Bioleaching of tungsten-rich spent hydrocracking catalyst using Penicillium simplicissimum

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• 作者：F. Amiri^a ; S. Yaghmaei^a ; ^{yaghmaei@sharif.edu} ; S.M. Mousavi^b ; ^c ; ^{mousavi_m@modares.ac.ir}
• 关键词：Spent catalyst ; Bioleaching ; Tungsten ; Penicillium simplicissimum
• 刊名：Bioresource Technology
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：102
• 期：2
• 页码：1567-1573
• 全文大小：391 K

文摘

Adaptation of Penicillium simplicissimum with different heavy metals present in a spent hydrocracking catalyst, as well as one-step, two-step, and spent medium bioleaching of the spent catalyst by the adapted fungus, was examined in batch cultures. Adaptation experiments with the single metal ions Ni, Mo, Fe, and W showed that the fungus could tolerate up to 1500 mg/L Ni, 8000 mg/L Mo, 3000 mg/L Fe, and 8000 mg/L W. In the presence of multi-metals, the fungus was able to tolerate up to 300 mg/L Ni, 200 mg/L Mo, 150 mg/L Fe and 2500 mg/L W. A total of 3 % (w/v) spent catalyst generally gave the maximum extraction yields in the two-step bioleaching process (100 % of W, 100 % of Fe, 92.7 % of Mo, 66.43 % of Ni, and 25 % of Al). The main lixiviant in the bioleaching was shown to be gluconic acid. The red pigment produced by the fungus could also possibly act as an agent in Al leaching.