China Nonferrous Metallurgy

Ferroniobium was prepared through aluminothermal reduction smelting with niobium concentrate as the raw material, and impurity elements in ferroniobium, including silicon, phosphorus and titanium, were determined simultaneously with samples for alkali fusion through ICP-AES. Moreover, the selection of instrument parameters and spectral lines of the determined elements was discussed. The determination results were compared with those obtained by wet-chemical method under the selected determination conditions. The elements in samples were determined repeatedly. The detection limit, accuracy and standard recovery rate of this method were examined. In addition, the relative standard deviation of this method was less than 2%, and the recovery rate was 98%-100%. Appropriate sample pretreatment methods and instrumental analysis conditions are adopted for this method, realizing the efficient, rapid and accurate determination of silicon, phosphorus and titanium in ferroniobium.