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The Study on the Purification of Waste Graphite Thermal Field Material of FZ-Si Crystal

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Abstract

The rapid development of the photovoltaic industry has led to increased demand for monocrystalline silicon. Numerous waste graphite devices are generated in the process of crystal pulling, and the waste graphite thermal field contains the largest proportion of graphite. Reports on graphite purification from the waste graphite thermal for photovoltaic crystal pulling are relatively rare. In this study, we purified waste graphite using a combined process of ferric induction roasting and acid-leaching. Through thermodynamic analysis, it is found that the appropriate material ratio is conducive to generating the appropriate target product, namely Fe3Si. Using ball milling mixture as raw material, the calcined product was obtained at 1300℃, 30% iron ratio and 90 min roasting time. XRD, SEM–EDS and XPS analysis methods showed that the calcined product phase was graphitic carbon and Fe3Si, which was consistent with thermodynamic calculation, and then HCl and HF leaching were carried out. High-purity graphite carbon (HPG) with fixed carbon content greater than 99.9% was obtained. The removal rates of Si, Fe, Al, Mg, Zn, Ni, Ti Ca, and Na were 99.58, 99.56, 99.89, 98.32, 99.26, 99.47, 99.62, 98.48, and 98.98%, respectively. Meanwhile, the HPG products with a purity of 99.98% were obtained.

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Data Availability

No datasets were generated or analysed during the current study.

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Acknowledgements

The authors are grateful for financial support from the the Major Projects of Yunnan Province (No. 202302AB080004) and the Ten Thousand Talent Plans for Young Top-notch Talents of Yunnan Province (No. YNWR-QNBJ-2020-022).

Funding

The authors are grateful for financial support from the the Major Projects of Yunnan Province (No. 202302AB080004) and the Ten Thousand Talent Plans for Young Top-notch Talents of Yunnan Province (No. YNWR-QNBJ-2020-022).

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Authors and Affiliations

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Yonghang Zhang, Zhengjie Chen, Keqiang Xie, Xiaowei Chen, Yiyou Hu & Wenhui Ma

  2. State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming, 650093, China

    Yonghang Zhang, Zhengjie Chen, Keqiang Xie, Xiaowei Chen, Yiyou Hu & Wenhui Ma

  3. The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China

    Zhengjie Chen, Keqiang Xie & Wenhui Ma

Authors
  1. Yonghang Zhang
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  2. Zhengjie Chen
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  3. Keqiang Xie
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  4. Xiaowei Chen
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Contributions

Yonghang Zhang: Conceptualization, Resources, Writing—review & editing, Visualization, Validation, Supervision. Zhengjie Chen: Conceptualization, Methodology, Validation, Formal analysis, Investigation, Data curation; Keqiang Xie: Conceptualization, Methodology, Validation, Formal analysis; Xiaowei Chen: Methodology, Formal analysis, Data curation; Yiyou Hu: Methodology, Formal analysis, Validation; Wenhui Ma: Formal analysis, Validation, Data curation.

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Correspondence to Zhengjie Chen.

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Zhang, Y., Chen, Z., Xie, K. et al. The Study on the Purification of Waste Graphite Thermal Field Material of FZ-Si Crystal. Silicon (2024). https://doi.org/10.1007/s12633-024-02988-9

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