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Nickel-containing steel production process

A production process and technology for nickel steel, applied in the field of nickel-containing steel production process, can solve the problems of not being optimized well and the degree of cost reduction is limited, so as to optimize the production process, save the smelting and production process, and reduce the production cost. Effect

Inactive Publication Date: 2013-04-17
河北节能耐火材料集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To a certain extent, this invention is beneficial to reduce the cost of smelting steels with a nickel content of 0.10-0.50%, and effectively reduces the dependence on high-priced alloy resources such as electrolytic nickel or ferronickel when the converter produces nickel-containing steel. However, the invention The invention only reflects the reuse of low-nickel pig iron and scrap steel in terms of raw materials, and still needs to blow oxygen and add lime to adjust the alkalinity in the process, without better optimization, so that the degree of cost reduction is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking the preparation of nickel-containing steel with a nickel content of 0.2% as an example, the production process of such nickel-containing steel includes the following steps:

[0027] (1) Preparation of molten iron

[0028] Obtain 4t molten iron with a temperature of 1470℃ in the blast furnace;

[0029] (2) Transfer of molten iron

[0030] Put the molten iron ladle obtained in step (1) into the electric furnace;

[0031] (3) Add laterite nickel ore

[0032] Add 400 kg of laterite nickel ore with a nickel content of 2% to the electric furnace described in step (2) to fully contact the molten iron;

[0033] (4) Smelting

[0034] The molten iron and laterite nickel ore of step (3) are heated, the temperature is increased to 1550°C, and the temperature is maintained at 1550°C for 10 minutes.

[0035] In the above embodiment:

[0036] In the step (1), the mass percentage of the components of the obtained molten iron is: 2.7% Si, 4.1% C, and the balance is Fe;

[0037] In the step (3), ...

Embodiment 2

[0045] Taking the preparation of nickel-containing steel with a nickel content of 0.2% as an example, the production process of this kind of nickel-containing steel is the same as in Example 1, except that in the step (3), the laterite nickel ore is pre-reduced The nickel-containing minerals; the step of pre-reduction treatment of laterite nickel ore is:

[0046] (3.1) After crushing the laterite nickel ore and mixing it with a reducing agent, the particle size of the mixture is 20mm-150mm;

[0047] (3.2) Roast the resulting mixture at 650℃ for 3h;

[0048] Wherein, the reducing agent is carbon powder, and the mass of carbon in the reducing agent is 5% of the mass of nickel in the nickel-containing mineral.

[0049] In the above embodiment, through the pre-reduction treatment of laterite nickel ore, the nickel oxide contained in it is partially reduced and some chemical bonds are in a different degree of activation state, so that it will be contacted with high temperature molten iron ...

Embodiment 3

[0052] Taking the preparation of nickel-containing steel with a nickel content of 0.2% as an example, the production process steps of this nickel-containing steel are the same as those in Example 1, except that:

[0053] In step (1), obtain 4t molten iron with a temperature of 1400°C in a blast furnace;

[0054] In step (4), the laterite nickel ore and molten iron in step (3) are heated, the temperature is increased to 1400°C, and the temperature is maintained at 1400°C for 8 minutes.

[0055] In the above embodiment:

[0056] In the step (1), the mass percentage of the components of the obtained molten iron is: 2.0% Si, 3.6% C, and the balance is Fe;

[0057] In the step (3), the laterite nickel ore has a particle size of 40mm-60mm;

[0058] In the step (4), the heating rate for heating the mixture of nickel-containing minerals and molten iron is 10°C / min.

[0059] The nickel-containing steel obtained by the above-mentioned nickel-containing steel production process has a nickel content ...

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Abstract

The invention relates to a nickel-containing steel production process. The process comprises the following steps: preparing molten iron with the temperature of 1400-1520 DEG C in a blast furnace, transferring the molten iron into a converter or an electric furnace, and adding nickel-containing minerals into the converter or the electric furnace to enable the nickel-containing minerals to contact with the molten iron; and heating the nickel-containing minerals and the molten iron to 1400-1600 DEG C for smelting. The process provided by the invention fully optimizes a conventional nickel-containing steel production process, saves the smelting and production process of nickel-iron and metallic nickel, ensures nickel yield by using nickel ore to replace nickel-iron alloy and metallic nickel while significantly reducing the cost of production, improves the production efficiency, reduces economic investment, saves a great amount of raw materials, and is suitable for popularization and application in the fields of nickel-containing steel smelting.

Description

Technical field [0001] The invention relates to an alloy steel smelting method, in particular to a nickel-containing steel production process. Background technique [0002] At present, metal nickel is generally valued in steel smelting production, especially the production of stainless steel and high-grade alloy steel. The smelting process is mainly carried out in steelmaking (iron ore → sintering → blast furnace ironmaking → molten iron desulfurization → converter (or electric furnace) )→Add alloy→Fine-adjust composition in LF furnace or RH or other refining equipment→Continuous casting→Rolling→Finished steel) to add alloy to the converter or electric furnace stage, that is, to add metallic nickel or nickel-iron alloy to the converter or electric furnace to achieve The required components of steel grades consume a lot of metallic nickel or nickel-iron alloys in this process, and some nickel-containing steel production processes directly adopt the method of adding electrolytic ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/52
CPCY02P10/20
Inventor 崔东瑞
Owner 河北节能耐火材料集团有限公司
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