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A method for directly alloying and smelting molybdenum dioxide

A technology of molybdenum dioxide and alloy steelmaking, which is applied in the field of iron and steel metallurgy and alloy steel smelting, can solve the problems of low molybdenum yield rate and increased production cost, and achieve low reducing agent, low steelmaking cost and high density Effect

Active Publication Date: 2018-06-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the volatile characteristics of molybdenum trioxide, when molybdenum trioxide is directly alloyed for steelmaking, a part of the added molybdenum trioxide will volatilize directly, which leads to a low yield of molybdenum; and the +6 valence The reduction of molybdenum to metal molybdenum needs to add reducing agents such as silicon and aluminum to molten steel or molten iron or slag, which increases the production cost

Method used

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  • A method for directly alloying and smelting molybdenum dioxide

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Embodiment 1

[0011] A process for directly alloying molybdenum dioxide to smelt molybdenum-containing alloys. Molybdenum dioxide and carbon powder are mixed and added to the slag according to the mass ratio of 1:0.19. Adjust the composition of molten steel. It is found through experiments that after direct alloying with the molybdenum dioxide of the present invention, the yield of molybdenum is as high as 99.4%.

Embodiment 2

[0013] A process for directly alloying molybdenum dioxide to smelt molybdenum-containing steel. Molybdenum dioxide and silicon powder are mixed and added to the slag according to the mass ratio of 1:0.22. Adjust the composition of molten steel. Experiments show that after direct alloying with the molybdenum dioxide of the present invention, the yield of molybdenum is as high as 99.7%.

Embodiment 3

[0015] A molybdenum dioxide direct alloying process for smelting molybdenum-containing steel. Molybdenum dioxide and aluminum powder are mixed and added to the slag at a mass ratio of 1:0.28. After the molybdenum element content in the molten steel is stable in the late smelting period, molybdenum alloy is added The composition of molten steel. It is found through experiments that after direct alloying with the molybdenum dioxide of the present invention, the yield of molybdenum is as high as 99.4%.

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Abstract

The invention relates to a direct alloying smelting process of molybdenum dioxide, which belongs to the technical field of steel and iron metallurgy alloy steel (iron) smelting. The direct alloying smelting process is characterized in that raw materials containing the molybdenum dioxide are used as a molybdenum source, so as to be added to molten steel or iron or dross, a certain quantity of reducing agent is added to the molten steel or iron or dross, the molybdenum dioxide is reduced by utilizing the reducing agent, and a molybdenum alloy is added to adjust components of the molten steel or iron at the later stage of smelting after the molybdenum content of the molten steel or iron is stabilized. Compared with the prior art, the method has the characteristics of high molybdenum yield, obvious economic benefit and the like, and the defects of high cost, high pollution and easiness in volatilization of molybdenum trioxide during direct alloying steelmaking by using the molybdenum trioxide when a molybdenum and iron smelting alloying process is used for smelting molybdenum steel are overcome.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy and alloy steel (iron) smelting, and relates to a method for directly alloying and smelting molybdenum dioxide. Background technique [0002] Molybdenum is one of the common alloying elements in alloy steel, and working together with other alloying elements can improve the strength, hardness and corrosion resistance of steel materials. The traditional method of smelting molybdenum alloys is to smelt molybdenum ore into ferroalloys, and then add ferroalloys into molten steel for alloying. This process consumes a lot of energy, costs high, and has a large environmental load. At present, there is also a process for direct alloying steelmaking with molybdenum oxide (CN 103469049A). The specific method used is to add molybdenum trioxide raw material for direct alloying to realize the alloying of molybdenum in molten steel or iron. However, due to the volatile characteristics of molyb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00
CPCC21C7/00C22C33/04
Inventor 张国华苟海鹏王璐周国治
Owner UNIV OF SCI & TECH BEIJING