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Method for producing technically pure iron for nuclear power

An industrial pure iron and production method technology, applied in the field of iron and steel smelting production, can solve the problems of high raw material requirements, easy return of phosphorus and sulfur in molten steel, and achieve the effect of enhancing the strategic position

Active Publication Date: 2015-11-04
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing smelting method adopts the process route of primary smelting furnace (converter furnace or electric arc furnace) + vacuum furnace. Due to the high tapping temperature, the molten steel is easy to return phosphorus and sulfur.
Moreover, this process has high requirements on raw material conditions, and low-manganese raw materials need to be used for production; at the same time, if the steel is produced by a billet continuous casting machine, casting flocculation is unavoidable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The production method of industrial pure iron for nuclear power uses the following specific processes.

[0033] (1) After desulfurization in the desulfurization station, the molten iron S is 0.006%, and it enters the AOD furnace for demanganization operation. The composition weight percentage of the semi-steel is: C 3.5%, S 0.006%, Si 0.01%, Mn 0.07%, P 0.02%.

[0034] (2) The converter adopts a process of mixing one pot of AOD semi-steel with one pot of desulfurized hot metal. The composition of the molten iron in the converter: C 4.038%, S 0.006%, Si 0.318%, Mn 0.187%, P 0.086%. The tapping temperature is 1598°C, the slag-stopping cone is used to stop the slag, the basicity of the final slag of the converter is 3.0, and the amount of molten steel is 80.9 tons. The weight percentage of molten steel after tapping: C 0.0253%, P 0.0044%, S 0.0060%, Mn 0.05%, and the rest are iron and unavoidable impurities.

[0035] (3) After the converter is tapped, 2.8kg / ...

Embodiment 2

[0038] Embodiment 2: The production method of industrial pure iron for nuclear power uses the following specific processes.

[0039] (1) After desulfurization in the desulfurization station, the molten iron S: 0.004%, enters the AOD furnace for demanganization operation, and the composition weight percentage of the semi-steel is: C: 3.99%, S: 0.004%, Si: 0.01%, Mn: 0.08%, P: 0.051%.

[0040] (2) The converter adopts a process of mixing one tank of AOD semi-steel with one tank of desulfurized hot metal. The composition of the molten iron in the converter: C: 4.486%, S: 0.004%, Si: 0.337%, Mn: 0.161%, P: 0.094%. The tapping temperature is 1616°C, the slag blocking cone is used to block the slag, the basicity of the final slag of the converter is 3.7, and the amount of molten steel is 82.3 tons. The weight percentage of molten steel after tapping: C: 0.0216%, P: 0.0070%, S: 0.0057%, Mn: 0.06%, and the rest is iron and unavoidable impurities.

[0041] (3) After the converter is ...

Embodiment 3

[0044] Embodiment 3: The production method of industrial pure iron for nuclear power uses the following specific processes.

[0045] (1) After desulfurization at the desulfurization station, the molten iron S: 0.004%, enters the AOD furnace for demanganization operation, and the composition weight percentage of the semi-steel is: C: 3.0%, S: 0.003%, Si: 0.01%, Mn: 0.10%, P: 0.040%.

[0046] (2) The converter adopts the process of mixing one tank of AOD semi-steel with one tank of desulfurized hot metal. The composition of the molten iron in the converter: C: 4.512%, S: 0.004%, Si: 0.433%, Mn: 0.268%, P: 0.095%. The tapping temperature is 1629°C, the slag blocking cone is used to block the slag, the basicity of the final slag of the converter is 4.0, and the amount of molten steel is 80.2 tons. The weight percentage of molten steel after tapping: C: 0.0291%, P: 0.0041%, S: 0.0060%, Mn: 0.04%, and the rest is iron and unavoidable impurities.

[0047] (3) After the converter is...

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Abstract

The invention discloses a method for producing technically pure iron for nuclear power. The method includes the steps that after blast furnace molten iron is pretreated and desulfurated, Mn and P of the molten iron are primarily removed through an AOD converter, so that half-molten steel and iron with the low P and S is obtained; the half-molten steel and iron is smelted by a BOF converter and refined by an LF furnace, then the molten steel is subjected to vacuum decarbonization and deoxidation treatment through an RH furnace, and accordingly technically pure iron molten steel can be obtained. According to the method, equipment and investment do not need to be increased, existing equipment is fully used for process combination, and the metallurgy process is reasonably controlled through the AOD converter, the LF furnace and the RH furnace according to the metallurgy theory, so that the purpose of producing the advanced technically pure iron through common ore raw materials is achieved, and the melt-casting demand by nuclear power industrial users is also met. Under the condition that the steel situation is increasingly severe, the cost of the technically pure iron is lowered so that the user needs can be met, and a guarantee is provided for enterprises to promote strategic positions and to continuously dominate high-end customer markets.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting production, in particular to a production method of industrial pure iron for nuclear power. Background technique [0002] Industrial pure iron is an important material for casting and forgings in the nuclear power industry. It has the characteristics of low carbon, low phosphorus, low sulfur and low aluminum. It is used as a flux in nuclear power steel smelting. It can also be used as low carbon stainless steel, powder metallurgy, amorphous Basic materials for special metal materials such as alloys. [0003] Due to the extremely low carbon content of industrial pure iron, undeoxidized steel is used in the converter. At the same time, the thermodynamic conditions of dephosphorization and desulfurization are different, and different processes are required to realize it. The existing smelting method adopts the process route of primary smelting furnace (converter furnace or electric a...

Claims

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Application Information

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IPC IPC(8): C21C3/00C21C7/068C21C7/06C22C33/04
Inventor 戴永刚张治广姬旦旦苏庆林李宝秀李富伟靳晓磊
Owner XINGTAI IRON & STEEL
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