Recovery of iron oxide from coal fly ash

Dobbins, Michael S; Murtha, Marlyn J

Title: Recovery of iron oxide from coal fly ash

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Abstract

A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the fly ash is separated and treated with a hot strong alkali solution which dissolves most of the silica and alumina in the fly ash, leaving a solid residue and forming a precipitate which is an acid soluble salt of aluminosilicate hydrate. The residue and precipitate are then treated with a strong mineral acid to dissolve the precipitate leaving a solid residue containing at least 90 weight percent iron oxide.

Inventors:

Dobbins, Michael S ^[1]; Murtha, Marlyn J ^[1]

Ames, IA

Issue Date:: 1983-05-31

Research Org.:: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)

OSTI Identifier:: 864567

Patent Number(s):: 4386057

Application Number:: 06/358,958

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C - CHEMISTRY C21 - METALLURGY OF IRON C21B - MANUFACTURE OF IRON OR STEEL

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
C01G49/06 - Ferric oxide

C - CHEMISTRY C21 - METALLURGY OF IRON C21B - MANUFACTURE OF IRON OR STEEL
C21B13/006 - {Starting from ores containing non ferrous metallic oxides}

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
C22B21/0023 - {from waste materials}
C22B3/06 - in inorganic acid solutions {, e.g. with acids generated in situ
C22B7/02 - Working-up flue dust

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
Y02P10/134 - by CO2 avoidance
Y02P10/20 - Process efficiency

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

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: recovery; iron; oxide; coal; fly; ash; quality; concentrate; suitable; feed; blast; electric; reduction; furnaces; recovered; pulverized; magnetic; portion; separated; treated; hot; strong; alkali; solution; dissolves; silica; alumina; leaving; solid; residue; forming; precipitate; acid; soluble; salt; aluminosilicate; hydrate; mineral; dissolve; containing; 90; weight; percent; mineral acid; coal fly; acid soluble; pulverized coal; fly ash; weight percent; iron oxide; solid residue; soluble salt; alkali solution; residue containing; percent iron; strong alkali; magnetic portion; /423/

Citation Formats


                    Dobbins, Michael S, and Murtha, Marlyn J. Recovery of iron oxide from coal fly ash.  United States: N. p., 1983. 
        Web.

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                    Dobbins, Michael S, & Murtha, Marlyn J. Recovery of iron oxide from coal fly ash.  United States.

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                    Dobbins, Michael S, and Murtha, Marlyn J. Tue .  
        "Recovery of iron oxide from coal fly ash".  United States.  https://www.osti.gov/servlets/purl/864567.

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@article{osti_864567,

  title        = {Recovery of iron oxide from coal fly ash},

  author       = {Dobbins, Michael S and Murtha, Marlyn J},

  abstractNote = {A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the fly ash is separated and treated with a hot strong alkali solution which dissolves most of the silica and alumina in the fly ash, leaving a solid residue and forming a precipitate which is an acid soluble salt of aluminosilicate hydrate. The residue and precipitate are then treated with a strong mineral acid to dissolve the precipitate leaving a solid residue containing at least 90 weight percent iron oxide.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1983},

  month        = {5}

}

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