An efficient method to purify metallurgical grade Si by electromagnetic semi-continuous casting of Al-30Si melt

An efficient method to purify metallurgical grade Si by electromagnetic semi-continuous casting of Al-30Si melt
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Al-30Si熔体电磁半连续铸造提纯冶金级Si的有效方法

DOI:
10.1016/j.matlet.2016.08.103
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发表时间:
2016-12
期刊:
影响因子:
3
通讯作者:
Li Tingju
Li Tingju
中科院分区:
材料科学3区
文献类型:
--
作者:
Zou Qingchuan;Jie Jinchuan;Wang Tongmin;Li Tingju

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本文报道了一种简单、节能的太阳能电池材料用冶金级硅(MG-Si)提纯方法。在半连续铸造过程中,利用旋转磁场(RMF)将初晶Si从过共晶Al-30 Si熔体中连续分离出来,制备出了细化Si。对精炼硅的净化试验表明,电磁分离只需两次凝固精炼,几乎所有金属元素的含量都可以降低到太阳能级水平(≤0.1 ppmw),而非金属杂质B和P的含量则可以通过三次凝固精炼有效地控制在可接受的水平(B<0.3 ppmw,P<0.5 ppmw)。
This paper reported a very simple and energy-saving method to refine metallurgical grade Si (MG-Si) for use in solar cell materials. Refined Si was prepared by using a rotating magnetic field (RMF) to separate the primary Si continuously from hypereutectic Al-30Si melt during semi-continuous casting. Purification testing of the refined Si indicates that the contents of almost all metallic elements can be reduced to the solar grade levels (≤0.1 ppmw) by electromagnetic separation with solidification refining just twice, while those of the non-metallic impurities B and P can be effectively controlled within the acceptable levels (B<0.3 ppmw, P<0.5 ppmw) by solidification refining for three times.
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