Spent catalysts being considered hazardous wastes exhibit a high metal content in mobile forms. In addition, growing demand for circular economy policy applications requires proper utilization of these wastes. This study aimed at the assessment of vanadium leaching from spent desulfurization catalyst derived from sulfuric acid plant dump located nearby a copper smelter. Chemical and phase composition of the catalyst has been characterized. The extraction has been performed using chemical (0.1-M and 1-M citric acid) and biological (biotic solution with Acidithiobacillus thiooxidans) methods, using different experimental parameters (pulp density, particle size, leaching time) to observe V leaching behavior and kinetics. The results revealed that both citric acid and bacteria carried out the extraction process well. The optimal parameters for acid leaching were < 0.2-mm particle size and 2% pulp density, which allowed to leach out 95% of V from spent catalyst within 48 h. The bacterially mediated extraction resulted in 93% V leached out within 21 days with 2% pulp density. The experiments showed that V present in the catalyst is susceptible to bioleaching and organic acid leaching with the latter being a quicker process.

用过的催化剂被认为是危险废物，其流动形式的金属含量很高。另外，对循环经济政策应用的需求不断增长，需要适当利用这些废物。这项研究旨在评估从位于铜冶炼厂附近的硫酸厂废料中提取的废脱硫催化剂中的钒浸出。已经表征了催化剂的化学和相组成。提取使用化学试剂（0.1-M和1-M柠檬酸）和生物试剂（硫代酸性氧化硫杆菌的生物溶液）进行）方法，使用不同的实验参数（纸浆密度，粒度，浸出时间）观察V浸出行为和动力学。结果表明，柠檬酸和细菌均能很好地进行提取。酸浸的最佳参数是<0.2毫米粒径和2％的纸浆密度，可在48小时内从废催化剂中浸出95％的V。细菌介导的提取导致在21天内沥滤出93％的V，果肉密度为2％。实验表明，存在于催化剂中的V易于生物浸出和有机酸浸出，后者是一个较快的过程。