered from the leach liquor by crystallization as ammonium alum or aluminum sulfate. Other metal values can be recovered by solvent extraction. Flue gas scrubber sludge, resulting from the limestone scrubbing of SO/sub 2/ from flue gas, contains calcium sulfate, calcium sulfite and unreacted calcium carbonate, and can be used instead of the gypsum and limestone. Thus, the Calsinter process becomes more attractive by combining two waste products to recover valuable resources.more » The characterization of fly ash and the Calsinter process material, and the effects of sintering temperature, composition, sintering time, and leach rate on the aluminum recovery are described.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
5510835
Report Number(s):
CONF-800205-3(Draft)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Conference
Resource Relation:
Conference: American Institute of Metallurgical Engineers meeting, Las Vegas, NV, USA, Feb 1980
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ALUMINIUM; MATERIALS RECOVERY; FLY ASH; CHEMICAL COMPOSITION; RECYCLING; TITANIUM; COAL; COMBUSTION; EXPERIMENTAL DATA; FOSSIL-FUEL POWER PLANTS; GRAPHS; INDUSTRIAL PLANTS; LEACHING; SCRUBBERS; SINTERING; SLUDGES; TABLES; WASTE PROCESSING; AEROSOL WASTES; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; DATA; DATA FORMS; DISSOLUTION; ELEMENTS; ENERGY SOURCES; EQUIPMENT; FABRICATION; FOSSIL FUELS; FUELS; INFORMATION; MANAGEMENT; METALS; NUMERICAL DATA; OXIDATION; POLLUTION CONTROL EQUIPMENT; POWER PLANTS; PROCESSING; RECOVERY; SEPARATION PROCESSES; THERMAL POWER PLANTS; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENTS; WASTE MANAGEMENT; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Egan, B Z, Seeley, F G, and Kelmers, A D. Chemistry of the Calsinter process for aluminum recovery from fly ash. United States: N. p., 1980. Web.
Egan, B Z, Seeley, F G, & Kelmers, A D. Chemistry of the Calsinter process for aluminum recovery from fly ash. United States.
Egan, B Z, Seeley, F G, and Kelmers, A D. Tue . "Chemistry of the Calsinter process for aluminum recovery from fly ash". United States.
@article{osti_5510835,
title = {Chemistry of the Calsinter process for aluminum recovery from fly ash},
author = {Egan, B Z and Seeley, F G and Kelmers, A D},
abstractNote = {In 1977, 48.5 million tons of fly ash was produced in the United States from coal combustion. Based on an estimated average of 11.5% aluminum content in fly ash, this represent 5.58 million tons of aluminum. Similarly, for titanium, a fly ash content of 0.89% corresponds to 0.432 million tons of titanium. Both the Al and Ti quantities in flyash are close to US demand. One method for Al recovery from fly ash, the Calsinter method, is discussed. In this method fly ash is blended with gypsum and limestone. The mixture is pelletized and sintered at 1000 to 1250/sup 0/C. The sinter cake is ground and leached with dilute sulfuric acid. Waste solids are removed by filtration, and metal values are recovered from the filtrate. Aluminum can be recovered from the leach liquor by crystallization as ammonium alum or aluminum sulfate. Other metal values can be recovered by solvent extraction. Flue gas scrubber sludge, resulting from the limestone scrubbing of SO/sub 2/ from flue gas, contains calcium sulfate, calcium sulfite and unreacted calcium carbonate, and can be used instead of the gypsum and limestone. Thus, the Calsinter process becomes more attractive by combining two waste products to recover valuable resources. The characterization of fly ash and the Calsinter process material, and the effects of sintering temperature, composition, sintering time, and leach rate on the aluminum recovery are described.},
doi = {},
url = {https://www.osti.gov/biblio/5510835}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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