Abstract
With a view to preparing high purity Si from crude Si, Mg or Cu alloying process was studied as an improvement of the Al-alloying process(1) proposed by I. Obinata and N. Komatsu. In Mg-alloying method, Mg-Al-Si alloy has been used to prepare the anode in the electrolysis because of the difficulty of preparing Mg and Si alloy. In Cu alloying method, besides the electrolytic treatment, an acid-leaching dissolution method has been also studied. The results of spectroscopic analysis of various Si purified by these alloying methods are shown in Table 1. Purified Si obtained by Cu-alloying process shows higher purity than those by Al or Mg alloying process. We consider that in the purification process, Al or Mg remains as oxides in purified Si, while Cu oxide is removed easily by acid treatment.
