Spent catalyst of molybdenum with silicon dioxide, commonly used as the carrier, is an important secondary resource for recovery of molybdenum. This work proposes a process to recycle molybdenum and remove silicon simultaneously by solvent extraction. The sulfuric acid leachate of the spent catalyst was contacted with the trialkylamine N235 (RN, R = C–C), to extract molybdenum and silicon. Several vital parameters were investigated to explore the influence on extraction and stripping. The extraction efficiencies of molybdenum and silicon were up to 99.6% and 77.1% after three-stage countercurrent extraction under optimized condition. The extraction reactions were determined by maximum loading capacity and FT-IR. The peak at 802.1 cm was caused by the stretching vibration of Si-O-Si, indicating the co-extraction of silicon. Molybdenum and silicon in the loaded organic phase can be stripped by the mixture of solution containing 7.00 mol/L NHOH and 0.80 mol/L (NH)CO, and the stripping efficiencies were >99.0%. Ammonium molybdate was prepared by removing silicon and evaporating, and the purity was 99.9%.

中文翻译：

---

使用三烷基胺（N235）从废催化剂的硫酸浸出液中同时提取钼和硅并回收纯钼酸铵


常用的以二氧化硅为载体的废钼催化剂是回收钼的重要二次资源。这项工作提出了一种通过溶剂萃取同时回收钼和去除硅的工艺。将废催化剂的硫酸浸出液与三烷基胺 N235（RN，R = C–C）接触，提取钼和硅。研究了几个重要参数，以探索对萃取和反萃的影响。在优化条件下，经过三级逆流萃取，钼和硅的萃取率分别达到99.6%和77.1%。萃取反应由最大负载量和 FT-IR 确定。 802.1 cm 处的峰是由 Si-O-Si 的伸缩振动引起的，表明硅的共萃取。含有7.00 mol/L NHOH和0.80 mol/L (NH)CO的溶液的混合物可以萃取负载有机相中的钼和硅，萃取效率>99.0%。通过除硅、蒸发制备钼酸铵，纯度为99.9%。