D. I. Balakhonov, I. A. Makarov.
ABSTRACT
This paper presents the results of research on plasma-chemical tungsten carbides synthesis from multicomponent oxide-containing concentrates. Under this research we analyze the existing technologies of high-temperature concentrated energy flows exposure to mineral raw materials. The procedures of extractive metallurgy in mineral ores processing have been investigated. In our research we have considered the experimental dependences of tungsten carbides synthesis on the following factors: the plasma flow temperature Tp, the exposure time τ, the mixture fraction size, the mechanical activation degree, the amount of graphite added and the concentrate types. We have carried out the comparative analysis of the tungsten carbides production from scheelite concentrate and calcium tungstate on proportion of the contained tungsten trioxide WO3 under the same synthesis conditions. The results of spectral and scanning electron microscopy of products of plasma-chemical synthesis and nanocrystalline tungsten carbide powder have been examined. The perspective of the method of plasma-chemical tungsten carbides synthesis from multicomponent oxide-containing concentrates has been regarded.
KEYWORDS: scheelite concentrate, calcium tungstate, high-density energy, plasma, tungsten, tungsten carbide, plasma chemical synthesis
DOI:10.31857/S0235010620020024