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

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...

AI Technical Summary

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