Technique for preparing nickel-iron alloy

A nickel-iron alloy and preparation technology, 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: 2011-07-20
PANZHIHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Technique for preparing nickel-iron alloy
  • Technique for preparing nickel-iron alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In 1 ton of nickel oxide-containing raw materials (the composition is TFe 26.0%, Ni 1.88%, SiO 2 28.46%, CaO2.02%, MgO12.12%, Al 2 o 3 5.69%, P2 It is formulated for 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, the melting and separation temperature is 1650° C., and the iron slag is removed to obtain a coarse nickel-iron alloy. Crude nickel-iron alloy is sent to the AOD refining furnace to...

Embodiment 2

[0028] Add coal powder 50kg, binder PVA 31.5kg and fluorite in 1 ton of nickel oxide-containing raw material (ingredients are the same as in Example 1), and the amount of fluorite is according to the alkalinity of the mixture CaO / SiO 2 Prepared for 0.9, coal powder, fluorite particle size 3 / t. The test results of product components are: Ni 17.8%, C 0.022%, S<0.03%, P<0.03%, and the balance is iron. The obtained nickel-iron alloy conforms to the ISO6501:1998 (E) standard grade requirement. In this embodiment, the reduction energy consumption of the rotary kiln is low, and there is less dust after reduction, and the furnace lining does not stick to the pellet charge.

Embodiment 3

[0030] In 1 ton of nickel oxide-containing raw materials (the composition is TFe 24.0%, Ni 1.98%, SiO 2 25.6%, CaO2.22%, MgO14.12%, Al 2 o 3 4.9%, P2 Prepared for 1.2, the particle size of coal powder and flux is 3 / t. The test results of product components are: Ni 18.1%, C 0.028%, S<0.025%, P<0.028%, and the balance is iron. The obtained nickel-iron alloy conforms to the ISO6501:1998 (E) standard grade requirement. In this embodiment, the reduction time of the rotary hearth furnace is short and the energy consumption is low. In addition, after the reduction of the rotary hearth furnace, there is less dust at the bottom of the furnace, and the furnace lining does not stick to the pellet charge.

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Abstract

The invention belongs to the field of metallurgical technology, and more particularly relates to a technique for preparing nickel-iron alloy. The technique aims at solving the technical problem of providing the technique which is used for preparing nickel-iron alloy, has high production efficiency, short process flow and low energy consumption, takes common coal as reducing agent and ensures burden not to be easily agglomerated. The technical scheme comprises the steps: A. after mixing nickel oxide-containing raw material, pulverized coal and fusing agent, pelletizing the mixture; B. reducingpellets and obtaining metalized pellets; C. smelting the metalized pellets and obtaining crude nickel-iron alloy; D refining the nickel-iron alloy and obtaining refined nickel-iron alloy. The technique has the raw material which is internally provided with pulverized coal pellets, enlarges the reaction area, improves the dynamical condition and is beneficial to the reduction process. Furthermore,the technique has the advantages of short reduction time, low energy consumption, less dust and high recovery rate of useful elements as well as ensuring the pellet burden not to bond a furnace lining.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation process of 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C33/04C22B4/06C22B1/24C21C7/068
Inventor 杨绍利汪玉涛陈厚生丁光斌高仕忠马兰
Owner PANZHIHUA UNIV
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