Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology
Preparation of Prereduced Pellets by Pyrite Cinder Containing Nonferrous Metals with High Temperature Chloridizing-reduction Roasting Technology
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DOI：
10.2355/isijinternational.54.2162
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发表时间：
2014-10
影响因子：
1.8
通讯作者：
D. Chen;De‐qing Zhu;Yao Chen
中科院分区：
文献类型：
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作者：
D. Chen;De‐qing Zhu;Yao Chen
硫铁矿石中含有大量的有色金属，其铁品位较低，无法满足高炉冶炼的要求，因此硫铁矿石的处理已成为资源利用和环境保护的重要课题。本文提出了一种高温氯化还原焙烧工艺，旨在脱除铁中的有色金属，生产出高质量的高炉炉料。考察了氯化温度、氯化时间、氯化剂用量、还原温度、还原时间等因素对氯化效果的影响。最佳工艺参数确定如下：在1125 °C氯化10 min，CaCl 2用量2%，1100 °C还原40 min，煤煤比2.5的条件下，预还原球团的抗压强度为1147 N/个，金属化率为84.53%，Cu，Pb、Zn含量分别为37.87%、99.31%和80.20%。
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 1 125°C for 10 min, CaCl2 dosage of 2% and reduction at 1 100°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.