1. 2) J. Pan, D.-Q. Zhu, Y. Cui, D. Chen and X.-L. Zhou: J. Central South Univ. (Science and Technology), 42 (2011), 1495 (in Chinese).
2. 3) C. Li: China Steel, (2011), 11 (in Chinese).
3. 4) W.-M. Song: Iron Steel, 34 (1999), 66 (in Chinese).
4. 5) X. Gao: Sintering Pelletizing, 33 (2008), 1 (in Chinese).
5. 7) M. Zandi, M. Martinez-Pacheco and T. A. T. Fray: Miner. Eng., 23 (2010), 1139.