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Aluminothermy self-propagating gradient reduction and slag-washing and refining-based method for preparing ferrotungsten

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

Active Publication Date: 2017-08-29
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • 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

[0027] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0028] (1) Thermite self-propagating gradient reduction

[0029] 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 of 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 ...

Embodiment 2

[0035] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0036] (1) Thermite self-propagating gradient reduction

[0037] According to WO 3 , Fe 2 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

[0043] A method for preparing tungsten-iron alloy based on thermite self-propagating gradient reduction and slag washing refining, comprising the following steps:

[0044] (1) Thermite self-propagating gradient reduction

[0045] 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

The invention provides an aluminothermy self-propagating gradient reduction and slag-washing and refining-based method for preparing ferrotungsten. The method comprises: (1) aluminothermy self-propagating gradient reduction: first manner, dividing raw materials into a plurality of batches, putting the first batch of materials into a reaction furnace, igniting the materials from the top with magnesium powder to trigger a self-propagating reaction, and adding other batches of materials in succession till the reaction is complete; second manner, uniformly mixing the raw materials expect for aluminum powder, adding into a continuous blender mixer at a uniform flow rate, meanwhile adding the aluminum powder into the continuous blender mixer at a flow rate with a progressively decreased gradient, and simultaneously introducing the uniformly mixed raw materials into the reaction furnace for aluminothermy self-propagating reaction till all materials are totally reacted; (2) performing heat preservation and melting to obtain upper layer aluminum oxide base molten slag and lower alloy melt; (3) jetting refined slag in the lower alloy melt for stirring, slag-wash and refining; and (4) cooling the refined high temperature melt to room temperature to remove the upper layer molten slag to obtain the ferrotungsten.

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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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
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