New Technology and Magnetic Property of Fast Reducing Roasting for Fine Iron-Bearing Materials

作者：Luo Li-qun^*; Yu Yong-fu; Zhang Jing-sheng

来源：Journal of Iron and Steel Research International, 2009, 16: 485-490.

• iron material
• fast reduction
• reducing roasting
• thermal decomposition
• magnetic separation

The technological features of the,techniques of fast reducing roasting (FRR) and conventional magnetic roasting are briefly described. The test equipment suit able for FRR of fine-grained materials is introduced. The results of tests of low-grade refractory iron ore and the used equipment are introduced. It is the first time that a magnetic roasting process achieves FRR. In a weakly reducing atmosphere and at 740-800 degrees C, refractory powder ferrous material (-0.30 mm) which is rich in specularite, limonite and Mg-Mn siderite was subjected to FRR for a few seconds to one minute. Weakly magnetic iron concentrates with iron grade of 55.67%-55.21% (due to high content of Mg and Mn in the ore) and iron yield of 81.66%-86.57% were used The results of magnetism detection of the material, before and after the FRR, indicated that weakly magnetic material was mainly converted into strongly magnetic material Fe3O4 with specific saturation magnetic moment. It indicates that it is practicable to use the FRR technique to improve the utilization of iron ore resources that are of marginal grade.

• 出版日期2009-10
• 单位武汉理工大学; 长沙矿冶研究院有限责任公司