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Basic Research on Boron and Main Metallic Impurities Removal from Silicon Using Slag Refining Followed by Acid Leaching

Abstract

目前,硅是光伏产业中应用最为广泛的一种材料,其纯度要求达到99.9999%(6N),其中,硼杂质的含量要严格控制在0.3ppmw以下。冶金法作为一种高效、绿色、低成本的提纯技术,适合我国光伏产业发展的需求,其中,造渣精炼是冶金法中一种有效的除硼方法。 本论文采用造渣精炼法去除工业硅中硼杂质,研究渣剂和工艺对除硼的影响,得出硼杂质的去除机理和动力学模型。此外,结合酸洗工艺去除硅中金属杂质,研究其浸出行为和动力学模型。最后,对造渣过程中产生的废渣进行回收再利用。本论文的研究成果,为造渣精炼的工业应用提供理论依据,其主要研究结果如下: (1)采用CaO-SiO2-CaF2渣剂除硼,造渣精炼后,硅...At present, silicon has been one of the most widely used materials in the photovoltaic industry, of which requires the purity up to 99.9999% (6N), and the content of boron impurity must be strictly controlled below 0.3 ppmw. As a high efficient, green, low cost purification technology, metallurgical method is suitable for the development of photovoltaic industry in China. Thereinto, slag refining ...学位:工学博士院系专业:材料学院_材料学学号:2072011015348

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