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A kind of nickel-iron alloy and preparation method thereof

A technology of nickel-iron alloy and iron alloy, which is applied in the field of nickel-iron alloy and its preparation, can solve the problems of expensive coke, complex production process, and low production efficiency, and achieve significant energy saving and emission reduction, high density and purity, and high production efficiency.

Inactive Publication Date: 2017-01-25
湖南中伟控股集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional method of producing nickel-iron alloy from nickel oxide ore containing 1.5-2.5% nickel in China is mainly to use nickel ore for sintering, use lime as solvent, and use coke as reducing agent to perform selective reduction in submerged heat electric furnace to obtain nickel Ferroalloy products are used for the production of stainless steel. The traditional production process is relatively complicated, the production efficiency is low, the coke consumption in the sintering process is high, the lime is easy to pulverize in the production process, the coke is expensive, the cost is high, and the pollution is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A nickel-iron alloy whose composition is composed of Ni 38-50%, C 0.8-1.5%, Si 0.5-1.5%, P 0.03-0.10%, S 0.01-0.05%, Cr 1-2.5% , Co 0.5-1.0%, the balance is iron. The surface uniformity of the nickel-iron alloy is less than 5%, and the surface brightness is first-class brightness.

[0020] The method for preparing the nickel-iron alloy includes the following steps:

[0021] (1) Mixing and ball pressing: crush the nickel oxide ore to a particle size of less than 10mm, and then add 5-10% coal powder, 0.8-1.5% binder, 3-5% lime powder, 0.5% by weight. -1.0% water cobalt sulfate is mixed and pressed into pellets to control the moisture of the pellets at 8%; the adhesive is water glass.

[0022] (2) Reduction: send the prepared pellets into a rotary hearth furnace for reduction to obtain metallized pellets, the reduction temperature is 1300°C, and the reduction time is 3 hours;

[0023] (3) Melting: The metallized pellets are first solid-phase sintered at 1000°C for 6 hours, and t...

Embodiment 2

[0026] A nickel-iron alloy whose composition is composed of Ni 38-50%, C 0.8-1.5%, Si 0.5-1.5%, P 0.03-0.10%, S 0.01-0.05%, Cr 1-2.5% , Co 0.5-1.0%, the balance is iron.

[0027] The method for preparing the nickel-iron alloy includes the following steps:

[0028] (1) Mixing and ball pressing: crush the nickel oxide ore to a particle size of less than 10mm, and then add 5-10% coal powder, 0.8-1.5% binder, 3-5% lime powder, 0.5% by weight. -1.0% water cobalt sulfate is mixed and pressed into pellets, the moisture content of the pellets is controlled at 10%; the adhesive is PVA.

[0029] (2) Reduction: send the prepared pellets into a rotary hearth furnace for reduction to obtain metallized pellets, the reduction temperature is 1500°C, and the reduction time is 1 hour;

[0030] (3) Melting: The metallized pellets are first solid-phase sintered at a temperature of 1350°C for 4 hours, and then heated to 1750°C for 1 hour to obtain a crude nickel-iron alloy;

[0031] (4) Refining: The crud...

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PUM

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Abstract

The invention discloses a ferro-nickel alloy and a preparation method thereof. The ferro-nickel alloy comprises the following components in percentage by weight: 38-50% of Ni, 0.8-1.5% of C, 0.5-1.5% of Si, 0.03-0.10% of P, 0.01-0.05% of S, 1-2.5% of Cr, 0.5-1.0% of Co and the balance of Fe. The preparation method comprises the steps of (1) mixing and pelleting; (2) reducing; (3) smelting, namely firstly carrying out solid phase sintering on the a metalized pellet at the temperature of 1000-1350 DEG C for 4-6 days, further heating to 1500-1750 DEG C, and smelting for 1-3 hours to obtain crude ferro-nickel alloy; and (4) refining, namely refining the crude ferro-nickel alloy, adding basic oxide accounting for 2.5-3.5% of the weight of the crude ferro-nickel alloy while refining to obtain refined molten ferro-nickel, and then, pouring to obtain a refined ferro-nickel alloy product, wherein the refining temperature is 1500-1700 DEG C, the refining period is 30-50 minutes, and the oxygen blowing quantity is 100-200Nm<3> / t. The ferro-nickel alloy and the preparation method thereof have the advantages that the prepared ferro-nickel alloy is high in density and purity and good in strength, toughness and wear resistance; and the preparation method is simple, low in production cost and remarkable in energy-saving and emission-reduction effects.

Description

Technical field [0001] The invention relates to the technical field of ferroalloys, in particular to a nickel-iron alloy and a preparation method thereof. Background technique [0002] Ferroalloy, in a broad sense, refers to a product that is added to the molten iron as a deoxidizer, elemental additive, etc. to make the steel possess certain characteristics or meet certain requirements during steelmaking. An intermediate alloy composed of iron and one or more elements, mainly Used in steel smelting. Nickel can be fused with iron to form a nickel-iron alloy to form a high-strength light alloy, which is widely used in various aspects. At present, the traditional domestic method for producing nickel-iron alloys from nickel oxide ore containing 1.5-2.5% nickel is mainly to use nickel ore for sintering, lime as solvent, and coke as reducing agent to produce nickel by selective reduction in an electric furnace. Ferroalloy products are used for the production of stainless steel. The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C38/52C22C38/60C22C33/04C22C1/02C22B1/242
Inventor 梅百荣
Owner 湖南中伟控股集团有限公司