Leaching of heavy metals and their impacting factors from a spent catalyst in the refinery industry

LI Xin; QIN Jihong; SUN Hui; GAN Zhiwei; CHEN Wenqing; LI Zhi

doi:10.7524/j.issn.0254-6108.2020092301

2021 Volume 40 Issue 4

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LI Xin, QIN Jihong, SUN Hui, GAN Zhiwei, CHEN Wenqing, LI Zhi. Leaching of heavy metals and their impacting factors from a spent catalyst in the refinery industry[J]. Environmental Chemistry, 2021, (4): 1147-1156. doi: 10.7524/j.issn.0254-6108.2020092301

Citation:

LI Xin, QIN Jihong, SUN Hui, GAN Zhiwei, CHEN Wenqing, LI Zhi. Leaching of heavy metals and their impacting factors from a spent catalyst in the refinery industry[J]. Environmental Chemistry, 2021, (4): 1147-1156. doi: 10.7524/j.issn.0254-6108.2020092301

Leaching of heavy metals and their impacting factors from a spent catalyst in the refinery industry

1. Department of Environmental Science and Engineering, Sichuan University, Chengdu, 610065, China;
2. Department of Environmental Engineering, Chengdu University, Chengdu, 610106, China

Corresponding author: LI Zhi, lizhi_scu@scu.edu.cn
Received Date: 23/09/2020

Fund Project: Supported by the National Key Technology R&D Program of China (2018YFC1900103).

Abstract

Serial batch leaching and column leaching were used to study the release characteristics of heavy metals in spent catalysts exposed to the environment. The extraction solutions used in the column leaching was pH 4.5, pH 7.0, and a concentration of 20 mg·L^-1 of the DOM solution at pH 7.0, the liquid-solid ratio of the serial batch leaching was 5:1, 10:1, and 20:1, and the pH value of the extraction solutions was 4.5. The results show that, in serial batch leaching, under acidic conditions, the leaching rate of heavy metals in the spent catalyst first increases then decreases as the liquid-solid ratio increases. The leaching system is a saturated state when the liquid-solid ratio is small, the leaching system gradually becomes unsaturated and the leaching rate gradually increases as the liquid-solid ratio increases. The leaching rate is not affected by the liquid-solid ratio when the liquid-solid ratio's controlling effect on the leaching of heavy metal elements in the spent catalyst exceeds the threshold. The leaching mechanism is affected by the multiple control effects of the saturation state of the leaching system, the occurrence state of heavy metal elements, and the liquid-solid ratio. In column leaching, acidic solution promoted the leaching of heavy metal in spent catalysts, and the cumulative release rate increased. Compared with neutral conditions, the average leaching rate under acidic conditions increased by 13.4%, acidic conditions did not change the leaching mechanism of heavy metal in spent catalysts. Dissolved organic matter solution promote the leaching, and the cumulative release rate is significantly increased. Compared with neutral conditions, the average leaching rate under dissolved organic matter conditions has increased by 19.6%, and the dissolved organic matter conditions have not Change the leaching mechanism of heavy metal in spent catalysts. The maximum release rate of heavy metals in serial batch leaching is greater than column leaching, and the leaching mechanism of heavy metals in serial batch leaching is more susceptible to external conditions and their has greater environmental risks. Therefore, measures should be taken to rain protection and leakage prevention during the storage, transportation and disposal of spent catalysts to avoid the transfer of heavy metals in the spent catalysts to environmental media such as surface water, groundwater and soil,and prevent greater environmental damage.
- spent catalyst,
- heavy metals,
- column leaching,
- serial batch leaching

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Leaching of heavy metals and their impacting factors from a spent catalyst in the refinery industry

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通讯作者: 陈斌, bchen63@163.com

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