Recovery of iron oxide from coal fly ash

Patent · Tue May 31 00:00:00 EDT 1983

OSTI ID:864567

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

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1. Ames, IA

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.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
• DOE Contract Number: W-7405-ENG-82
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4386057
• Application Number: 06/358,958
• OSTI ID: 864567
• Country of Publication: United States
• Language: English

Related Subjects

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