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Recovering Secondary REE Value from Spent Oil Refinery Catalysts Using Biogenic Organic Acids

机译：使用生物有机酸从废油炼油厂催化剂中回收二次戒指

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Spent catalysts produced by oil refinery industries are regarded as an important secondary source for valuable metals. In particular, spent fluid catalytic cracking (FCC) catalysts represent a potential source for rare earth elements (REEs). This study aimed to exploit the leachability of spent FCC catalysts as a secondary source for La, by using an alternative organic acid lixiviant produced under optimized fungal fermentation conditions. The first chemical leaching tests revealed that citric acid (100 mM) is a comparable alternative lixiviant to conventional inorganic acids (1 M) and that the La dissolution behavior changed significantly with different types of organic acids. The initial fungal fermentation conditions (e.g., inoculum level, substrate concentration, pH) largely affected the resultant biogenic acid composition, and its manipulation was possible in order to almost solely ferment citric acid (~130 mM) while controlling the production of unwanted oxalic acid. The performance of actual biogenic acids (direct use of cell-free spent media) and artificially reconstituted biogenic acids (a mixture of chemical reagents) was nearly identical, achieving a final La dissolution of ~74% at a pulp density of 5%. Overall, the microbiological fermentation of organic acids could become a promising approach to supply an efficient and environmentally benign alternative lixiviant for REE scavenging from spent FCC catalyst wastes.
机译：炼油厂生产的废催化剂被认为是有价值金属的重要二级来源。特别地，废液催化裂化（FCC）催化剂代表稀土元素（REES）的潜在来源。本研究旨在利用在优化的真菌发酵条件下生产的替代有机酸李肝作为LA的二级源的废FCC催化剂的可浸出性。第一种化学浸出试验显示柠檬酸（> 100mm）是常规无机酸（1M）的可比较替代液，并且La溶解行为随着不同类型的有机酸而变化显着变化。最初的真菌发酵条件（例如，接种水平，底物浓度，pH）很大地影响所得的生物酸组合物，并且其操纵是可能的，以便几乎单独发酵柠檬酸（〜130mm），同时控制不需要的草酸的产生。实际的生物酸的性能（直接使用无细胞废介质）和人工重构的生物酸（化学试剂的混合物）几乎相同，实现最终的La溶解〜74％的纸浆密度为5％。总的来说，有机酸的微生物发酵可能成为一种有望的方法，可以提供一种高效和环境良性替代的李克西敏捷，用于从CCC催化剂废弃物中提供REE清除。

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