The technological parameters and the mechanism of low-acid pulp extraction of tantalum were investigated. The results show that hydrofluoric acid concentration, sulfuric acid concentration, organic to pulp phase ratio, the concentration of tantalum and niobium, contact time and temperature have a significant effect; optimum process operating parameters were established as follows: hydrofluoric acid concentration 1.6 mol/L, sulfuric acid concentration 0.6 mol/L, organic to pulp phase ratio 3:1, tantalum concentration 26.61 g/L, niobium concentration 11.64 g/L, contact time 5min and room temperature. Under these experimental conditions, tantalum extraction can reach more than 98% and the separation factors of Ta/Nb, Ta/Fe and Ta/Sn were maximal. According to slope analysis, the equimolar series method and the saturation capacity method, the extraction product was identified as 3MIBK?H_2TaF _7.
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机译：研究了钽的低酸浆提取工艺参数及机理。结果表明，氢氟酸浓度，硫酸浓度，有机浆比，钽铌浓度，接触时间和温度均具有显着影响。确定最佳工艺操作参数如下：氢氟酸浓度1.6 mol / L，硫酸浓度0.6 mol / L，有机物与纸浆的比为3：1，钽浓度为26.61 g / L，铌浓度为11.64 g / L，接触时间在室温下放置5分钟。在这些实验条件下，钽的萃取率可达98％以上，Ta / Nb，Ta / Fe和Ta / Sn的分离系数最大。根据斜率分析，等摩尔级数法和饱和容量法，提取产物鉴定为3MIBK·H_2TaF_7。
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