Investigation of Plasma Process Efficacy for the Synthesis of High Purity Silicon

这个新项目的PyroGenesis加拿大公司，一家活跃于采用先进等离子体工艺设计和制造材料 ** 的公司，正在研究等离子体工艺合成高纯 ** 硅的效率。该公司在这个项目上面临着一些挑战。为了正确测量生产的 ** 硅的纯度，需要开发一种严格的方法来分析最终 ** 材料中存在的杂质。因此，公司提议与蒙特利尔魁北克大学Mathieu**Frenette教授的团队进行长期合作。等离子体雾化技术是近年来发展起来的一种生产微细、易流动金属粉末的技术。在该技术中，二氧化硅在高温下的碳热还原在等离子体中进行。电磁加热和 ** 混合与感应等离子体的组合允许以合理的成本纯化升级的冶金硅。本项目的目的是测定等离子体原子化法生产的硅中硼、铁、磷等杂质的含量。硼的定量特别复杂，因为在酸消化过程中 ** 硼氧化物蒸发，热解需要研究来解决这个问题。我们建议通过硼与甘露醇的络合来防止挥发性杂质的蒸发。将使用扫描电子显微镜（SEM）探索 ** 样品的大小，并将分别使用能量色散光谱法（EDS）和电感耦合等离子体质谱法 **（ICP-MS）确定其杂质百分比。该项目将导致对该公司生产的 ** 加工硅的杂质特性的实验结果。这将使公司能够设计和制造更合适的产品，并改善其性能。这将有助于公司的发展，并将对加拿大其他活跃在工程和材料加工领域的行业的发展产生影响。对这些产品杂质的控制也将有助于公司为加拿大的这些公司提供更好的硅粉生产服务。

This new project of PyroGenesis Canada Inc., an active company in the design and manufacture of materials**with advanced plasma processes, is the investigation of plasma process efficacy for the synthesis of high purity**silicon. The company is faced with some challenges for this project. To properly measure the purity of the**silicon produced, a rigorous method will need to be developed to analyze impurities present in the final**material. Therefore, the company has proposed a long-term collaboration with the team of Professor Mathieu**Frenette at the Université du Québec à Montréal. The plasma atomization is a recently-developed technology**that produces fine and flowable metal powders. In this technology, the carbothermic reduction of silicon**dioxide at high temperature is carried out in the plasma. The combination of electromagnetic heating and**mixing with inductive plasma allows to purify upgraded metallurgical silicon at reasonable cost. The objective**of project is to determine the impurities such as boron, iron and phosphorus content in the silicon that will be**manufactured by plasma atomization. Boron quantification is particularly complicated by the evaporation of**boron oxides during acid digestion and Pyrogenesis will require research to address this issue. We propose to**prevent the evaporation of volatile impurities with the complexation of boron with mannitol. The size of**samples will be explored with scanning electron microscopy (SEM) and the percentage of their impurities will**be determined with energy dispersive spectroscopy (EDS) and inductively coupled plasma mass spectrometry**(ICP-MS), respectively. This project will lead to the experimental results on the properties of the impurities of**processed silicon that will be manufactured by the company. This will enable the company to design and**manufacture more appropriate products and improve their properties. This will help the growth of the company**that will have impact on the development of other Canadian industries that are active in the engineering and**processing of materials. The control of impurities of these products will also help the company deliver a better**service of production of silicon powders to these companies in Canada.