Tungsten iron production process

Caking method

The agglomeration method uses an open electric furnace that can move on the track and the upper part of the furnace body is detachable, and carbon is used as a reducing agent. Fine tungsten ore, pitch coke (or petroleum coke) and slagging agents mixed charges (aluminum alumina) consisting successively added portionwise furnace in metal refining is generally obtained as a viscous, with the increase of the thickness, the lower portion Gradually solidified. After the furnace is full, the furnace is shut down, the furnace body is pulled out, and the upper furnace body is removed to condense the agglomerates. The clot is then removed for crushing and finishing; the edges, the slag and the unqualified portion are re-melted. The product contains about 80% tungsten and contains no more than 1% carbon.

Take iron

The iron extraction method is suitable for smelting tungsten iron with a low melting point of 70% tungsten. The use of silicon and carbon as a reducing agent; sub-reduction (also known as slag depletion), refining, iron taking three stages of operation. In the reduction stage, the furnace contains slag containing more than 10% of WO3 left after the previous furnace is taken, and then successively adds a batch of tungsten concentrate charge, and then adds 75% silicon ferrosilicon and a small amount of pitch coke (or petroleum). The coke is subjected to reduction smelting, and the slag is discharged when the slag contains WO3 below 0.3%. Then it is transferred to the refining stage. During this period, tungsten concentrate and asphalt coke mixture are added in batches, and operated at a higher voltage to remove impurities such as silicon and manganese at a higher temperature. Sampling inspection, after determining the ingredients, start taking iron. In the past, steel spoons were used to manually digging iron blocks into the pool. In the early 1960s, Jilin Ferroalloy Plant switched to mechanical iron-taking devices to improve working conditions. During the iron extraction period, tungsten concentrate and asphalt coke are added as appropriate according to the furnace conditions. The smelting power consumption is about 3,000 kWh/ton, and the tungsten recovery rate is about 99%.

Aluminothermic method

In recent years, in order to utilize the waste cemented carbide powder tungsten- cobalt to separate the regenerated tungsten carbide after cobalt extraction, an aluminothermic ferro-tungsten process has been developed, using regenerated tungsten carbide and iron as raw materials, and aluminum as a reducing agent in tungsten carbide. The heat energy of its own carbon and aluminum combustion converts tungsten and iron in the raw material into tungsten iron, which saves a lot of electricity and reduces costs. At the same time, because the impurities in the raw material tungsten carbide are far lower than the impurities of the tungsten concentrate, the product quality is higher than that of tungsten ore with tungsten concentrate as raw material. The recovery rate of tungsten is also higher than that of tungsten concentrate.

Tungsten is expensive, and it is necessary to pay attention to improving the recovery rate in the production process. Unqualified products and slag iron should be collected and returned to the furnace. The electric furnace should have high-efficiency furnace gas dedusting facilities and recover tungsten dust.

Frost Heater

The MIni frost heater warm the room as it passes over a heated coil, The heated air rises naturally or is forced out by air preads into the space to warm room.