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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Recovery of silicon from silica fume
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Recovery of silicon from silica fume

机译：从硅粉中回收硅

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摘要

Feasibility of producing high purity silicon from amorphous silica fume, using a low temperature magnesiothermic reduction was demonstrated. Commercial silica fume containing 97.5% amorphous silica was first purified by acid leaching and roasting to remove large quantities of transition metals and carbon. The product was then reduced using magnesium as the reductant. The effect of the amount of reductant, initial temperature, and dwell time were investigated on the quantity and type of the reaction products. The optimum reduction conditions were decided based on the maximum yield of the Si metal. These corresponded to Mg/SiO_2 molar ratio of 2.0, preheating temperature of 750 °C, and holding time of 2 h. High purity silicon (> 99 wt.%) containing < 3 ppmw B and 12 ppmw P was obtained after leaching purification of the reduction products, showing that the material is superior to metallurgical grade silicon, for use as solar-grade silicon feedstock.
机译：证明了使用低温镁热还原法由无定形硅粉生产高纯度硅的可行性。首先通过酸浸和焙烧来纯化包含97.5％无定形二氧化硅的市售硅粉，以除去大量的过渡金属和碳。然后使用镁作为还原剂还原产物。研究了还原剂的量，初始温度和停留时间对反应产物的数量和类型的影响。最佳还原条件取决于硅金属的最大产率。这些对应于2.0的Mg / SiO 2摩尔比，750℃的预热温度和2h的保持时间。在对还原产物进行浸提纯化之后，获得了含有<3 ppmw B和12 ppmw P的高纯度硅（> 99 wt。％），表明该材料优于用作太阳能级硅原料的冶金级硅。

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