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<p>This study investigated the use of biomass ash as an additive for reducing the boron (B) content in industrial silicon (Si). Coffee shell, a biomass rich in alkali earth metals, was selected for its potential to effectively remove non-metallic impurities from industrial silicon. A series of single-factor experiments was designed to systematically examine the effects of biomass ash content, smelting temperature, and refining time on B removal. The experimental results indicated that under optimized process conditions, the ideal biomass ash addition was 5 wt.%, the suitable smelting temperature was 1500℃, and the optimal refining time was 240&#xa0;min. Under these conditions, the B content in industrial Si was significantly reduced from 100.46 ppmw to 12.08 ppmw, thereby achieving a removal rate of 87.98%. This method offered a novel approach for purifying industrial Si and facilitating the effective utilization of biomass resources. It has significant implications for advancing the sustainable development of the Si materials industry.</p>

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Study on the Efficient Removal of Boron Impurities in Silicon Melting Using Biomass Ash Additive

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Meng Liu,
  • Zhengjie Chen,
  • Wenhui Ma,
  • Jijun Wu,
  • Chenggang Tao,
  • Lin Wang

摘要

This study investigated the use of biomass ash as an additive for reducing the boron (B) content in industrial silicon (Si). Coffee shell, a biomass rich in alkali earth metals, was selected for its potential to effectively remove non-metallic impurities from industrial silicon. A series of single-factor experiments was designed to systematically examine the effects of biomass ash content, smelting temperature, and refining time on B removal. The experimental results indicated that under optimized process conditions, the ideal biomass ash addition was 5 wt.%, the suitable smelting temperature was 1500℃, and the optimal refining time was 240 min. Under these conditions, the B content in industrial Si was significantly reduced from 100.46 ppmw to 12.08 ppmw, thereby achieving a removal rate of 87.98%. This method offered a novel approach for purifying industrial Si and facilitating the effective utilization of biomass resources. It has significant implications for advancing the sustainable development of the Si materials industry.