Method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining

A self-propagating technology of ferrotungsten alloy, applied in the field of preparation of ferrotungsten alloy, can solve the problems of limited source of raw materials, low recovery rate of alloying elements, unsuitable for large-scale production, etc. stable effect

Active Publication Date: 2018-08-28
NORTHEASTERN UNIV LIAONING
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  • Application Information

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Problems solved by technology

However, this method is limited by the source of raw materials and is not suitable for large-scale production
[0003] Based on the disadvantages of low recovery rate of alloy elements, high energy consumption, and limited raw material sources in the current preparation process of tungsten-iron alloy, the present invention proposes a new method for preparing tungsten-iron alloy based on thermite self-propagating gradient feeding reduction combined with slag washing and refining

Method used

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Effect test

Embodiment 1

[0026] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0027] (1) Thermite self-propagating gradient reduction

[0028] According to WO 3 , Fe 2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:0.28:0.33:0.07, and their particle sizes respectively satisfy: WO 3 Particle size≤2mm, Fe 2 o 3 Powder particle size ≤ 0.2mm, aluminum powder particle size ≤ 2mm, slagging agent particle size ≤ 0.2mm; the material is divided into 5 batches, and the amount of aluminum in each batch is 1.20, 1.05, 1.0, 0.90, 0.85 times, and the total aluminum content of raw materials is 0.98 times the theoretical chemical dosage ratio of thermite self-propagating reaction, the weight of the first batch of materials accounts for 20% of the total material amount; put the first batch of materials into the reaction furnace, and Magnesium powder is ignited from the top...

Embodiment 2

[0034] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0035] (1) Thermite self-propagating gradient reduction

[0036] According to WO 3 , Fe2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:0.29:0.34:0.15, and their particle sizes respectively satisfy: WO 3 Particle size≤2mm, Fe 2 o 3 Powder particle size ≤ 0.2mm, aluminum powder particle size ≤ 2mm, slagging agent particle size ≤ 0.2mm; the material is divided into 6 batches, and the amount of aluminum in each batch is 1.20, 1.1, 0.95, 1.20, 1.1, 0.95, 0.90, 0.85, 0.80 times, and the total aluminum content of raw materials is 0.97 times of the theoretical chemical dosage ratio of thermite self-propagating reaction, and the weight of the first batch of materials accounts for 28.6% of the total amount of materials; put the first batch of materials into the reaction furnace , use magne...

Embodiment 3

[0042] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0043] (1) Thermite self-propagating gradient reduction

[0044] According to WO 3 , Fe 2 o 3 The mass ratio of powder, aluminum powder, and slagging agent CaO is 1.0:0.32:0.34:0.35, and their particle sizes respectively satisfy: WO 3 Particle size≤2mm, Fe 2 o 3 Powder particle size ≤ 0.2mm, aluminum powder particle size ≤ 2mm, slagging agent particle size ≤ 0.2mm; the material is divided into 7 batches, and the amount of aluminum in each batch is 1.20, 1.1, 1.0, 0.95, 0.925, 0.90, 0.85 times, and the total aluminum content of raw materials is 0.95 times of the theoretical chemical dosage ratio of thermite self-propagating reaction, and the weight of the first batch of materials accounts for 22.2% of the total amount of materials; put the first batch of materials into the reaction In the furnace, magnesium po...

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Abstract

Provided in the present invention is an aluminum thermal self-propagation gradient reduction and slag washing and refining-based method for preparing a tungsten-iron alloy, comprising: (1) aluminum thermal self-propagation gradient reduction: a first manner comprising raw materials being divided into several batches, and a first batch of materials being placed into a reaction furnace, magnesium powder then being ignited from a top portion of the materials so as to initiate a self-propagation reaction, while the other batches of materials are added sequentially until the reaction is complete; the second manner comprising raw materials other than aluminum powder being uniformly mixed and added into a continuous mixer at a uniform flow rate, while the aluminum powder is added into the continuous mixer at a graded decreasing flow rate, the mixed raw materials then being continuously introduced into a reaction furnace to carry out an aluminum thermal self-propagation reaction until all of the materials have reacted completely; (2) thermal insulation smelting to obtain an upper layer of aluminum oxide-based slag and a lower layer of an alloy melt; (3) injecting refining slag into the lower layer of the alloy melt to carry out stirring slag washing and refining; (4) cooling the refined high-temperature melt to room temperature, and removing an upper layer of smelting slag so as to obtain a tungsten-iron alloy.

Description

technical field [0001] The invention relates to a method for preparing tungsten-iron alloy, in particular to a method for preparing tungsten-iron alloy based on aluminothermic self-propagating gradient reduction and slag washing and refining. Background technique [0002] Ferro-tungsten is one of the important iron alloys in the iron and steel industry. Tungsten is the main element of alloy tool steel, which can significantly improve the wear resistance and machinability of steel. In addition to forming carbides in steel, tungsten partially dissolves into iron to form a solid solution. Tungsten in steel can increase tempering stability, red hardness, hot strength and increased wear resistance due to the formation of carbides. It is mainly used in the smelting of tool steel, such as high-speed steel and steel for hot forging dies. At present, the smelting methods of ferrotungsten are mainly agglomeration method, iron extraction method and aluminothermic method. The agglome...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/02C22C35/00
CPCC22C1/02C22C27/04C22C35/00C21B15/02C22C33/04
Inventor 豆志河张廷安刘燕程楚吕国志潘喜娟赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV LIAONING
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