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Technology for steel making by directly alloying molybdenum oxide

A technology of alloying steelmaking and molybdenum oxide, which is applied in the field of iron and steel metallurgy and alloy steel smelting, can solve the problems of increasing the consumption of electric energy and refractory materials, prolonging the smelting time, and delaying the start time of fluxing oxygen blowing, etc., to achieve smelting energy consumption The effect of less amount, short alloying smelting time, and reduction of ferromolybdenum smelting links

Active Publication Date: 2013-12-25
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can realize the direct alloying of molybdenum oxide to smelt molybdenum-containing steel, in order to avoid the oxidation of the reducing agent laid in the bottom of the furnace, it is necessary to delay the start time of fluxing oxygen blowing, thus increasing the consumption of electric energy and refractory materials, and prolonging the production time. Smelting time (for example: when 10t electric arc furnace 18t steel tapping target is smelted with 5.58% molybdenum, the smelting time is ≥15min longer than that of ferromolybdenum process, and the average yield can reach 97.2%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A process for directly alloying molybdenum oxide to smelt molybdenum-containing steel, which uses molten iron to mix molybdenum oxide raw materials for reduction to realize the alloying of molybdenum elements in molten iron. Molybdenum oxide raw material is added to the empty molten iron tank, and the molybdenum oxide raw material is mixed with molten iron during the tapping process. After the molten iron is sent to the steelmaking furnace for smelting, the content of molybdenum element in the molten steel is detected, and ferromolybdenum is added according to the requirements of the steel type to make up for the lack of molybdenum in the molten steel. .

[0018] The calculation method for adding molybdenum oxide raw material is: ([Mo] e -[Mo] i )×m Fe / T Mo ; where [Mo] e It is the target Mo content of steel or molten iron smelting, %; [Mo] i Mo content in steel or molten iron before adding molybdenum oxide raw material, %; m Fe is the weight of steel or molten ...

Embodiment 2

[0021] A molybdenum oxide direct alloying process for smelting molybdenum-containing steel, using molten steel mixed with molybdenum oxide raw materials for reduction to achieve alloying of molten steel molybdenum elements, the process method is: first, the mass is MoO 3 (Converted to pure substance) Ferrosilicon powder with a mass of 10~20% is mixed with molybdenum oxide and pressed into agglomerates, and the agglomerates are added to the ladle one minute before the end of converter tapping for steel liquid mixing, and monitored after tapping The content of molybdenum element in molten steel, after the molybdenum content is stable, ferromolybdenum is added according to the requirements of the steel type to supplement the insufficient part of molybdenum element in molten steel.

[0022] All the other are with embodiment 1.

Embodiment 3

[0024] A molybdenum oxide direct alloying process for smelting molybdenum-containing steel, using molten steel mixed with molybdenum oxide raw materials for reduction to achieve alloying of molten steel molybdenum elements, the process method is: the mass is MoO 3 (Converted to pure substance) Limestone with a mass of 15~35% and a mass of MoO 3 (Converted to pure substance) Magnesium oxide with a mass of 0.1~5%, and a mass of MoO 3 (Converted to pure substance) 8~10% carbon powder by mass, the mass is MoO 3 (converted into pure substance) silicon carbide and molybdenum oxide with a mass of 2~15% are mixed and pressed into blocks, and added to an empty ladle. During the tapping process of the electric furnace, molten steel is poured into the ladle for mixing. MoO 3 (Converted to pure substance) 3~10% carbon powder by mass, the mass is MoO 3 (Converted to pure substance) 1~5% calcium carbide by mass, MoO by mass 3 (converted into pure substance) aluminum particles with a mas...

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Abstract

The invention relates to a technology for steel making by directly alloying molybdenum oxide. The technology is characterized in that the smelting process comprises the following steps of a. adding a molybdenum oxide raw material to a container or a smelting furnace which is unfilled with or partially filled with molten steel or iron liquid, then continuously filling the molten steel or iron liquid, and mixing the molybdenum oxide raw material in the molten steel or iron liquid for certain time; b. after the molten steel or iron liquid stands still in the container or the smelting furnace, adding a certain amount of reducing agent to the surface of the molten steel or iron liquid and a slag surface; and c. after the content of a molybdenum element in the molten steel or iron liquid stabilizes in a smelting later period, adding molybdenum-containing alloy so as to adjust the components of the molten steel or iron liquid. The technology has the characteristics that the molybdenum alloying smelting process is simple to operate, the yield of the molybdenum alloy element is high, the alloying smelting time is short, the consumption of smelting energy sources is low and the smelting cost is low; and equipment has wide adaptation and can be applied to the smelting of steel with the molybdenum content of 0.001-15%.

Description

technical field [0001] The invention relates to a direct molybdenum oxide alloying steelmaking process. The invention belongs to the technical field of iron and steel metallurgy alloy steel (iron) smelting. Background technique [0002] Molybdenum is one of the conventional alloying elements in alloy steel because it can work together with other alloying elements in iron and steel materials to improve the performance of iron and steel materials. At present, in the process of smelting molybdenum-containing alloy steel, most alloy steel smelting enterprises adopt the method of adding ferromolybdenum alloy into the smelting furnace to realize the molybdenum element alloying of steel or molten iron, and the ferromolybdenum alloy is passed through the smelting furnace (such as electric furnace) It is produced by reducing molybdenum-containing raw materials (such as molybdenum oxide) with a reducing agent. Therefore, the smelting of molybdenum-containing steels needs to go throug...

Claims

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Application Information

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IPC IPC(8): C22C33/04
Inventor 刘吉刚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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