Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

N. I. Kopylov, Leading Researcher, e-mail: kopylov_ni@gorobok.net
S. S. Shatskaya, Senior Researcher

Skimmings Tin production depending on the type of raw materials may contain not only residual impurities Tin, but also high concentrations of other metals, such as tungsten. When it reaches extremely high concentrations in the ash, the latter may be used as secondary raw materials. So, according to the content of tungsten slag recycling Tin raw materials containing tungsten, can be more than 12%. With more than half of the total number of tungsten is in the form of scheelite (CaWO₄) and the rest is part of the aluminosilicate glass. To extract tungsten from the slag in the production of Tin were offered technology used in processing the raw material tungsten of the first stage: sintering or melting with soda, followed by leaching and a number of other ways including autoclave technology and leaching of nitric acid. They all have a number of disadvantages, the most important of which are: the inability to reach optimal regimes of complex. In this study for extraction of tungsten slag production of Tin was applied previously developed method for the decomposition of Tungsten concentrate. This approach eliminates the disadvantages of the proposed and used in the industry and is the decomposition of tungsten concentrate is carried out at low temperature in the fusible melt-of Na₂CO₃ – NaNO₃. The way is simple technological scheme and using standard equipment. In the present work experiences have shown the ability to extract tungsten in aqueous solution from slag containing tungsten Tin production by low-temperature (600 ^оС) decomposition in the melt of carbonate-sodium nitrate.

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