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Manufacture method of nickel-iron alloy

A technology of nickel-iron alloy and manufacturing method, which is applied in the field of metallurgy, can solve the problems of long reduction time, high energy consumption, and low production efficiency, and achieve the effects of short reduction time, low energy consumption, and less dust

Inactive Publication Date: 2017-06-09
侯霞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blast furnace reduction and shaft furnace reduction-electric furnace smelting-refining method to reduce nickel oxide ore has problems such as long reduction time, low production efficiency, scarce coke as fuel, and the need for sinter (or oxidized pellets). Direct electric furnace The smelting-refining method still has problems such as high energy consumption and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In 1 ton of nickel oxide-containing raw material (composition is TFe 26.0% by weight percentage, Ni 1.88%, SiO2

[0026] 28.46%, CaO2.02%, MgO 12.12%, Al2O3 5.69%, P<0.005%, S 0.094%, and the rest is water), add 30kg of coal powder, binder PVA 2.06kg and limestone, the amount of limestone is according to the mixture alkali The degree of CaO / SiO2 is 0.6, and the particle size of coal powder and limestone is less than 5mm. The aforementioned 4 kinds of raw materials are mixed with water to form a mixture so that the water content is 7.8% of the weight of the mixture, and after uniform stirring, the pellets are pressed into pellets with a diameter of 30mm by a pressure molding machine. The pellets are sent into a rotary hearth furnace for reduction, the temperature of the rotary hearth furnace is controlled at 1300-1350° C., and the reduction time is 40 minutes to obtain metallized pellets. Then an electric arc furnace is used to melt and separate the metallized pellets, ...

Embodiment 2

[0029] Add coal powder 50kg, binding agent PVA 31.5kg and fluorite in 1 ton of nickel oxide-containing raw materials (ingredients are the same as in Example 1), the fluorite consumption is according to the basicity of the mixture CaO / SiO It is 0.9 preparation, coal powder, fluorite Particle size <5mm. The aforementioned 4 kinds of raw materials are mixed with water to make a mixture so that the water content is 7.2% of the weight of the mixture, and after uniform stirring, the pellets with a diameter of 30mm are pressed by a pressure molding machine. The pellets are sent to a rotary kiln for reduction, the temperature of the rotary kiln is controlled at 1100-1200°C, and the reduction time is 240 minutes to obtain metallized pellets. Then use a submerged arc furnace to melt and separate and deeply reduce the metallized pellets. The melting and separation temperature is 1550 ° C, and the iron slag is removed to obtain a coarse nickel-iron alloy. Crude nickel-iron alloy is sent ...

Embodiment 3

[0031] In 1 ton of nickel oxide-containing raw material (composition is TFe 24.0% by weight percentage, Ni 1.98%, SiO2

[0032] 25.6%, CaO2.22%, MgO 14.12%, Al2O3 4.9%, P<0.006%, S 0.088%, and the rest are water), add coal powder 100kg, PVA 8.8kg and limestone, the amount of limestone is according to the alkalinity of the mixture CaO / SiO2 is prepared at 1.2, and the particle size of coal powder and flux is <5mm. The aforementioned 4 kinds of raw materials are mixed with water to form a mixture so that the water content is 7.1% of the weight of the mixture, and after being stirred evenly, pressure molding is used to form pellets with a diameter of 40 mm. The pellets are sent into a rotary hearth furnace for reduction, the temperature of the rotary hearth furnace is controlled at 1300-1350° C., and the reduction time is 35 minutes to obtain metallized pellets. Then use an electric arc furnace to melt and separate and deeply reduce the metallized pellets. The melting and separa...

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Abstract

The invention belongs to the technical field of metallurgy, in particular to a method for manufacturing a nickel-iron alloy. The technical problem to be solved by the present invention is to provide a nickel-iron alloy manufacturing method with high production efficiency, short process, low energy consumption, common coal as reducing agent, and furnace charge that is not easy to agglomerate. The technical scheme of the present invention comprises the following steps: A. After mixing nickel oxide-containing raw materials, coal powder and flux, press them into pellets; B. Reducing the pellets to obtain metallized pellets; C. Smelting the metallized pellets to obtain rough nickel-iron alloy ; D, crude nickel-iron alloy is refined to obtain refined nickel-iron alloy. The present invention mixes coal powder in the raw material to form pellets, which increases the reaction area, improves the kinetic conditions, and facilitates the reduction process. The reduction time is short, the energy consumption is low; and the pellet furnace charge does not stick to the furnace lining, the dust is less, and the recovery rate of useful elements is high.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for manufacturing a nickel-iron alloy. Background technique [0002] The traditional nickel-iron alloy production method is to use pyrometallurgy to smelt nickel oxide ore. According to different reduction processes, it can be divided into: blast furnace reduction and shaft furnace reduction-electric furnace smelting-refining method, direct electric furnace smelting-refining method, and patents CN1306049C and CN1300352C also propose The blast furnace method, etc. However, the blast furnace reduction and shaft furnace reduction-electric furnace smelting-refining method to reduce nickel oxide ore has problems such as long reduction time, low production efficiency, scarce coke as fuel, and the need for sinter (or oxidized pellets). Direct electric furnace The smelting-refining method also has problems such as high energy consumption and low production efficiency. Cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/08C22B1/245C22B1/216C22C1/02C22C19/03
CPCC22C33/04C22B1/216C22B1/245C22C1/023C22C38/08
Inventor 侯霞
Owner 侯霞
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