Applying Si-based alloy solvents to Si purification is considered an emerging technology for the production of solar-grade Si (SOG-Si). This study reviews the principle of solvent refining. Alloy systems such as Si–Al, Si–Sn, and Si–Fe are reviewed along with the Si separation method. The effects of solvent refining processing parameters, such as the solvent metal, cooling rate, heating method, and processing time, on boron and phosphorus segregation behaviors and Si purification efficiency are discussed. Experimental and theoretical investigations have shown that removal efficiencies greater than 90% can be achieved for B and P from metallurgical-grade Si using a Si–Al alloy. Meanwhile, separation methods, namely, flotation, filtration, acid leaching, and directional solidification, are used to separate the refined Si from the alloy. Finally, a method for the potential industrial production of SOG-Si is proposed.

将硅基合金溶剂应用于硅提纯被认为是生产太阳能级硅（SOG-Si）的新兴技术。这项研究回顾了溶剂精制的原理。诸如Si-Al，Si-Sn和Si-Fe之类的合金系统连同Si分离方法一起进行了综述。讨论了溶剂精制工艺参数（如溶剂金属，冷却速率，加热方法和工艺时间）对硼和磷的偏析行为和硅提纯效率的影响。实验和理论研究表明，使用Si–Al合金从冶金级Si中去除B和P可以达到90％以上的去除效率。同时，分离方法，即浮选，过滤，酸浸和定向凝固，用于从合金中分离出精制的Si。最后，