Composite briquettes for electric furnace charge, and in their method of use

Inactive Publication Date: 2007-03-08
VABEXCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] I have now discovered that a briquette for transporting carbon fines into a melt can be manufactured in which the “second quantity” mentioned above (iron, chromium, etc.) is omitted or substantially omitted, so long as there is present (along with the carbon) a sufficient quantity of a material selected from the group consisting of lime, dolime, magnesia, limestone, dolomite, magnesium carbonate, and any mixtures thereof. It appears that the compounds just mentioned are able to suppress the slippery nature of the carbon fines, and to densify the briquette sufficiently to cause it to sink int

Problems solved by technology

Carbon is an essential part of the charge, but is quite slippery in its pulverized form (often called “carbon fines”).
Another problem had to do with the density of carbon, which is quite low compared

Method used

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  • Composite briquettes for electric furnace charge, and in their method of use
  • Composite briquettes for electric furnace charge, and in their method of use

Examples

Experimental program
Comparison scheme
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Example

DETAILED DESCRIPTION OF THE DRAWINGS

[0055] A dual shell electric furnace 10 has the following basic components: [0056] 1. a first furnace shell 12 shaped essentially as an open-topped container adapted to hold a steel melt; [0057] 2. a second furnace shell 14 substantially similar to the shell 12; [0058] 3. a cover 16 swingable between an open position (that shown in FIG. 1) and a closed position in which it substantially closes the open top of the first shell 12; [0059] 4. a cover 18 swingable between an open position (that shown in FIG. 1) and a closed position in which it substantially closes the open top of the second shell 14; [0060] 5. an electrode cover 20 which can close either of the shells selectively, the electrode cover being movable between the shells, and also being capable of assuming an out-of-the-way location. The electrode cover 20 is illustrated as having three electrodes 21 passing through the cover, although the number of electrodes is not critical. When the co...

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Abstract

For use with an electric steelmaking furnace, a briquette is provided which incorporates a suitable binder, a first quantity of carbon fines, and a second quantity of a material in powdered form, the latter material being selected from the group consisiting of lime, dolime, limestone, dolomite, magnesia, magnesium carbonate, other suitable carbonates, and mixtures thereof. The second quantity being large enough to suppress the slippery nature of the carbon fines, and to density the briquette to the extent necessary to cause it to sink into the furnace melt.

Description

[0001] This invention relates to an improved composition for a densified carbon briquette for use in charging electric furnaces, and an improved method for using such a briquette. BACKGROUND OF THIS INVENTION [0002] In a conventional steelmaking shop using electric furnaces, an electric furnace charge is typically made from a mixture of scrap metal, carbon and a suitable flux such as lime and / or dolime. The scrap metal is usually added in pieces having a minimum dimension of about ½ inch. [0003] It is also known to add specific materials to a furnace charge in the form of briquettes, in which the components are present in pulverized or comminuted form. Carbon is an essential part of the charge, but is quite slippery in its pulverized form (often called “carbon fines”). Consequently, carbon is typically added in a non-pulverized, non-briquetted state, for example as solid pieces of coke. [0004] Another problem had to do with the density of carbon, which is quite low compared generall...

Claims

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Application Information

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IPC IPC(8): C21B3/02C21C7/076
CPCC21C7/0025C22B1/242C22B1/24
Inventor VAYDA, PIERRE
Owner VABEXCO
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