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Method for argon-oxygen refining low-phosphorus ferrochrome

A ferrochrome alloy, argon-oxygen refining technology, applied in the field of argon-oxygen refined ferrochrome alloy dephosphorization and carbon reduction and chromium preservation, can solve the problems of carbon reduction efficiency reduction, chromium loss, difficulty in carbon reduction and chromium preservation, and achieve high-efficiency dephosphorization Effect

Inactive Publication Date: 2012-12-05
CHANGCHUN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above shows that a lower melt temperature and a suitable range of melt carbon content can be beneficial to further dephosphorization, but argon oxygen refining at a lower melt temperature will cause a large amount of chromium loss and reduce the carbon reduction efficiency. Therefore, it is difficult to achieve the purpose of reducing carbon and maintaining chromium

Method used

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  • Method for argon-oxygen refining low-phosphorus ferrochrome

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The consistent conditions used in the experiments of multiple examples are: 1) The argon-oxygen refining furnace is a 5-ton top-bottom double-blown converter; 2) Each furnace of ferrochrome melt is 4 tons; 3) The dephosphorization agent uses commonly used CaO-BaO slag System, composition: 25% calcium oxide-50% barium oxide-15% calcium fluoride-10% iron oxide; 4) high carbon ferrochrome alloy (raw material) carbon content: 7.4~7.6%wt; 5) high carbon ferrochrome alloy ( Raw material) Phosphorus content: 0.05-0.06%wt; 6) Refining temperature is 1780-1820°C.

[0025] Obtained ferrochrome alloy melt dephosphorization experimental data by argon-oxygen refining a plurality of embodiments is as shown in table 1, can see, in the dephosphorization carbon content of the present invention 3.0~5.5%wt, dephosphorization time 10~30 minutes , The elevation distance of the top gun position is 10-50 cm, the top-blowing flow rate is 3.0-4.0 cubic meters per ton of melt per minute, the top...

Embodiment 2

[0028] 1) Initial high-temperature carbon reduction: the high-carbon ferrochrome alloy melt mixed into the argon-oxygen refining converter with top-bottom re-blowing is quickly raised to a high temperature of 1750°C for carbon reduction and refining until the carbon content drops to 5.0%wt , quickly reduce carbon to the carbon content required for dephosphorization at a higher temperature, and the loss of chromium is minimal;

[0029] 2) Melt cooling and slag replacement: reduce the carbon content to 5.0%wt of the ferrochromium alloy melt by re-blowing argon to cool it down, and remove 50% of the original slag during the cooling process, and then put 50 kg / ton of melt The barium oxide-calcium oxide slag-based dephosphorization agent until the temperature drops to 1400°C;

[0030] Rapidly lower the melt to a temperature suitable for dephosphorization, remove part of the high-silicon slag that is not conducive to dephosphorization, and use the high-temperature melt to quickly me...

Embodiment 3

[0035] 1) Initial high-temperature carbon reduction: the high-carbon ferrochrome alloy melt mixed into the argon-oxygen refining AOD furnace with top-bottom re-blowing is quickly raised to a high temperature of 1750°C for carbon reduction and refining until the carbon content drops to 5.0% wt, rapid decarburization to a carbon content suitable for dephosphorization at higher temperatures with minimal loss of chromium;

[0036] 2) Melt cooling and slag replacement: the ferrochromium alloy melt with carbon content reduced to 5.5%wt is cooled by blowing argon again, and at the same time, 50-100% of the original slag is removed during the cooling process, and then 90 kg / ton is added Dephosphorization agent of barium oxide-calcium oxide slag system in the melt until the temperature is lowered to 1550°C;

[0037] Rapidly lower the melt to a temperature suitable for dephosphorization, remove part of the high-silicon slag that is not conducive to dephosphorization, and use the high-te...

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Abstract

The invention relates to a method for argon-oxygen refining low-phosphorus ferrochrome. The method is characterized by comprising specific steps of: first high-temperature carbon decrease, to be specific, decreasing the carbon rapidly at a relatively high temperature until carbon content needed for dephosphorization is obtained, enabling the chromium loss to be minimum, cooling a melt and replacing the slag for the dephosphorization; and second high-temperature carbon decrease, to be specific, enabling the high-carbon ferrochrome melt to suffer from stepped refining at different temperatures in an argon-oxygen refining furnace based on experimental results beneficial for carbon decrease, chromium keeping and further dephosphorization, that is to say, firstly heating the high-carbon ferrochrome with a carbon content of 7.0-8.0%wt to 1750-1850 DEG C for high-temperature oxidation carbon decrease, cooling the melt to the temperature of 1400-1550 DEG C which is good for the dephosphorization when the carbon in the melt is decreased to a content upper limit of 5.0-5.5%wt which is good for the dephosphorization, then performing dephosphorization within a dephosphorization content range of 3.0-5.5%wt which is good for the dephosphorization, and then heating the melt after the dephosphorization to 1750-1850 DEG C to continue the high-temperature oxidation carbon decrease until the low-carbon ferrochrome is obtained.

Description

technical field [0001] The invention relates to a method for argon-oxygen refining of low-phosphorus ferrochrome alloy, in particular to a method for argon-oxygen refining of ferrochrome alloy for dephosphorization and carbon reduction and chromium preservation. Background technique [0002] Low-carbon ferrochrome alloy is an important raw material for smelting special steel and ultra-low-carbon alloy structural steel. The lower its carbon content, the higher its chromium content and the lower its phosphorus content, the higher its use value and economic value. Phosphorus low-carbon ferrochromium alloy is an important goal pursued by the metallurgical industry. [0003] In recent years, the method of refining high-carbon ferrochrome alloy melts with argon-oxygen refining technology to obtain low-carbon or ultra-low-carbon ferrochrome alloys is a method to replace the "three-step method" and "Perrin method (Perrin)" with high energy consumption and low efficiency. Energy eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/072
Inventor 王淮吴化张德江尤文王佳立
Owner CHANGCHUN UNIV OF TECH
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