Comparative study of K2CO3 and Na2CO3 in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash

MIAO Heng-yang; WANG Zhi-qing; LI Xiang-yu; MEI Yan-gang; LIU Zhe-yu; SONG Shuang-shuang; DONG Li-bo; HUANG Jie-jie; FANG Yi-tian

Volume 48 Issue 9

Sep. 2020

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Article Navigation > Journal of Fuel Chemistry and Technology > 2020 > 48(9): 1063-1070

MIAO Heng-yang, WANG Zhi-qing, LI Xiang-yu, MEI Yan-gang, LIU Zhe-yu, SONG Shuang-shuang, DONG Li-bo, HUANG Jie-jie, FANG Yi-tian. Comparative study of K2CO3 and Na2CO3 in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash[J]. Journal of Fuel Chemistry and Technology, 2020, 48(9): 1063-1070.

Citation:

MIAO Heng-yang, WANG Zhi-qing, LI Xiang-yu, MEI Yan-gang, LIU Zhe-yu, SONG Shuang-shuang, DONG Li-bo, HUANG Jie-jie, FANG Yi-tian. Comparative study of K₂CO₃ and Na₂CO₃ in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash[J]. Journal of Fuel Chemistry and Technology, 2020, 48(9): 1063-1070.

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Comparative study of K₂CO₃ and Na₂CO₃ in the process of coal gangue catalytic gasification coupled with aluminum extraction from gasification ash

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Taiyuan Institute of Technology, Taiyuan 030008, China

Funds:

The project was supported by the National Natural Science Foundation of China 21506242

Received Date: 2020-07-27
Rev Recd Date: 2020-09-05

Available Online: 2021-01-23

Publish Date: 2020-09-10

Abstract

Abstract

Coal gangue as the research object of this study, the effects of Na₂CO₃ and K₂CO₃ on the gasification reactivity and the dissolution behavior of Al from catalytic gasification were compared. At the same time, X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were used to analyze the thermal-conversion process of mineral in coal gangue with different catalysts and at different temperatures. The results show that compared with K₂CO₃, Na₂CO₃ can react more easily with the kaolinite in coal gangue to form nepheline, which can achieve effective separation of aluminum and silicon by acid leaching. Moreover, using Na₂CO₃ as catalyst, the Al extraction rate of gasification ash treated by hydrochloric acid can reach 92.3%, while it can only reach 83.7% using K₂CO₃ as catalyst. Therefore, Na₂CO₃ has better selectivity for the coal gangue catalytic gasification coupled with aluminum extraction from gasification ash.
- aluminum leaching rate,
- Na₂CO₃,
- K₂CO₃,
- minerals transformation

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References(33)

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