Recovery of silicon from silica fume
Recovery of silicon from silica fume
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DOI：
10.1016/j.jnoncrysol.2010.09.079
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发表时间：
2011-01-01
影响因子：
3.5
通讯作者：
Roy, R.
中科院分区：
文献类型：
--
作者：
Barati, M.;Sarder, S.;Roy, R.
论证了采用低温镁热还原法由无定形硅灰生产高纯硅的可行性。含97.5%无定形二氧化硅的工业硅灰首先通过酸浸和焙烧纯化，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。还原剂用量的影响。研究了初始温度和停留时间对反应产物的量和类型的影响。根据金属硅的最大产率确定了最佳还原条件。这些对应于Mg/SiO2摩尔比为2.0，预热温度为750 ℃，保持时间为2小时。高纯硅（> 99 wt. %）含有
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/SiO2 molar ratio of 2.0, preheating temperature of 750 degrees C, and holding time of 2 h. High purity silicon (>99 wt.%) containing