A kind of tungsten-molybdenum-iron alloy and preparation method thereof

Abstract

The invention relates to the technical field of mineral extraction metallurgy, in particular to a tungsten-molybdenum-iron alloy and a preparation method for the same. The tungsten-molybdenum-iron alloy consists of the following main elements by weight: 10 to 30 percent of W, 1 to 10 percent of Mo and the balance of iron. The tungsten-molybdenum-iron alloy also contains tungsten and molybdenum, and is low in melting point, and when the tungsten-molybdenum-iron alloy is used as a steelmaking additive for tungsten-molybdenum alloy steel, the performance of the alloy steel can be effectively improved, and the steelmaking production cost can be lowered; the preparation method for the tungsten-molybdenum-iron alloy is used for preparing the tungsten-molybdenum-iron alloy from low-grade tungsten concentrate serving as a raw material by dehydration, mixing, vacuum dephosphorization, mixing and reduction smelting, so that the flow of the preparation method is simple, the preparation method is convenient to operate, and green production is realized; the raw material low-grade tungsten concentrate is low in cost and readily available, and a valuable element phosphorus is recovered while the tungsten-molybdenum-iron alloy is prepared, so that multiple resources are comprehensively recovered, and the economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of mineral extraction metallurgy, in particular to a tungsten-molybdenum-iron alloy and a preparation method thereof. The tungsten-molybdenum-iron alloy is used as a steelmaking additive. Background technique [0002] Tungsten and molybdenum are two important rare metals; as we all know, the iron and steel industry is a large user of tungsten and molybdenum. According to statistics, 40% of tungsten and 80% of molybdenum are used in the iron and steel industry. Tungsten and molybdenum are important elements in alloy steel, especially high-speed steel, tool and die steel, stainless steel, heat-resistant steel, magnetic steel, corrosion-resistant alloys and high-temperature alloys. Among them, tungsten is an element that can generate carbides. Adding it to steel can improve the toughness of steel. Tungsten carbide has finer particles and higher hardness, thus greatly improving the hardness and wear resistance o...

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Problems solved by technology

[0013] The above studies have shown that it is practical to prepare tungsten-molybdenum-iron alloys from tungsten concentrates; 3 More than 60%, the worst tungsten raw material, WO 3 57%, while MoO in its molybdenum source 3 At 60~70%, MoO is the best molybdenum raw material 3 72.75%, it directly uses molybdenum oxide as the source of molybdenum in the alloy, and in actual industrial production, these limited high-grade tungsten or molybdenum resources are mainly used to prepare pure tungsten compounds (such as ammonium paratungstate, tungsten trioxide and metal tungsten powder or tungsten bar) or pure molybdenum compounds (such as ammonium molybdate, molybdenum trioxide or metal molybdenum powder or molybdenum bar), and, when the tungsten-molybdenum-iron alloys prepared above are used as tungsten-molybdenum additives to smelt special steel, due to alloy additives The content of tungsten or molybdenum is relatively high, or because the melting point of the alloy is above 1500 °C or even 1800 °C, it is not easy to melt, and still has not overcome the disadvantages of long smelting time and serious segregation of W in steel when adding ferro-tungsten to steelmaking, or because tungsten The proportion of molybdenum element varies greatly, which does not conform to the proportion relationship of tungsten and molybdenum in alloy steel, and additional tungsten or molybdenum must be added to adjust the proportion; therefore, the above-mentioned research techniques focused on the preparation of tungsten-molybdenum-iron alloys from 1996 to 2003 were developed from It's been at least ten years now and still at the laboratory level

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