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Title: Advanced research and technology: direct utilization - recovery of minerals from coal fly ash. Technical progress report, 1 January 1981-31 March 1981. [Hi chlor and sintering processes]

Abstract

The purpose of this research is to develop methods to process fly ash for 1) the separation and use of an iron-rich fraction, 2) the recovery of metals (primarily Al and Ti), and 3) use of the process residues. Research on the HiChlor process for the high-temperature chlorination of a fly ash-reductant mixture included investigation of prechlorinations at reduced temperatures to selectively remove iron and titanium, the measurement of gas diffusion rates in delta-alumina pellets, and the consideration of fused salt processes as an alternative to gas-solids reaction. A current cost estimate for the HiChlor process indicates discounted cash flow rates of return for the process of from 6.5 to 43.4 percent. Experiments on the high temperature sintering of limestone-fly ash mixtures include data collected for alumina extractions from sinters prepared using waste materials. High alumina recoveries were obtained from sinters prepared with cement kiln dust, as the lime source, and small amounts of coal refuse. X-ray diffraction measurements were used to identify the soluble and insoluble compounds in several types of sinters. The investigations of the chemical beneficiation of magnetic fly ash to remove alumina and silica indicate that a combination process of a caustic leach and an acidmore » wash will be required for economic processing. The gangue can be extracted by a high temperature caustic process, but the processing conditions and the low solution solubilities due to common ion effects indicate that the equipment and energy requirements will be costly. The use of a combination of caustic leach and acid wash of the magnetic ash residue is effective because the gangue material is dissolved in a caustic solution, then precipitates and is redissolved in a weak acid solution. High-iron content beneficiated magnetic fly ash residues are produced.« less

Authors:
; ;
Publication Date:
Research Org.:
Ames Lab., IA (USA)
OSTI Identifier:
6528361
Report Number(s):
IS-4771
ON: DE81023613
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ALUMINIUM OXIDES; MATERIALS RECOVERY; FLY ASH; CHLORINATION; WASTE PRODUCT UTILIZATION; IRON OXIDES; TITANIUM OXIDES; ALUMINATES; CARBON; ECONOMICS; EXPERIMENTAL DATA; FOSSIL-FUEL POWER PLANTS; HEAVY MEDIA SEPARATION; IRON ORES; LIMESTONE; MINERAL WASTES; SINTERING; SULFUR; USES; AEROSOL WASTES; ALUMINIUM COMPOUNDS; ASHES; CARBONATE ROCKS; CHALCOGENIDES; CHEMICAL REACTIONS; COAL PREPARATION; COMMINUTION; DATA; ELEMENTS; FABRICATION; HALOGENATION; INFORMATION; IRON COMPOUNDS; MANAGEMENT; NONMETALS; NUMERICAL DATA; ORES; OXIDES; OXYGEN COMPOUNDS; POWER PLANTS; PROCESSING; RECOVERY; RESIDUES; ROCKS; SEDIMENTARY ROCKS; SEPARATION PROCESSES; SOLID WASTES; THERMAL POWER PLANTS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management; 320305 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

Citation Formats

Burnet, G, Dunker, J W, and Murtha, M J. Advanced research and technology: direct utilization - recovery of minerals from coal fly ash. Technical progress report, 1 January 1981-31 March 1981. [Hi chlor and sintering processes]. United States: N. p., 1981. Web.
Burnet, G, Dunker, J W, & Murtha, M J. Advanced research and technology: direct utilization - recovery of minerals from coal fly ash. Technical progress report, 1 January 1981-31 March 1981. [Hi chlor and sintering processes]. United States.
Burnet, G, Dunker, J W, and Murtha, M J. 1981. "Advanced research and technology: direct utilization - recovery of minerals from coal fly ash. Technical progress report, 1 January 1981-31 March 1981. [Hi chlor and sintering processes]". United States.
@article{osti_6528361,
title = {Advanced research and technology: direct utilization - recovery of minerals from coal fly ash. Technical progress report, 1 January 1981-31 March 1981. [Hi chlor and sintering processes]},
author = {Burnet, G and Dunker, J W and Murtha, M J},
abstractNote = {The purpose of this research is to develop methods to process fly ash for 1) the separation and use of an iron-rich fraction, 2) the recovery of metals (primarily Al and Ti), and 3) use of the process residues. Research on the HiChlor process for the high-temperature chlorination of a fly ash-reductant mixture included investigation of prechlorinations at reduced temperatures to selectively remove iron and titanium, the measurement of gas diffusion rates in delta-alumina pellets, and the consideration of fused salt processes as an alternative to gas-solids reaction. A current cost estimate for the HiChlor process indicates discounted cash flow rates of return for the process of from 6.5 to 43.4 percent. Experiments on the high temperature sintering of limestone-fly ash mixtures include data collected for alumina extractions from sinters prepared using waste materials. High alumina recoveries were obtained from sinters prepared with cement kiln dust, as the lime source, and small amounts of coal refuse. X-ray diffraction measurements were used to identify the soluble and insoluble compounds in several types of sinters. The investigations of the chemical beneficiation of magnetic fly ash to remove alumina and silica indicate that a combination process of a caustic leach and an acid wash will be required for economic processing. The gangue can be extracted by a high temperature caustic process, but the processing conditions and the low solution solubilities due to common ion effects indicate that the equipment and energy requirements will be costly. The use of a combination of caustic leach and acid wash of the magnetic ash residue is effective because the gangue material is dissolved in a caustic solution, then precipitates and is redissolved in a weak acid solution. High-iron content beneficiated magnetic fly ash residues are produced.},
doi = {},
url = {https://www.osti.gov/biblio/6528361}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {5}
}

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