Salt-soda sinter process for recovering aluminum from fly ash

McDowell, W J; Seeley, F G

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Title: Salt-soda sinter process for recovering aluminum from fly ash

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Abstract

A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na/sub 2/CO/sub 3/ to a temperature in the range 700/sup 0/ to 900/sup 0/C for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acidsoluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.

Inventors:: McDowell, W J; Seeley, F G

OSTI Identifier:: 5410670

Assignee:: TIC; ERA-05-029262; EDB-80-083874

DOE Contract Number:: W-7405-ENG-26

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ALUMINIUM; MATERIALS RECOVERY; FLY ASH; RECYCLING; FLUE GAS; FOSSIL-FUEL POWER PLANTS; RESOURCE CONSERVATION; WASTE PRODUCT UTILIZATION; AEROSOL WASTES; ELEMENTS; GASEOUS WASTES; MANAGEMENT; METALS; POWER PLANTS; PROCESSING; RECOVERY; THERMAL POWER PLANTS; WASTE MANAGEMENT; WASTE PROCESSING; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management

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                    McDowell, W J, and Seeley, F G. Salt-soda sinter process for recovering aluminum from fly ash.  United States: N. p.,  
        Web.

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                    McDowell, W J, & Seeley, F G. Salt-soda sinter process for recovering aluminum from fly ash.  United States.

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                    McDowell, W J, and Seeley, F G. .  
        "Salt-soda sinter process for recovering aluminum from fly ash".  United States.

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@article{osti_5410670,

  title        = {Salt-soda sinter process for recovering aluminum from fly ash},

  author       = {McDowell, W J and Seeley, F G},

  abstractNote = {A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na/sub 2/CO/sub 3/ to a temperature in the range 700/sup 0/ to 900/sup 0/C for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acidsoluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {},

  month        = {}

}

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Salt-soda sinter process for recovering aluminum from fly ash

Patent McDowell, William J [Oak Ridge, TN]; Seeley, Forest G [Oak Ridge, TN]

A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na.sub.2 CO.sub.3 to a temperature in the range 700.degree.-900.degree. C. for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acid-soluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.
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The lime-soda sinter process for resource recovery from fly ash: A new look

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The lime-soda sinter process is one of the earliest and most thoroughly researched and evaluated of the several methods available for resource recovery from fly ash. The principle product, metallurgical grade alumina, is obtained with yields as high as 90% depending upon how much alumina needs to be left in the residue to form acceptable byproduct cement clinker. The process has the advantages of requiring a relatively low sintering temperature (1100-1200{degree}C), using conventional equipment of carbon steel construction, utilizing a variety of calcium and mineralizer raw materials, and producing only a single byproduct consisting of dicalcium silicate that has beenmore » « less
Use of commercial limestone and other commercially available raw materials in the lime-soda sinter process for the extraction of alumina from a sub-bituminous western coal fly ash

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The study of commercial limestone in the Lime-Soda Sinter process has shown that high alumina recoveries are possible using high grade limestones. High recovery sinter compositions using limestone appear to be in the same region as those performed with calcium carbonate reagent, and thus the results demonstrate that high grade limestone can be used as a substitute. Magnesium oxide is a relatively inert material in the sinter reactions. Dolomitic limestones can be used but only the calcium carbonate portion of the rock is reactive. Potassium carbonate is reactive and can replace soda ash; therefore, it is expected that credit canmore » « less
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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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