Spent HDS catalyst is an important secondary resource for extracting molybdenum. This study aimed to introduce a comprehensive process for separating and recovering molybdenum from the roasted spent HDS catalysts. The brief flow of the novel technology contains pressure Na₂CO₃ liquor leaching, selective extraction of molybdenum using N263, and circulating leaching of raffinate. The molybdenum in roasted spent HDS catalysts can be leached by pressure Na₂CO₃ liquor with a molybdenum leaching of 95.4%. Methyl trioctyl ammonium carbonate (N263) can effectively separate molybdenum from the leach liquor, and the extraction and stripping of Mo were 99.8% and 99.5%, respectively. The raffinate can be returned to the pressure leaching process for recycling, and the leaching of molybdenum was 94.3%. Compared with currently applied technologies, the novel technology is characterized by higher recovery of Mo and raffinate circulation leaching.

Graphical Abstract

中文翻译：

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从废 HDS 催化剂中提取钼的新技术

用过的 HDS 催化剂是提取钼的重要二次资源。本研究旨在介绍一种从焙烧的废 HDS 催化剂中分离和回收钼的综合工艺。新技术的简要流程包括加压Na ₂ CO ₃液浸出、N263选择性提取钼和萃余液循环浸出。焙烧过的 HDS 催化剂中的钼可以通过压力 Na ₂ CO _3浸出钼浸出95.4%的白酒。甲基三辛基碳酸铵（N263）能有效地从浸出液中分离出钼，Mo的提取率和反萃取率分别为99.8%和99.5%。萃余液可返回加压浸出工艺循环利用，钼的浸出率为94.3%。与目前应用的技术相比，该新技术的特点是Mo回收率较高，并采用萃余液循环浸出。

图形概要