【摘要】 钽是一种稀有的难熔金属，是重要的战略资源，广泛应用于国防和民用领域。钽矿品位较低、资源紧张，随着含钽二次资源的逐年增加，从中回收钽具有重要的意义。钽金属具有极强的化学稳定性，在常规条件下不易溶解。目前，钽冶金最成熟的方法为氢氟酸浸出法，但该方法会产生大量含氟污染物，不利于环保。因此，在含钽二次资源利用中有必要开发无氟新方法。本文提出一种二次资源无氟浸出钽的工艺，首先将钽合金废料经氧化后与熔融KOH反应，再采用草酸和酒石酸混合有机酸浸出。研究结果表明，钽的浸出率达到98.6%。与传统氢氟酸浸出工艺相比，该无氟浸出工艺不仅提高了二次资源钽的回收率，而且有效减少了环境污染，对于钽资源的高效环保利用具有重要意义。更多还原

【Abstract】 Tantalum, a rare and refractory metal, is a vital strategic resource widely utilized in both defense and civilian applications. Due to the low grade of tantalum ores and their natural resource scarcity, the recovery of tantalum from secondary resources increases year by year. It is of significant importance. Tantalum has extremely high chemical stability and is not easily dissolved under normal conditions. Currently, the mature method for extracting tantalum is the hydrogen fluoride(HF) method, which generates a large amount of fluoride-containing pollutants, posing environmental challenges. Therefore, it is necessary to develop fluoride-free methods for the recovery of tantalum from secondary resources. A fluoride-free process for leaching tantalum from secondary resources was proposed. In this process, tantalum alloy waste was oxidized and then reacted with molten KOH. Subsequently, the obtained mixture was leached with a mixture of oxalic acid and tartaric acid. The results show that the tantalum leaching efficiency reaches 98.6%. Compared with the traditional HF leaching process, this fluoride-free method not only improves the recovery of tantalum from secondary resources but also effectively reduces environmental pollution. This process shows significant value for the efficient and environmentally friendly utilization of tantalum resources.更多还原