How to Use Scheelite to Obtain Ferrotungsten

Ferrotungsten is an iron alloy series (containing tungsten, 70%-80%), an alloy of tungsten and iron. It is used as an alloy additive for steelmaking. The commonly used tungsten iron contains 70% and 80% tungsten types. With the depletion of wolframite resources, how to make full use of scheelite resources that occupy the majority of reserves has become particularly important.

In domestic enterprises, iron ore is produced by iron extraction with scheelite, tungsten waste and iron ore as raw materials, including furnace batch, preheating of electric furnace, feeding refining, tungsten iron, slag discharge, and recycling process. Its characteristic is to mix scheelite into "artificial wolframite" for smelting. The 70-80% (weight) wolfram and 20-30% tungsten waste and iron ore are mixed into tungsten raw materials containing WO₃ 50-66% and Fe_O 10-18% in the batch. The input of tungsten raw materials in the feeding refining is 30-50% of the tungsten raw material, which should be added to the production cycle. The slag surface in the furnace remains 30-60cm to the tungsten iron alloy layer, and the refining temperature is 3000-5500°C, the refining time is 120-150 minutes, and the 50-70% of the tungsten raw material should be added to the furnace between the process of digging the tungsten iron and the slags.

This method, based on the useful elements of wolframite concentrate, can be smelted by mixing wolframite and tungsten containing waste with iron ore, mixed with iron ore and iron ore, and blending into "artificial wolframite". The recovery rate of tungsten is above 96.5%, not less than traditional technology, and the production is easy to master, and not only can be widely used in tungsten resources, but also remarkable. In order to reduce the cost of mineral processing and production, before refining and extracting tungsten and iron, a part of the tungsten material is put into the production cycle to control the depth of the slag surface so that the electrode arc is close to the tungsten alloy layer, which can shorten the refining time and reduce the consumption of electricity. At the same time, the calcium phosphate in the scheelite and the phosphorus in the tungsten material is used to make the most of the calcium phosphate. The refractory phosphorus impurities are discharged with slag in the form of calcium phosphate in liquid form.

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