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

Abstract

The invention provides a method for preparing tungsten ferroalloy based on thermite self-propagating gradient reduction and slag washing refining, which includes: (1) Thermite self-propagating gradient reduction: the first method is to divide the raw materials into several batches, and divide the first batch into The material is put into the reactor, and magnesium powder is ignited from the top of the material to trigger a self-propagating reaction. Other batches of materials are added one after another until the reaction is complete. In the second method, the raw materials except aluminum powder are mixed evenly and added to the reactor at a uniform flow rate. In the continuous mixer, aluminum powder is added to the continuous mixer at a gradient decreasing flow rate at the same time, and the mixed raw materials are continuously introduced into the reactor to perform the aluminothermic self-propagation reaction until all materials are completely reacted; (2) Insulation smelting Obtain the upper layer of alumina-based slag and the lower layer of alloy melt; (3) Inject the refining slag into the lower layer of alloy melt to stir and wash the slag for refining; (4) Cool the refined high-temperature melt to room temperature and remove the upper layer of smelting slag. Finally, tungsten ferroalloy is obtained.

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...

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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