Thermodynamic Analysis of a Novel Low-Alkali Sodiumization-Reduction Roasting Process for Refractory Tantalum-Niobium Ores AITranslate

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Chinese Library Classification Number:TF841.6[冶金工程—有色金属冶金]

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A novel low-alkali sodiumization-reduction roasting process was proposed for refractory tantalum-niobium ores with high silicon and iron content.Thermodynamic analysis was conducted on the thermal decomposition and reduction reactions of the sodiumizing agent,the sodiumization reactions of tantalum,niobium,aluminum,and silicon,as well as the reduction reactions of iron,tantalum,and niobium oxides,to verify the feasibility of the process.The analysis results indicate that within the roasting tempe-rature range of 1264~1546 K,the addition of a sodiumizing agent and a reducing agent enables the reduction of the iron oxides in the tantalum-niobium ore to metallic Fe,which is subsequently removed by magnetic separation.Most of Si,Al,W,and Sb impurities can be converted into soluble salts,which are leached out by water and remain in the magnetic separation tailwater.In contrast,tantalum and niobium do not react with the sodiumizing agent or reducing agent and are enriched in the magnetic separation residue.This study provides a new approach for the clean and efficient smelting of tantalum and niobium.