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Production and Purification of Silicon by Magnesiothermic Reduction of Silica Fume.

机译：镁烟气的镁热还原法生产和纯化硅。

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摘要

A new approach is discussed for the generation of high purity silicon from silica fume (SF), which is a waste by-product from the manufacture of metallurgical grade silicon. Process steps were developed and optimized for this purpose. These include purification of SF, reduction by magnesium, and post-reduction acid leaching. SF is first subjected to an initial leaching with HCl to remove soluble impurities. Reduction was carried out successfully in a sealed reaction chamber with varying Mg/SF ratios, temperature and time. Mg/SF ratio, temperature and time affected the production of silicon from SF with the intermediate compounds Mg2Si and Mg2SiO 4 also forming. Suitable reduction conditions were found to be within the temperature range 750-850°C and at approximately 2:1 ratio of Mg/SF. Reduction products were treated using a three stage acid leaching. XRD, QXRD and ICP analyses of the final silicon powder product indicated that silicon with low impurity levels particularly low boron content can be produced. Therefore, silicon produced by magnesiothermic reduction can be an attractive source for the production of solar grade silicon.
机译：讨论了一种由硅粉（SF）生成高纯度硅的新方法，硅粉是冶金级硅生产中的废副产品。为此开发并优化了工艺步骤。这些包括SF的纯化，镁的还原和还原后的酸浸。 SF首先用HCl进行初始浸提以去除可溶性杂质。还原反应是在密闭的反应室内以不同的Mg / SF比，温度和时间成功进行的。 Mg / SF比，温度和时间影响了SF的硅产量，同时还形成了中间化合物Mg2Si和Mg2SiO 4。发现合适的还原条件在750-850℃的温度范围内，并且Mg / SF的比例为约2∶1。还原产物使用三阶段酸浸处理。最终硅粉产品的XRD，QXRD和ICP分析表明，可以生产出杂质含量低，特别是硼含量低的硅。因此，通过镁热还原法生产的硅可以是生产太阳能级硅的有吸引力的来源。

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  • 作者

    Sadique, Sarder Elius.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 M.A.Sc.
  • 年度 2010
  • 页码 79 p.
  • 总页数 79
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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