Desulfurizing agent and application thereof as well as molten iron krypton (KR) desulfurization method

A desulfurizer and molten iron technology, applied in the desulfurization field of desulfurizer and molten iron KR method, can solve the problems of unsuitable vanadium-containing molten iron, and achieve obvious environmental protection and economic effects, high desulfurization efficiency, and reduced iron inclusion

Active Publication Date: 2013-04-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the particularity of components and properties of vanadium-containing molten iron, the above three desulfurizers are not suitable for desulfurization of vanadium-containing molten iron. In the prior art, there is no desulfurizer suitable for desulfurizing vanadium-containing molten iron.

Method used

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  • Desulfurizing agent and application thereof as well as molten iron krypton (KR) desulfurization method

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preparation example Construction

[0024] The preparation method of the desulfurizer of the present invention is to grind lime, fluorite, calcium carbide, soda ash and aluminum ash into a powder of ≤2mm, and mix them in proportion. Those skilled in the art should understand that calcium carbide is contained in the desulfurizer, and calcium carbide is easy to deliquescence when exposed to water or air, so during preparation, storage and transportation, contact with water should be avoided as much as possible, for example, when the raw materials of each component are mixed uniformly in proportion , packed in a woven bag with a waterproof inner lining, sealed and packaged, unpacked and placed in a nitrogen-sealed silo when in use.

[0025] When the desulfurizing agent of the present invention is in use, the desulfurizing agent is opened and loaded into a high-level silo, and the air is isolated with dry nitrogen. After the stirring head is completely immersed in molten iron and stirring is started, the desulfurizin...

Embodiment 1

[0047] Lime (content of calcium oxide is 85% by weight), fluorite (content of calcium fluoride is 85% by weight), calcium carbide (content of calcium carbide is 85% by weight), aluminum ash (content of aluminum is 25% by weight) , the content of Al2O3 is 30% by weight) and soda ash (the content of sodium carbonate is 98% by weight) and ground into a powder with a particle diameter≤2mm, and then put it into the mixture in a mass ratio of 35:20:20:15:10 Mix and stir in the sand machine, and get the desulfurizer after stirring evenly, put it into a sealed package with a waterproof lining woven bag, transport it to the production workshop, unpack it and put it into a nitrogen-sealed silo. After the vanadium-containing molten iron enters the desulfurization station, the scum on the surface of the molten iron is removed to expose the molten iron. After the slag is removed, 75% of the molten iron on the surface of the molten iron in the tank is exposed by visual inspection. The sulfur...

Embodiment 2

[0049] Lime (content of calcium oxide is 90% by weight), fluorite (content of calcium fluoride is 80% by weight), calcium carbide (content of calcium carbide is 80% by weight), aluminum ash (content of aluminum is 20% by weight) , the content of aluminum oxide is 50% by weight) and soda ash (the content of sodium carbonate is 98% by weight) and ground into a powder with a particle diameter of ≤2mm, and then put it into the mixture in a mass ratio of 30:18:22:20:8 Mix and stir in the sand machine, and get the desulfurizer after stirring evenly, put it into a sealed package with a waterproof lining woven bag, transport it to the production workshop, unpack it and put it into a nitrogen-sealed silo. After the vanadium-containing molten iron enters the desulfurization station, the scum on the surface of the molten iron is removed to expose the molten iron. After the slag is removed, 75% of the molten iron on the surface of the molten iron in the tank is exposed visually. The sulfur...

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Abstract

The invention discloses a desulfurizing agent, which is characterized by consisting of the following components in percentage by weight: 25-31% of calcium oxide, 10-20% of calcium fluoride, 10-25% of calcium carbide, 4.5-15% of calcium carbide, 3-6% of alumium and 5-8% of aluminium oxide, wherein the particle diameter of the desulfurizing agent is not greater than 2mm. In addition, the invention discloses an application of the desulfurizing agent in vanadium-containing molten ion krypton (KR) desulfurization and a molten iron KR desulfurization method. The desulfurizing agent disclosed by the invention is applicable to the desulfurization of the vanadium-containing molten ion.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a desulfurizer and its application, and a method for using the desulfurizer to desulfurize molten iron by the KR method. Background technique [0002] In iron and steel materials, the sulfur content directly affects its performance. Excessive sulfur content in the steel will lead to deterioration of the thermal processing performance of the steel, resulting in "hot embrittlement" of the steel; cracks; the plasticity of steel also significantly deteriorates with the increase of sulfur content; in pure iron or silicon steel sheets, the high sulfur content increases the hysteresis loss. So desulfurization has become one of the main goals in iron and steel smelting. Desulfurization of hot metal is considered to be the main method to reduce the metallurgical load of blast furnace and converter and improve technical and economic indicators, and it has also become an indispensabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
Inventor 陈炼戈文荪王建陈永蒋龙奎黄生权易良刚
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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