*Tatsuya MISAWA¹, Yuji KAWAKAMI², Masakazu KAWAHARA³ (1. Saga University(Japan), 2. Kurume National Collage of Technology(Japan), 3. Kawahara SPS Technical Office(Japan))

*Yuya MAEDA¹, Tatsuya MISAWA¹, Kenichi SUNAMOTO² (1. Saga University(Japan), 2. Akane Co., Ltd.(Japan))

*Thato Sharon TSHEPHE¹, Peter OLUBAMBI², Kenneth OZOEMENA³, Iakovos SIGALAS⁴ (1. Department of Metallurgical Engineering, University of Johannesburg, Johannesburg 2006(South Africa), 2. Department of Chemical Engineering, University of Johannesburg, Johannesburg 2006(South Africa), 3. School of Chemistry, University of the Witwatersrand, Wits 2050(South Africa), 4. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Wits 2050(South Africa))