熔盐电解-区域熔炼法制备太阳能级硅的工艺研究  

Process for Solar Grade Silicon Production by Molten Salt Electrolysis and Zone Melting

作　　者：孙东亚[1] 何丽雯[2] 廉冀琼[1] 谢安[1] 曾小兰[1] 杨若绵 

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024 [2]华侨大学材料科学与工程学院,福建厦门361021

出　　处：《材料工程》2015年第4期73-78,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50872037;11204258);福建省中青年教师教育科研项目(JB14077)

摘　　要：以高纯石英为原料,石墨坩埚和钨为电极材料,在CaCl2-LiCl混合熔盐(摩尔比9∶1)中电解制备Ca-Si合金,经区域熔炼提纯制得太阳能级硅(SG-Si)。用XRD,SEM和ICP-MS对电解合金及提纯后产物进行表征和含量分析。结果表明:在电解槽电压2.6V、温度850℃的条件下,产物为Ca-Si合金。经过两次区域熔炼提纯后,硅锭85%以上的区域纯度接近99.9999%,符合SG-Si的要求。Ca-Si alloys were prepared in molten CaCl2-LiCl（mole ratio of 9∶1）with high purity silicon dioxide as raw material,high purity graphite and tungsten as electrode by an electrolysis method.The solar grade silicon（SG-Si）was got after the alloys purified by zone melting process.The alloy and purified production were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）and inductively coupled plasma mass spectrometry（ICP-MS）.The results show that electrolysis product is alloy of calcium and silicon at 850℃ when the cathodic voltage is about 2.6V.After twice zone melting process,the purity of silicon of 85%silicon ingot as-prepared is nearly 99.9999%,complying with the standard of SG-Si.

关 键 词：高纯石英粉 熔盐电解 太阳能级硅 区域熔炼 

分 类 号：TF111.522[冶金工程—冶金物理化学]