1. MOE Key Laboratory of New Processing Technology for Norferrous Metals and Materials Guangxi key Laboratory of Processing for Norferrous Featured Metals and Materials School of Resources, Environment and Materials Guangxi University Nanning Guangxi 530004 P. R. China
2. School of Chemical Engineering and Technology Hainan University Haikou 570228 P. R. China
3. School of Chemical and Environmental Engineering Shaoguan University Shaoguan 512005 P. R. China
4. College of Civil Engineering & Architecture Guangxi University Nanning 530004 P. R. China