Reduction mechanisms of pyrite cinder-carbon composite pellets |
| |
Authors: | Zheng-jian Liu Xiang-dong Xing Jian-liang Zhang Ming-ming Cao Ke-xin Jiao Shan Ren |
| |
Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
|
| |
Abstract: | The non-isothermal reduction mechanisms of pyrite cinder-carbon composite pellets were studied at laboratory scale under argon (Ar) atmosphere. The composite pellets as well as the specimens of separate layers containing pyrite cinder and coal were tested. The degree of reduction was measured by mass loss. The microstructures of the reduced composite pellets were characterized by scanning electron microscopy (SEM). It is found that the reduction processes of the composite pellets may be divided into four stages: reduction via CO and H2 from volatiles in coal at 673?C973 K, reduction via H2 and C produced by cracking of hydrocarbon at 973?C1123 K, direct reduction by carbon via gaseous intermediates at 1123?C1323 K, and direct reduction by carbon at above 1323 K. Corresponding to the four stages, the apparent activation energies (E) for the reduction of the composite pellets are 86.26, 78.54, 72.01, and 203.65 kJ·mol?1, respectively. |
| |
Keywords: | |
本文献已被 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载免费的PDF全文 |
|