难处理钽铌矿的低碱钠化-还原焙烧新工艺的热力学分析  

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

作　　者：朱媛媛 江燕 ZHU Yuan-yuan;JIANG Yan(Jiujiang Nonferrous Metals Smelting Co.,Ltd.,Jiujiang 332014,China;Jiangxi Tungsten Holding Group Co.,Ltd.,Nanchang 330961,China)

机构地区：[1]九江有色金属冶炼有限公司,江西九江332014 [2]江西钨业控股集团有限公司,江西南昌330961

出　　处：《稀有金属与硬质合金》2025年第2期15-19,共5页Rare Metals and Cemented Carbides

摘　　要：针对高硅高铁难处理钽铌矿提出了一种新型的低碱钠化-还原焙烧工艺,并对其中的钠化剂热分解与还原反应、钽铌铝硅等钠化反应以及铁钽铌氧化物还原反应进行了热力学分析,以验证该工艺的可行性。分析结果表明,在1264~1546 K焙烧温度范围内,通过加入钠化剂和还原剂,钽铌矿中铁氧化物可还原成Fe单质通过磁选去除,Si、Al、W、Sb等杂质可大部分生成可溶性盐被水溶出留在磁选尾水中,而钽和铌不与钠化剂或还原剂发生反应,在磁选渣中得到富集。本研究为钽铌的清洁高效冶炼提供了新思路。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.

关 键 词：钽铌矿 低碱钠化 还原 焙烧 热力学分析 清洁冶炼 

分 类 号：TF841.6[冶金工程—有色金属冶金]