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首页> 外文会议>Gettering and defect engineering in semiconductor technology XVI >Potential Synthesis of Solar-Grade Silicon from Rice Husk Ash
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Potential Synthesis of Solar-Grade Silicon from Rice Husk Ash

机译：从稻壳灰中潜在合成太阳能级硅

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Rice husk, an agricultural waste product obtained in large quantities in many countries including Nigeria, is very rich in siliceous materials. It has been known for several decades that, with careful processing, rice husk can be a source of metallurgical grade silicon [1]. The question remains as to whether rice husk ash (RHA) can be purified by a cost-effective, low technology route to produce solar-grade silicon suitable for use in photovoltaic devices. In Nigeria this would have the benefit of transforming large volumes (> 600,000 tonnes per annum) of agricultural waste into a partial solution to that country's issue with energy distribution. In this work, high purity silica has been prepared from RHA (ashed at 700°C for 5 and 12 hours) using a hydrometallurgical process. We report on the effect of natural variations in the rice husk composition on the effectiveness of the hydrometallurgical purification; the effectiveness of each stage of the hydrometallurgical process in removing impurity elements. While the hydrometallurgical purification of RHA is effective in removing impurities such as Ti and Fe to levels below the limits of detection of X-ray fluorescence (XRF), B and P levels need to be reduced to < 10~(17)cm~(-3) well below the detection limits of XRF. The resultant silica has been subsequently reduced to metallurgical-grade silicon (MG-Si) by direct reduction using Mg powder.
机译：稻壳是在包括尼日利亚在内的许多国家中大量获得的农业废弃物，其硅质物质非常丰富。几十年来，众所周知，通过精心加工，稻壳可以成为冶金级硅的来源[1]。问题仍然在于是否可以通过具有成本效益的低技术路线来纯化稻壳灰（RHA），以生产适用于光伏设备的太阳能级硅。在尼日利亚，这样做的好处是可以将大量（每年> 600,000吨）农业废弃物转化为该国能源分配问题的部分解决方案。在这项工作中，使用湿法冶金法从RHA（在700°C下灰化5和12小时）制备了高纯度二氧化硅。我们报道了稻壳组成的自然变化对湿法冶金提纯效果的影响。湿法冶金工艺各个阶段去除杂质元素的有效性。 RHA的湿法冶金纯化可以有效地将Ti和Fe等杂质去除至X射线荧光（XRF）检测极限以下的水平，但B和P的水平需要降低至<10〜（17）cm〜（ -3）远低于XRF的检测极限。随后通过使用Mg粉末直接还原将生成的二氧化硅还原为冶金级硅（MG-Si）。

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