Materials Transactions Online

Materials Transactions, Vol.59 No.06 (2018) pp.984-988
© 2018 The Japan Institute of Metals and Materials

Pyrometallurgical Separation of Indium Phosphide through the Phosphorous Removal by Iron and the Chlorination Process Utilizing Ammonium Chloride

Osamu Terakado1, Taishi Matsushita2, Haruki Tani3 and Masahiro Hirasawa3

1Department of Material and Environmental Engineering, National Institute of Technology, Hakodate College, Hakodate 042-8501, Japan
2Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
3Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan

Pyrometallurgical chlorination process has been employed for the recovery of elements from indium phosphide, InP, one of the important III-V semiconductor materials. It was found that both indium and phosphorous were converted to volatile species, indium chloride and phosphine, PH3, by thermal treatment of InP powder in the presence of ammonium chloride. However, the recovery as volatile compounds reached ∼60% at reaction temperature of 800°C. Based on these results we have employed the thermal treatment of the mixture of InP and iron powders. Phosphorous could be successfully converted to non-toxic iron phosphide, Fe3P. The consequent chlorination reaction resulted in the indium recovery of ∼100% in volatile form. The influence of reaction conditions, such as reaction temperature and composition of ammonium chloride, was examined.

[doi:10.2320/matertrans.M2018007]

(Received 2018/01/09; Accepted 2018/03/27; Published 2018/05/25)

Keywords: indium phosphide, recovery, chlorination, ammonium chloride, pretreatment

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