【摘要】 开发无氟工艺提高钽的浸出率对环境保护具有重要意义。通过X射线荧光光谱仪结合X射线衍射仪分析了铌钽矿的物相组成及含量，利用扫描电子显微镜结合能谱仪分析了铌钽矿硫酸浸出前后的矿相形貌及组成变化。研究了铌钽矿在浓硫酸中的溶解机制以及硫酸浸出参数如酸矿质量比、浸出温度、硫酸浓度、浸出时间、矿物粒度对Ta的浸出率的影响，从而得到最佳的反应条件。结果表明：在矿物粒度为25μm、硫酸浓度为10 mol/L、酸矿质量比为2.5∶1、浸出温度为300℃、浸出时间为4 h的条件下，Ta的浸出率可达89%。更多还原

【Abstract】 Development of fluorine-free process to improve leaching rate of tantalum is of great significance to environmental protection. The phase composition and content of the niobium-tantalum ore were analyzed by X-ray fluorescence spectrometer combined with X-ray diffractometer, and the changes in morphology and composition of the niobium-tantalum ore before and after sulfuric acid leaching were analyzed by scanning electron microscope and energy spectrometer. The dissolution mechanism of the niobium-tantalum ore in concentrated sulfuric acid and the effects of parameters of sulfuric acid leaching such as mass ratio of acid to ore, leaching temperature, sulfuric acid concentration, leaching time and mineral particle size on the leaching rate of tantalum were studied, so as to obtain the best reaction conditions. The results showed that under the conditions of mineral particle size of 25 μm, sulfuric acid concentration of 10 mol/L, mass ratio of acid to ore of 2.5-to-1, leaching temperature of 300 ℃ and leaching time of 4 h, the leaching rate of tantalum could reach 89%.更多还原