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Title: 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:
 [1];  [1]
  1. (Ames, IA)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
OSTI Identifier:
864567
Patent Number(s):
US 4386057
Application Number:
06/358,958
Assignee:
United States of America as represented by United States (Washington, DC) AMES
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}
}

Patent:

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