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FeW

Ferrotungsten – it is ferroalloy containing 68-72% or 78-82% W, <7% Mo (the rest iron and impurities). Ferrotungsten high content tungsten (DM FV80 and FV75) smelting alumotermic way «block», stamps FV70 and FV65 – carbon-silicon-termich way. For silicon-thermal technology as a batch using tungsten concentrates containing minerals Ferber FeWO4, gyubnerit MnWO4, wolframite (Fe, Mn) WO4 or sheelit CaWO4; oil. coke, ferrosilicon (68-75% Si) and the shaving of carbon steel. Melting lead in the arc furnaces with capacity of 5 MW with magnesite, lining, at a cost of 3550 kWh / t derive 99% wolfram. Alumotermic melting lead «on the block» the issuance of the slag after melting throughout SUSPENSION charge in the arc furnace-type CPD-1, 5, using sheelit concentrates tungsten anhydride, primary aluminum powder, iron and shavings and scale, ground limestone, sodium nitrate. Specific power consumption 425 kWh / t derive 99% of tungsten. Ingot divide to pieces is not <0.1 mm. Ferrotungsten used primarily for doping instruments (such as high-speed steels and heat resisting steel).

Date ASIA EUROPE USA
18/04/2009 62214.37 62214.37 62214.37
28/02/2009 66138.6 66138.6 66138.6
31/01/2009 63933.98 63933.98 63933.98
31/12/2008 62831.67 62831.67 62831.67
30/10/2008 55930 55850 55832
30/06/2008 36920 36760 36700
30/05/2008 36250 36260 37101
30/04/2008 36550 36520 38525
30/03/2008 39770 39530 39527
28/02/2008 37400 37440 41612
30/01/2008 33820 33910 38581
30/12/2007 37754 37754 37754




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