1. 1) M. Y. Zhu, J. A. Zhou, S. S. Pan and J. Sha: Technology and Device for Bottom Powder Injection through Slot Brick in Ladle, Chinese Patent CN200510047980.1, (2006).
2. 2) M. Y. Zhu and Z. F. Chen: A Device for Bottom Powder Injection through Plunge-slot and Anti-blocking Brick in Ladle, Chinese Patent CN201110234797.8, (2013).
3. 3) M. Y. Zhu, Z. F. Chen and W. T. Lou: A Device for RH Vacuum Refining with Bottom Powder Injection, Chinese Patent CN201210012782.1, (2014).
4. 4) M. Y. Zhu, Z. F. Chen and W. T. Lou: A Device and Method for Vacuum Degassing Refining of Molten Steel with Bottom Powder Injection, Chinese Patent CN201310207525.8, (2014).
5. 5) Z. F. Chen and M. Y. Zhu: Metall. Mater. Trans. B, 45B (2014), 1695.