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Method for refining metal by different oxygen refining sequence

A technology for refining metals and molten metals, applied in the direction of improvement of process efficiency, furnaces, manufacturing converters, etc., can solve the problems of increasing wear and unsatisfactory oxygen nozzles

Inactive Publication Date: 2006-07-26
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is still unsatisfactory due to the increased wear of the oxygen nozzle

Method used

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  • Method for refining metal by different oxygen refining sequence
  • Method for refining metal by different oxygen refining sequence
  • Method for refining metal by different oxygen refining sequence

Examples

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and its use in a BOP.

[0025] figure 1 A basic oxygen furnace 20 is shown in which a charge 21 is refined to produce steel. Charges typically include molten iron, such as hot metal from a blast furnace, steel shavings, and a slagging agent such as lime, dolomitic lime, or fluorspar. The charge typically has a silicon concentration of about 0.05 to 2.0% by weight and a carbon concentration of about 4 to 4.5% by weight.

[0026] Refined oxygen is injected into the headspace 24 of the furnace 20 from the oxygen lance 22 in one or more gas jets 23 throughout the first stage of the oxygen blowing period or the light blowing period. exist figure 1 In the embodiment shown, multiple gas jets 23 are used. Throughout the first stage of the oxygen blowing period, an oxygen-containing stream containing at least about 80% oxygen, preferably pure oxygen, is injected in the form of...

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Abstract

A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent period refining oxygen is provided into the furnace headspace surrounded by a flame shroud.

Description

technical field [0001] The present invention generally relates to metal refining in which oxygen is supplied to molten metal from above the surface of the molten metal. The invention is particularly useful in steel refining processes, such as basic oxygen furnace steelmaking. Background technique [0002] During metal refining, such as the production of steel using basic oxygen furnace steelmaking (BOP), oxygen is fed into the metal bath to react with components of the molten metal, some of the molten metal is incorporated into the slag, The slag and molten metal together form the molten pool. These reactions provide heat to the molten metal to help maintain the metal in a molten state and also remove undesired components to obtain the desired melt chemistry for the final product. [0003] Oxygen can be supplied to the molten pool from above the surface of the molten pool, such as in BOP operations, or from below the surface of the molten pool, such as in rapid basic oxyge...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/32C21C5/46C21C5/52C21C7/04C21C7/068
CPCC21C5/4606C21C5/32C21C7/068C21C7/04C21C5/5217Y02P10/20
Inventor B·萨马R·J·塞林斯J·E·安德森W·J·马霍尼
Owner PRAXAIR TECH INC
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