Process for the recovery of alumina from fly ash

Murtha, M J

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Title: Process for the recovery of alumina from fly ash

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Abstract

An improvement in the lime-sinter process for recovering alumina from pulverized coal fly ash is disclosed. The addition of from 2 to 10 weight percent carbon and sulfur to the fly ash-calcium carbonate mixture increase alumina recovery at lower sintering temperatures.

Inventors:: Murtha, M J

Issue Date:: Tue Aug 09 00:00:00 EDT 1983

OSTI Identifier:: 7159468

Patent Number(s):: 4397822

Application Number:: PPN: US 6-424703

Assignee:: PTO; EDB-94-121146

DOE Contract Number:: W-7405-ENG-82

Resource Type:: Patent

Resource Relation:: Patent File Date: 27 Sep 1982

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; ALUMINIUM OXIDES; MATERIALS RECOVERY; FLY ASH; ADDITIVES; CALCIUM CARBONATES; LIME-SODA SINTER PROCESS; OPTIMIZATION; AEROSOL WASTES; ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; ASHES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; CHALCOGENIDES; COMBUSTION PRODUCTS; MANAGEMENT; OXIDES; OXYGEN COMPOUNDS; PROCESSING; RESIDUES; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management; 200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions

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                    Murtha, M J. Process for the recovery of alumina from fly ash.  United States: N. p., 1983. 
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                    Murtha, M J. Process for the recovery of alumina from fly ash.  United States.

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                    Murtha, M J. Tue .  
        "Process for the recovery of alumina from fly ash".  United States.

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@article{osti_7159468,

  title        = {Process for the recovery of alumina from fly ash},

  author       = {Murtha, M J},

  abstractNote = {An improvement in the lime-sinter process for recovering alumina from pulverized coal fly ash is disclosed. The addition of from 2 to 10 weight percent carbon and sulfur to the fly ash-calcium carbonate mixture increase alumina recovery at lower sintering temperatures.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Aug 09 00:00:00 EDT 1983},

  month        = {Tue Aug 09 00:00:00 EDT 1983}

}

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Process for the recovery of alumina from fly ash

Patent Murtha, Marlyn J [Ames, IA]

An improvement in the lime-sinter process for recovering alumina from pulverized coal fly ash is disclosed. The addition of from 2 to 10 weight percent carbon and sulfur to the fly ash-calcium carbonate mixture increase alumina recovery at lower sintering temperatures.
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Coal cleaning waste as an additive in the lime-sinter process for the recovery of alumina from power plant fly ash

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The addition of a small amount of coal cleaning waste to lime-fly ash mixtures increases the alumina recovery to over 90%. Experiments were run with sinter mixtures containing bituminous and subbituminous fly ashes and varying amounts of lime and coal cleaning waste. The various mixtures were sintered between 1000/sup 0/C and 1350/sup 0/C for 0.5 to 1 hours. Alumina recovery and qualitative and quantitative x-ray diffraction analysis were obtained for each sample. Alumina compounds that have been identified in the sintered mixtures are: calcium alumina ferrite (C/sub 4/AF), calcium aluminate (C/sub 12/A/sub 7/), calcium sulfoaluminate (C/sub 4/A/sub 3/S), and gehlenitemore » « less
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The efficiency of alumina recovery from coal fly ash by the lime-sinter process is improved by the addition of a small amount of coal cleaning refuse. Approximately 5.0 wt % refuse increases alumina recovery from 55% to 90% for subbituminous coal ashes and reduces the required sintering temperature from 1380 to 1200/sup 0/C. Mixtures of fly ash and various amounts of coal cleaning refuse and limestone are sintered at different temperatures and lengths of time to determine the optimum processing conditions. X-ray diffraction analysis is used to obtain qualitative and quantitative information about the alumina compounds formed during sintering andmore » « less
New developments in the lime-soda sinter process for recovery of alumina from fly ash

Conference Murtha, M J; Burnet, G

A further investigation of the lime-soda sinter process has resulted in unique correlations between sinter composition and yield of alumina for fly ashes from both bituminous and subbituminous coals. Either an excess or deficiency of limestone or soda ash compared to the quantities called for by the correlations will reduce the recovery of alumina below the better than 90 percent level otherwise attainable. No apparent difference in reactivity was found between the calcium contained in the fly ashes and that in the added limestone. Lower sintering temperatures can be used for fly ashes from subbituminous coals. Process economics are determinedmore » « less
Full Text Available
Recovery of aluminum and other metal values from fly ash

Patent McDowell, W J; Seeley, F G

The invention 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.

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