ABSTRACT Spent catalysts generated from petroleum refining contain some valuable metals and their surface is covered by elemental sulfur. During the recovery of valuable metals in the spent catalysts, the sulfur present in the surface of spent catalyst should be treated. In order to develop an environment-friendly process to treat these spent catalysts, the dissolution behavior of elemental sulfur between nonaqueous solvents (octanol/decanol) and NaOH solution was compared, which has never been reported. Sulfur was dissolved in decanol and octanol and the dissolved sulfur was recrystallized as the solution cooled to room temperature. The optimum treatment conditions of sulfur in nonaqueous solvents were obtained. The interaction of sulfur with these nonaqueous solvents was analyzed through a radical mechanism and its mechanism was first proposed in the current work. Unlike the treatment of sulfur with decanol and octanol, the dissolution of sulfur in NaOH solution is assumed to occur through oxidation/reduction reaction and the optimum conditions were obtained. The application of these methods is expected to have a meaningful impact on the recovery of sulfur from spent catalyst materials.

中文翻译：

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低温水和非水溶液湿法冶金处理废催化剂中的元素硫

摘要石油精炼产生的废催化剂含有一些有价值的金属，其表面覆盖有元素硫。在回收废催化剂中的有价金属时，应处理废催化剂表面存在的硫。为了开发处理这些废催化剂的环境友好型工艺，比较了非水溶剂（辛醇/癸醇）和 NaOH 溶液之间元素硫的溶解行为，这是从未报道过的。硫溶解在癸醇和辛醇中，溶解的硫在溶液冷却至室温时重结晶。得到了硫在非水溶剂中的最佳处理条件。通过自由基机理分析了硫与这些非水溶剂的相互作用，其机理在目前的工作中首次被提出。与用癸醇和辛醇处理硫不同，假定硫在 NaOH 溶液中的溶解是通过氧化/还原反应发生的，并获得了最佳条件。预计这些方法的应用将对从废催化剂材料中回收硫产生有意义的影响。