Preparation of pre-reduced pellet using pyrite cinder containingnonferrous metals with high temperature chloridizing-reduction roasting technology—Effect of CaCl2 additive
来源期刊：中南大学学报(英文版)2015年第11期
论文作者：CHEN Dong ZHU De-qing HONG Lan CHEN Yao XU Ji-fang WU Ling
文章页码：4154 - 4161
Key words：pyrite cinder; CaCl2 additive; pelletizing; chloridising; reduction
Abstract: The role of CaCl2 during the high temperature chloridizing-reduction roasting process was investigated, aiming at acquiring high strength blast furnace burden with high iron grade and low nonferrous metals content.The effects of CaCl2 dosage on pelletizing, preheating and reduction were investigated. The results show that CaCl2 can improve the wet drop strength but reduces the thermostability of pyrite cinder green balls. When the dosage of CaCl2 exceeds 1%, the compressive strength of preheated pellets decreases while the growth of iron oxide particles is improved. Furthermore, the compressive strength of pre-reduced pellets increases but the metallization degree of pre-reduced pellets decreases with CaCl2 additive. The removal tests indicate that Zn can be removed completely without CaCl2 additive, Cu is removed only under the condition with CaCl2 additive and part of Pb must be removed by CaCl2 additive.
CHEN Dong(陈栋)1, ZHU De-qing(朱德庆)2, HONG Lan(洪澜)1, CHEN Yao(陈瑶)3, XU Ji-fang(许继芳)1, WU Ling(伍凌)1
(1. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
3. School of Mechanical and Electric Engineering, Soochow University, Suzhou 215021, China)
Abstract:The role of CaCl2 during the high temperature chloridizing-reduction roasting process was investigated, aiming at acquiring high strength blast furnace burden with high iron grade and low nonferrous metals content.The effects of CaCl2 dosage on pelletizing, preheating and reduction were investigated. The results show that CaCl2 can improve the wet drop strength but reduces the thermostability of pyrite cinder green balls. When the dosage of CaCl2 exceeds 1%, the compressive strength of preheated pellets decreases while the growth of iron oxide particles is improved. Furthermore, the compressive strength of pre-reduced pellets increases but the metallization degree of pre-reduced pellets decreases with CaCl2 additive. The removal tests indicate that Zn can be removed completely without CaCl2 additive, Cu is removed only under the condition with CaCl2 additive and part of Pb must be removed by CaCl2 additive.
Key words:pyrite cinder; CaCl2 additive; pelletizing; chloridising; reduction
