Preparation of ultrafine WC-Co powder via fluidized bed

doi:10.1016/j.cjche.2024.04.023

Chinese Journal of Chemical Engineering ›› 2024, Vol. 73 ›› Issue (9): 15-26.DOI: 10.1016/j.cjche.2024.04.023

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Preparation of ultrafine WC-Co powder via fluidized bed

Huijun Shang¹, Hengli Li^1,2, Weijun Li², Feng Pan^1,3, Zhan Du^1,4

1. State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China;
2. College of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China;
3. College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4. Chinalco Environmental Protection and Energy Conservation Group Co., Ltd., Xiong'an 071700, China

Received:2024-01-19 Revised:2024-03-12 Accepted:2024-04-22 Online:2024-06-05 Published:2024-11-21
Contact: Feng Pan,E-mail:fpan@ipe.ac.cn;Zhan Du,E-mail:zdu@ipe.ac.cn
Supported by:
The authors wish to gratefully acknowledge financial support from the National Natural Science Foundation of China (22078326, 21878305).

Preparation of ultrafine WC-Co powder via fluidized bed

Huijun Shang¹, Hengli Li^1,2, Weijun Li², Feng Pan^1,3, Zhan Du^1,4

1. State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences (CAS), Beijing 100190, China;
2. College of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China;
3. College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4. Chinalco Environmental Protection and Energy Conservation Group Co., Ltd., Xiong'an 071700, China

通讯作者: Feng Pan,E-mail:fpan@ipe.ac.cn;Zhan Du,E-mail:zdu@ipe.ac.cn
基金资助:
The authors wish to gratefully acknowledge financial support from the National Natural Science Foundation of China (22078326, 21878305).

Abstract

Abstract: In this study, the effects of reaction parameters on the deep-reduction and carbonization process of WO₂-Co to WC-Co were studied. The results indicate that the oxygen loss rate of WO₂ is positively correlated with temperature and methane partial pressure. The partial pressure of methane has no significant effect on the formation rate of WC. The carbon content and particle size of the product increase with the increase of CH₄ partial pressure. By synergistically regulating the reaction temperature to 950 ℃, the CH₄ partial pressure to 1.25%, and the reaction time to 60 min, ultrafine WC-Co powder without η phase can be obtained. The particle size of the composite powder is 128 nm, with total carbon content of 6.16%, free carbon content of 0.4%, and residual oxygen content of 0.05%, respectively. The growth rate relationship of tungsten carbide is as follows: δ(t)=1.21×10^-13 exp $ \left(-\frac{12809.72}{T}\right) \sqrt{t}$.

Key words: Ultrafine WC-Co powder, Gas-solid reaction, Fluidization, Reaction process regulation, Growth rate equation

摘要： In this study, the effects of reaction parameters on the deep-reduction and carbonization process of WO₂-Co to WC-Co were studied. The results indicate that the oxygen loss rate of WO₂ is positively correlated with temperature and methane partial pressure. The partial pressure of methane has no significant effect on the formation rate of WC. The carbon content and particle size of the product increase with the increase of CH₄ partial pressure. By synergistically regulating the reaction temperature to 950 ℃, the CH₄ partial pressure to 1.25%, and the reaction time to 60 min, ultrafine WC-Co powder without η phase can be obtained. The particle size of the composite powder is 128 nm, with total carbon content of 6.16%, free carbon content of 0.4%, and residual oxygen content of 0.05%, respectively. The growth rate relationship of tungsten carbide is as follows: δ(t)=1.21×10^-13 exp $ \left(-\frac{12809.72}{T}\right) \sqrt{t}$.

关键词: Ultrafine WC-Co powder, Gas-solid reaction, Fluidization, Reaction process regulation, Growth rate equation

Huijun Shang, Hengli Li, Weijun Li, Feng Pan, Zhan Du. Preparation of ultrafine WC-Co powder via fluidized bed[J]. Chinese Journal of Chemical Engineering, 2024, 73(9): 15-26.

Huijun Shang, Hengli Li, Weijun Li, Feng Pan, Zhan Du. Preparation of ultrafine WC-Co powder via fluidized bed[J]. 中国化学工程学报, 2024, 73(9): 15-26.

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Preparation of ultrafine WC-Co powder via fluidized bed

Preparation of ultrafine WC-Co powder via fluidized bed

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