Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag

doi:10.1016/j.cjche.2022.10.013

中国化学工程学报 ›› 2023, Vol. 58 ›› Issue (6): 11-19.DOI: 10.1016/j.cjche.2022.10.013

• Full Length Article • 上一篇下一篇

Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag

Jiangshan Qu^1,2, Jianbo Zhang¹, Huiquan Li^1,2, Shaopeng Li¹, Da Shi^1,3, Ruiqi Chang^1,2, Wenfen Wu¹, Ganyu Zhu¹, Chennian Yang¹, Chenye Wang¹

1. CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

收稿日期:2022-08-26 修回日期:2022-10-24 出版日期:2023-06-28 发布日期:2023-08-31
通讯作者: Huiquan Li,E-mail:hqli@ipe.ac.cn
基金资助:
The work was finally supported by the National Natural Science Foundation of China (52174390, U1810205), Innovation Academy for Green Manufacture of the Chinese Academy of Sciences China (IAGM2022D04), and Strategic Priority Research Program of the Chinese Academy of Sciences China (XDA21040601).

Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag

Jiangshan Qu^1,2, Jianbo Zhang¹, Huiquan Li^1,2, Shaopeng Li¹, Da Shi^1,3, Ruiqi Chang^1,2, Wenfen Wu¹, Ganyu Zhu¹, Chennian Yang¹, Chenye Wang¹

1. CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

Received:2022-08-26 Revised:2022-10-24 Online:2023-06-28 Published:2023-08-31
Contact: Huiquan Li,E-mail:hqli@ipe.ac.cn
Supported by:
The work was finally supported by the National Natural Science Foundation of China (52174390, U1810205), Innovation Academy for Green Manufacture of the Chinese Academy of Sciences China (IAGM2022D04), and Strategic Priority Research Program of the Chinese Academy of Sciences China (XDA21040601).

摘要/Abstract

摘要： Coal gasification slag (CGS) is a type of solid waste produced during coal gasification, in which heavy metals severely restrict its resource utilization. In this work, the mineral occurrence and distribution of typical heavy metal Cr in CGS is investigated. The leaching behavior of Cr under different conditions is studied in detail. Acid leaching-selective oxidation-coprecipitation method is proposed based on the characteristics of Cr in CGS. The detoxification of Cr in CGS is realized, and the detoxification mechanism is clarified. Results show that Cr is highly enriched in CGS. The speciation of Cr is mainly residual fraction (74.47%-86.12%), which is combined with amorphous aluminosilicate. Cr³⁺ and Cr⁶⁺ account for 90.93%-94.82% and 5.18%-9.07% of total Cr, respectively. High acid concentration and high liquid-solid ratio are beneficial to destroy the lattice structure of amorphous aluminosilicate, thus improving the leaching efficiency of Cr, which can reach 97.93% under the optimal conditions. Acid leaching-selective oxidation-coprecipitation method can realize the detoxification of Cr in CGS. Under the optimal conditions, the removal rates of Fe³⁺ and Cr³⁺ in the leaching solution are 80.99%-84.79% and 70.58%-71.69%, respectively, while the loss rate of Al³⁺ is only 1.10%-3.35%. Detoxification slag exists in the form of Fe-Cr coprecipitation (Fe_1-xCr_xOOH), which can be used for smelting. The detoxification acid leaching solution can be used to prepare inorganic polymer composite coagulant poly-aluminum chloride (PAC). This study can provide theoretical and data guidance for detoxification of heavy metal Cr in CGS and achieve resource utilization of coal gasification solid waste.

关键词: Coal gasification slag, Heavy metal, Distributions, Leaching, Detoxification, Precipitation

Abstract: Coal gasification slag (CGS) is a type of solid waste produced during coal gasification, in which heavy metals severely restrict its resource utilization. In this work, the mineral occurrence and distribution of typical heavy metal Cr in CGS is investigated. The leaching behavior of Cr under different conditions is studied in detail. Acid leaching-selective oxidation-coprecipitation method is proposed based on the characteristics of Cr in CGS. The detoxification of Cr in CGS is realized, and the detoxification mechanism is clarified. Results show that Cr is highly enriched in CGS. The speciation of Cr is mainly residual fraction (74.47%-86.12%), which is combined with amorphous aluminosilicate. Cr³⁺ and Cr⁶⁺ account for 90.93%-94.82% and 5.18%-9.07% of total Cr, respectively. High acid concentration and high liquid-solid ratio are beneficial to destroy the lattice structure of amorphous aluminosilicate, thus improving the leaching efficiency of Cr, which can reach 97.93% under the optimal conditions. Acid leaching-selective oxidation-coprecipitation method can realize the detoxification of Cr in CGS. Under the optimal conditions, the removal rates of Fe³⁺ and Cr³⁺ in the leaching solution are 80.99%-84.79% and 70.58%-71.69%, respectively, while the loss rate of Al³⁺ is only 1.10%-3.35%. Detoxification slag exists in the form of Fe-Cr coprecipitation (Fe_1-xCr_xOOH), which can be used for smelting. The detoxification acid leaching solution can be used to prepare inorganic polymer composite coagulant poly-aluminum chloride (PAC). This study can provide theoretical and data guidance for detoxification of heavy metal Cr in CGS and achieve resource utilization of coal gasification solid waste.

Key words: Coal gasification slag, Heavy metal, Distributions, Leaching, Detoxification, Precipitation

Jiangshan Qu, Jianbo Zhang, Huiquan Li, Shaopeng Li, Da Shi, Ruiqi Chang, Wenfen Wu, Ganyu Zhu, Chennian Yang, Chenye Wang. Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag[J]. 中国化学工程学报, 2023, 58(6): 11-19.

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Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag

Occurrence, leaching behavior, and detoxification of heavy metal Cr in coal gasification slag

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