Magnetic Roasting of Hematite-Limonite by Microwave Heating
Hematite-limonite (HL) is one of typical low-grade iron ores, which has characteristics of low-grade, complex components and difficult for beneficiation. Traditional magnetic roasting (MR) for HLpellets can easily lead to cold center and over reduction of the surface, even fayalite or other compounds will appear in the process of MR, which adds great difficult for the separation of iron minerals and gangues. Anovel method of MR by microwave radiation can heat the center and surface of pellets simultaneously and give priority to heat coal particles and iron minerals which will accelerate the transformation of HL to magnetite while gangues remain lower temperature due to their weak absorbing microwave capacity, thus the formation of fayalite or other compounds is greatly restrained. The result indicated that, under the conditions of coal-containing HL pellets of 350g, microwave energy of 1.5KW, the temperature of the sample could reach to 800℃ at 35min, followed the size of grinding<0.074mm 81.68% , and magnetic field intensity of 1.52×105A/m, the iron grade and recovery up to 61.15% and 88.35% respectively.
hematite-limonite microwave heating magnetic roasting magnetic separation (MS)
HU Bing HUANG Zhu-cheng JIANG Tao WANG Xia ZHANG Yuan-bo
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China
国际会议
The 5th International Congress on the Science and Technology of Ironmaking(第五届国际炼铁科技大会 ICSTI09)
上海
英文
494-498
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）