Metal recovery from spent hydrodesulfurization catalysts using a combined acid-leaching and electrolysis process.
Metal recovery from spent hydrodesulfurization catalysts using a combined acid-leaching and electrolysis process.
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DOI：
10.1016/j.jhazmat.2007.10.061
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发表时间：
2008-06
影响因子：
13.6
通讯作者：
Yi‐Chieh Lai;Wen‐Jhy Lee;Kuo-Lin Huang;Chu Wu
中科院分区：
文献类型：
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作者：
Yi‐Chieh Lai;Wen‐Jhy Lee;Kuo-Lin Huang;Chu Wu
本研究的重点是使用酸浸和流化床电解相结合的工艺从废加氢脱硫 (HDS) 催化剂中回收有价值的金属。电解池配备有玻璃珠介质、氧化铱网阳极和不锈钢板阴极。发现由体积比为 2:1:1 的浓 HNO3/H2SO4/HCl 组成的酸溶液比其他测试溶液（HNO3/H2SO4=1:1）更能浸出金属。对于三酸混合物，最佳固液比和浸出时间分别为40g/L和1h，温度为70℃；在此条件下，第一阶段浸出目标金属（Mo、Ni、V）的浸出率分别达到90%、99%和99%，远高于第二阶段/第三阶段/第四阶段的浸出率。当该酸浸液在2A恒流（电流密度=~35.7mA/cm2）下电解2h时，观察到稳定的电池电压为5V。 Mo、Ni 和 V 的电解回收率分别约为 15%、61% 和 66%，但将电解时间从 2 小时延长至 4 小时并没有增加回收率。对于该操作，Mo、Ni 和 V 的总回收率（浸出率×电解回收率）分别约为 14%、60% 和 65%。
This study focuses on recovering valuable metals from spent hydrodesulfurization (HDS) catalysts using a combined acid-leaching and fluidized-bed electrolysis process. The electrolytic cell was equipped with a glass bead medium, an iridium oxide mesh anode, and a stainless steel plate cathode. An acid solution consisting of concentrated HNO3/H2SO4/HCl with a volume ratio of 2:1:1 was found to be better than the other tested solution (HNO3/H2SO4=1:1) to leach the metals. For the three-acid mixture, the best solid/liquid ratio and leaching time were 40g/L and 1h, respectively, at 70°C; under this condition, the leaching yields of target metals (Mo, Ni, and V) in the 1st stage of leaching reached 90, 99, and 99%, respectively, much higher than those in the 2nd/3rd/4th stages. When this acid leachate was electrolyzed for 2h at 2A constant current (current density=∼35.7mA/cm2), a stable cell voltage of 5V was observed. The electrolytic recoveries of Mo, Ni, and V were ∼15, 61, and 66%, respectively, but extending the electrolysis time from 2 to 4h did not increase the recoveries. For this operation, the total recoveries (leaching yield×electrolytic recovery) of Mo, Ni, and V were ∼14, 60, and 65%, respectively.