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US 4,116,679 AGranted
Metallized iron briquet
AssigneeMidrex Corporation
InventorWolfgang B. Pietsch
Life of this patent
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Abstract
The method of making a briquet from directly reduced finely divided metallized material is disclosed whereby 85 to 95% of metallized material is mixed with 5 to 15% of a binder to form a free flowing briquet feed, then densifying the feed material and forming it into briquets.
Claims6
A method of making a briquet from directly reduced finely divided metallized material, comprising:
- mixing from 85 to 95 percent finely divided metallized material with from 5 to 15 percent of binder comprising:
- about 2 to about 40 percent pitch,
- about 15 to about 35 percent hydrated lime,
- about 15 to about 30 percent of a solution of sodium silicate, and up to 50 percent water;
- to form a free flowing yet dense briquet feed material;
- densifying said feed material, and
- forming said feed material into briquets.
4 more elements
A method of recovering substantially all fines from the operation of a direct reduction furnace comprising:
- A. separating fine oxide material from coarse feed stock,
- B. continuously charging a direct reduction furnace with said coarse feed stock,
- C. simultaneously maintaining a constant flow of fine material to said furnace,
- D. reducing said coarse feed stock and said fine material in said furnace to at least 85% metallization.
- E. removing spent reducing gas as dust-laden top gas from said furnace and collecting the dust therefrom as fines,
- F. collecting fine material from the product,
- G. feeding the collected fines to an agglomerating plant,
- H. mixing about 85 to 95 percent of said fines with about 5 to about 15 percent of a binder comprising:
- about 2 to about 40 percent pitch,
- about 15 to about 35 percent hydrated lime,
- about 15 to about 30 percent of a solution of sodium silicate, and up to about 50 percent water;
- I. densifying the feed material -- binder mixture;
- and
- J. forming the mixture into agglomerates suitable for feed material to iron and steelmaking furnaces.
11 more elements
Dependencies are inferred from the claim text.