发明名称 |
Recovery of iron oxide from coal fly ash |
摘要 |
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.
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申请公布号 |
US4386057(A) |
申请公布日期 |
1983.05.31 |
申请号 |
US19820358958 |
申请日期 |
1982.03.17 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
DOBBINS, MICHAEL S.;MURTHA, MARLYN J. |
分类号 |
C01G49/06;C21B13/00;C22B3/06;C22B7/02;C22B21/00;(IPC1-7):C01G49/02 |
主分类号 |
C01G49/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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