Plasma heated furnace for iron ore pellet induration

a technology of iron ore pellets and plasma furnaces, which is applied in the field of induration of iron ore concentrate pellets, can solve the problems of not having an optimal composition as drying gas, not being able to prevent, and producing very important amounts of cosub>2, so as to reduce the generation of co2

Inactive Publication Date: 2018-03-29
PYROGENESIS CANADA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly reduces CO2 emissions, increases energy transfer efficiency, and provides a dry gas for drying, minimizing pollution and energy consumption.

Problems solved by technology

In the case of the processing of pellets fired in a kiln, such as, for example in a Metso plant, it is not possible to prevent exposure of the pellets to the radiant heat from the flame of the kiln single burner installed on the kiln axis, although tumbling of the pellets in the rotating kiln may minimize overheating.
The combustion, in the burners, of natural gas, heavy oil and / or pulverized coal results, unfortunately, in the production of very important amounts of CO2.
Furthermore, the combustion gases, which are used to dry the ore pellets, are, in addition to CO2, composed of water vapor, which is not an optimal composition as a drying gas.

Method used

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  • Plasma heated furnace for iron ore pellet induration
  • Plasma heated furnace for iron ore pellet induration
  • Plasma heated furnace for iron ore pellet induration

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Embodiment Construction

[0030]The present pelletizing apparatus uses a plasma heated furnace to reduce, or even eliminate, the generation of CO2 in an iron ore pelletizing process, to increase the energy transfer efficiency of the pellet heating process, and to provide a dry gas (air) in the green pellets drying section. Plasma torches are used to heat the induration furnace in place of the conventional natural gas, heavy oil or / and pulverized coal burners and, in doing so, to contribute to reducing considerable pollution of the atmosphere and saving energy.

[0031]For a conventional burner section of the firing zone equipped, for example a 3.75 MW Metal7 burner, the required combustion air consumption would be about 3500 Nm3 / h. By contrast, given both the facts that no combustion air is required and the higher heat transfer efficiency of the substitute plasma torch, as illustrated in FIG. 2, the air flow required would be only about 430 Nm3 / h with the present plasma heated furnace.

[0032]In the induration tu...

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Abstract

In the present pelletizing apparatus, the induration of iron ore concentrate pellets is achieved in a tunnel furnace heated by plasma torches, wherein the generation of CO2 by the conventional iron ore pelletizing processes is reduced by using electricity powered plasma torches instead of burning natural gas, heavy oil or pulverized coal in burners, thereby reducing considerably industrial pollution of the atmosphere.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Application claims priority on U.S. Provisional Application No. 61 / 566,403, now pending, filed on Dec. 2, 2011, which is herein incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to the induration of iron ore concentrate pellets.BACKGROUND OF THE INVENTION[0003]In the face of shrinking world reserves of high-grade iron ore, low-grade ores are used, which must be concentrated before further processing. The concentrated iron ore fines obtained cannot be used as such, for example in a blast furnace to produce pig iron or to produce sponge iron in a direct reduction iron plant (DRI).[0004]The fines have first to be mixed with additives such as bentonite or other binders such as described for example in U.S. Pat. No. 5,685,893 issued to Field et al., and then shaped into small lumps, the pellets, which are then hardened by firing in a furnace at temperature up to 1350° C.[0005]The total world production of...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22B1/24
CPCF27B21/06C22B1/2406C22B1/2413C22B1/20H05H1/44H05H1/34Y02P10/143H05H2001/3452H05H1/3452
InventorDROUET, MICHEL G.CARABIN, PIERRE
OwnerPYROGENESIS CANADA INC