How Do You Make Fe-tungsten?

How to make ferrotungsten?

The agglomeration method uses an open electric furnace that can be moved on rails and the upper section of the furnace body is detachable, and carbon is used as the reducing agent. The mixed charge composed of refined tungsten ore, pitch coke (or petroleum coke) and slagging agent (bauxite) is added to the furnace in batches. The metal refined in the furnace is generally viscous. As the thickness increases, the lower part gradually solidification. When the furnace is full, stop the furnace, pull out the furnace body, and remove the upper section of the furnace body to allow the agglomerates to condense. Then the clots are taken out, crushed and finished; the edges, slag and unqualified parts are picked out and returned to the furnace for remelting. The product contains about 80% tungsten and no more than 1% carbon.

The iron extraction method is suitable for smelting FeW containing 70% tungsten with a lower melting point. Silicon and carbon are used as reducing agents; the operation is divided into three stages: reduction (also known as slag depletion), refining and iron extraction. In the reduction stage, there is slag containing more than 10% WO3 left over from the previous furnace, and then successively add batches of tungsten concentrate charge, and then add ferrosilicon containing 75% silicon and a small amount of pitch coke (or petroleum) Coke) is reduced to smelting, and the slag is discharged when the WO3 content of the slag drops below 0.3%. Then it moves to the refining stage, during which tungsten concentrate and pitch coke mixture are added in batches, operated at a higher voltage, and impurities such as silicon and manganese are removed at a higher temperature. After taking samples for inspection and confirming that the ingredients are qualified, iron extraction begins. In the past, steel ladles were used to manually dig out iron blocks and put them into the pool. In the early 1960s, Jilin Ferroalloy Factory switched to mechanical iron extraction devices, which improved working conditions. During the iron extraction period, tungsten concentrate and asphalt coke materials are appropriately added according to the furnace conditions. The smelting power consumption is about 3000 kilowatt hours/ton, and the tungsten recovery rate is about 99%.

Thermite method In order to use waste cemented carbide powder tungsten cobalt to separate regenerated tungsten carbide after cobalt extraction, the thermite iron tungsten process was developed, using regenerated tungsten carbide and iron as raw materials, using aluminum as the reducing agent, and utilizing the tungsten carbide in the The heat energy of its own carbon and aluminum combustion converts the tungsten and iron in the raw materials into Ferrotungsten Alloy, which can save a lot of electrical energy and reduce costs. At the same time, since the impurities in the raw material tungsten carbide are far lower than those in tungsten concentrate, the product quality is higher than that of Wolfram ferroalloy based on tungsten concentrate. The recovery rate of tungsten is also higher than that of processes using tungsten concentrate as raw material.

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