Tungsten Oxide

Electrical selection method is an important auxiliary way of ore processing, when tungsten ores  are under electrical selection, tungsten ores and cassiterite need to be separated.  With high voltage electrical selection machine, wolframite and scheelite can successfully separated,  sulfide ores and wolframite can successfully separated as well. Because wolframite and sulfide ores are with conductivity, scheelite and tin ores are not with conductivity.  The effect of electrical selection method is not only determined by the conductivity of tungsten, also by three major factors: temperature, structure, and surface states.  1. Temperature: For conductors, the conductivity decreases when temperature increases. For semiconductors like tungsten ores, as the temperature goes high, the bound charge is released by the heat energy, the free electron increases and the conductivity incr...