Abstract
Features of cassiterite concentrate carbothermic reduction in melt of the salt system Na2CO3–NaNO3 (1:0.3) are studied. It is shown that cassiterite (SnO2) in molten salt (900–950°C) is converted into the form of metastannate (Na2SnO3) and is reduced to metal, mainly by CO gas, with a high rate and completeness (97 wt.%). Conditions are considered for preparing tungsten powder by aluminothermic reduction of scheelite concentrate in molten salts of alkali metals (NaCl–Na2CO3, NaCl–Na2CO3–NaF, NaCl–Na2CO3–Na3AlF6). It is established that powder yield is ~ 94%, and tungsten purity is 97%. It is shown that powder specific surface reaches 12.96·105 m−1.
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