Molybdenum oxide ores composite pellets used for argon oxygen refining furnace and preparation method thereof

An argon-oxygen refining furnace and molybdenum oxide ore technology, which is applied in the field of composite pellets, can solve the problems of high temperature in the electrode area, intensified volatilization of molybdenum oxide, and poor reduction kinetic conditions.

Inactive Publication Date: 2014-12-31
BAOSTEEL STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, during the gradual melting of scrap steel, molybdenum oxide volatilizes seriously; the temperature in the electrode area is as high as 2000°C or more

Method used

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  • Molybdenum oxide ores composite pellets used for argon oxygen refining furnace and preparation method thereof
  • Molybdenum oxide ores composite pellets used for argon oxygen refining furnace and preparation method thereof
  • Molybdenum oxide ores composite pellets used for argon oxygen refining furnace and preparation method thereof

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Embodiment 1-8

[0044] In the smelting process of the argon-oxygen refining furnace, before loading the stainless steel mother liquor, lime and lightly burned dolomite of 1 / 3 of the total amount of slag are added, and after igniting and blowing for 2 minutes, the molybdenum oxide ore composite pellets of the present invention are added from the furnace top silo , using the side blowing and strong stirring function of the argon-oxygen refining furnace to make it fully react with the hot metal, a small part of molybdenum oxide that has not undergone reduction reaction, and calcium oxide form calcium molybdate and enter the slag.

[0045] The composition of embodiment 1-8 is referring to table 3:

[0046] Table 3: Molybdenum Oxide Composite Pellet Ratio of Each Component

[0047]

[0048] In the argon-oxygen refining furnace with a nominal capacity of 120 tons, the steel type is stainless steel 316L, the process path adopts the electric furnace + AOD + VOD method, the mother liquor [C] of the...

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Abstract

The invention discloses molybdenum oxide ores composite pellets used for an argon oxygen refining furnace, which comprise the following components by weight percentage: 76-85% of molybdena ore, 11-17% of slaked lime and 4-7% of inorganic binder. The invention also provides a preparation method of the pellets, which comprises the following steps: respectively grinding molybdena oxide ore and slaked lime to fine powder, mixing and then adding a binder for uniformly stirring, preparing the pellets with diameter of 10-100mm, then drying the pellets for 8-10 hours under the temperature of 80-250 DEG C, naturally cooling, sealing, and storing. The molybdenum oxide ore enables rapid fusing and reduction, the added slaked lime powder can effectively inhibit volatilization of molybdenum trioxide. When the argon oxygen refining furnace is used for smelting molybdenum-containing stainless steel, a proper amount of molybdenum oxide ores composite pellets can be added, yielding rate of molybdenum element in the pellets during a smelting process can be increased, a white slag refining principle during a reduction process in the argon oxygen refining furnace is used, and thereby the yielding rate of the molybdenum oxide ores composite pellets can reach more than 97%.

Description

technical field [0001] The invention relates to a raw and auxiliary material for iron and steel metallurgy, in particular to a composite pellet used in an argon-oxygen refining furnace and a preparation method for the pellet. Background technique [0002] Molybdenum is one of the best alloying elements to improve the strength, toughness and corrosion resistance of steel. At present, ferromolybdenum alloy is used for molybdenum alloying in the steelmaking process of argon oxygen refining furnace. Ferromolybdenum is a ferroalloy smelted from molybdenum oxide minerals. During the whole production process, the environmental pollution is large, and the energy consumption and production cost are high. Moreover, during the smelting in the argon-oxygen refining furnace, after the reduction and micro-alloying, in order to prevent the carburization of molten steel in the later stage, the carbon content of ferromolybdenum is particularly strict, resulting in a further increase in produ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B1/243
Inventor 池和冰徐文杰邵世杰郑皓宇杨勇明
Owner BAOSTEEL STAINLESS STEEL
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