Recovery of iron oxide from coal fly ash
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:
-
- Ames, IA
- Issue Date:
- 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
- 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.
Dobbins, Michael S, & Murtha, Marlyn J. Recovery of iron oxide from coal fly ash. United States.
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.
@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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