In this paper, the effect of alkaline fusion associated with acid leaching for the purification process of tantalum-niobium ore (Fe,Mn)(Ta1_−xNb_x)₂O₆ was investigated. The milled, screened, and sieved ore was melted upon the use of alkaline fluxing agents: potassium pyrosulfate, an equimolar mixture of potassium pyrosulfate and potassium bisulfite, and potassium bisulfate. The fused and crushed samples were subject to hot HCl leaching under several experimental conditions. The retrieved solid was then washed with DI water and dried so that XRF analysis could be performed to assess the attained purification of the ore. It was found that the use of potassium bisulfate as an alkaline fluxing agent was the most efficient of the three, and that total purification (>97 %wt. of Nb and Ta) was attained after the 15th round of acid leaching with HCl producing a nanoscale mixed and amorphous Nb,Ta oxide powder as the final product.

本文研究了酸浸碱熔对钽铌矿(Fe,Mn)(Ta1 _-x Nb _x ) ₂ O ₆提纯工艺的影响被调查。在使用碱性助熔剂：焦硫酸钾、焦硫酸钾和亚硫酸氢钾的等摩尔混合物以及硫酸氢钾时，研磨、筛选和筛分的矿石被熔化。熔融和压碎的样品在几种实验条件下进行热 HCl 浸出。然后将回收的固体用去离子水洗涤并干燥，以便可以进行 XRF 分析以评估矿石的纯度。发现使用硫酸氢钾作为碱性助熔剂是三者中最有效的，并且在第 15 轮 HCl 酸浸后达到总净化（>97%wt. Nb 和 Ta），产生纳米级混合和无定形 Nb、Ta 氧化物粉末作为最终产品。