Characterization and technology of fast reducing roasting for fine iron materials

Luo, Li-qun, Huang, Hong and Yu, Yong-fu (2012) Characterization and technology of fast reducing roasting for fine iron materials. Journal of Central South University, 19 8: 2272-2278. doi:10.1007/s11771-012-1271-3

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Author Luo, Li-qun
Huang, Hong
Yu, Yong-fu
Title Characterization and technology of fast reducing roasting for fine iron materials
Journal name Journal of Central South University   Check publisher's open access policy
ISSN 2095-2899
2227-5223
Publication date 2012-08
Sub-type Article (original research)
DOI 10.1007/s11771-012-1271-3
Volume 19
Issue 8
Start page 2272
End page 2278
Total pages 7
Place of publication Changsha, China
Publisher Zhongnan Daxue
Collection year 2013
Language eng
Formatted abstract
The features of the techniques of fast reducing roasting (FRR) and conventional magnetic roasting, as well as tremendous demands of iron ores in iron and steel industry of China, were briefly described. The test equipment suitable for FRR of fine-grained materials was introduced. Weakly magnetic materials with grain size of <0.30 mm were converted into strongly magnetic materials by FRR for several to dozens of seconds. In a weakly reducing atmosphere and at 740–800 °C, refractory powder iron material (<0.30 mm) which is rich in specularite, limonite and Mg-Mn siderite was subjected to FRR for a few seconds to 60 s. Concentrate with iron grade of 55.67%–55.21%, high contents of Mg and Mn in the ore is obtained and the yield of magnetic separation reaches 81.66%–86.57%. The results of X-ray diffraction (XRD) analysis and magnetism detection of the material before and after FRR indicate that weakly magnetic material is mainly converted into strongly magnetic material Fe3O4 with specific saturation magnetic moment. The efficiency of FRR is consistent with TFe recovery of magnetic separation; meantime, the specific saturation magnetic moment increases from 33 to 42 times after FRR. Calculations show that speeds of flash magnetic roasting are obtained from several dozen to two or three hundred times, compared with rotary kiln or shaft furnace. This indicates that it is practicable to use the fast reducing roasting technique to improve the comprehensive utilization of iron ore resources.
Keyword Iron material
Reducing roasting
Thermal decomposition
X-ray diffraction
Magnetic property
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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Created: Sun, 16 Sep 2012, 00:05:38 EST by System User on behalf of School of Chemical Engineering