Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology

作者：Chen, Dong^*; Zhu, De-qing; Chen, Yao

来源：ISIJ International, 2014, 54(10): 2162-2168.

DOI：10.2355/isijinternational.54.2162

• pyrite cinder
• chloridizing roasting
• reduction roasting
• prereduced pellet
• nonferrous metal removal

Pyrite cinder contains considerable amount of nonferrous metals and the iron grade of pyrite cinder is low for blast furnace burden, so processing the pyrite cinder has become a significant issue for the utilization of valuable resources and environmental protection. In this study, a technique with high temperature chloridizing-reduction roasting is presented in aim to remove nonferrous metals from iron and produce blast furnace burden with high quality. The effects of chloridizing temperature and time, chlorinating agent dosage, reduction temperature and time are investigated. The optimum process parameters are determined as follows: chloridizing at 1125 degrees C for 10 min, CaCl2 dosage of 2% and reduction at 1100 degrees C and the coal/cinder ratio of 2.5 for 40 min. Under these conditions, the compressive strength of prereduced pellets is 1147N per pellet, the metallization degree is 84.53% and the removal rates of Cu, Pb and Zn are 37.87%, 99.31% and 80.20%, respectively.

• 出版日期2014
• 单位中南大学; 苏州大学