Study on Process of Microwave Magnetizing Roast for Low-Grade Hematite


Article Preview

The microwave magnetic roasting process of low-grade hematite under low temperature was studied experimentally. The effects of roasting temperature, carbon content and roasting time on the reduction and magnetic separation were investigated. It shows that the best percent reduction is 10.96%(near to theoretical value 11.11%)which can be obtained under the condition of roasting temperature of 650°С , carbon content of 1.0% and roasting time of 10 minute. The results of magnetic separation show that the best magnetic separation grade for the sintered ore occurs at 570 instead of 650°С owing to the sintering of ore powders at high temperature of 650°С . Further ball-milling and magnetic separation of this concentrate produces two kind of final concentrate, one of which is in grade 65.6% with the recovery being 45.3%, and the other is in grade 63.4% with the recovery being 62.6%. After the magnetic separation, concentrate ore meets the iron-smelting requirements because of its low S and P content and high grade. This magnetic process results in the enrichment of RE and Nb in tailing ore, which can be reused for the extraction of Rare Earth and Nb.



Advanced Materials Research (Volumes 201-203)

Edited by:

Daoguo Yang, Tianlong Gu, Huaiying Zhou, Jianmin Zeng and Zhengyi Jiang




J. Li et al., "Study on Process of Microwave Magnetizing Roast for Low-Grade Hematite", Advanced Materials Research, Vols. 201-203, pp. 1816-1820, 2011

Online since:

February 2011




[1] Mourao M B, Carvalho I P, Takano C. ISIJ International, 2001, 41 (Supplement): S27-S30.

[2] Jin Chen, LIU Liu, Jia-qing Zeng, etc. Journal of Chinese Electron Microscopy Society, 2005, 24(2): 114-119. (In Chinese).

[3] Meng-yang Huang, Jin-hui Peng, Ming Huang, etc. The Chinese Journal of Nonferrous Metals, 2007, 17(3): 476-480. (In Chinese).

[4] Standish N, Huang W. ISIJ International, 1991, 31(3): 241-245.

[5] De-qing Zhu, Jian Li , Qing-chun Li, etc. The Chinese Journal of Nonferrous Metals, 2007, 17(4): 649-656. (In Chinese).

[6] Guo-hua Gong , Yong-fu Yu, Ying- bo Zhu. Metal Mine(Supplementary Issue), 2003(8): 116-117. (In Chinese).

[7] Jie Li, Bang-wen Zhang, Bao-wei Li. Metal World(spec), 2008(6): 277-280, 295. (In Chinese).

[8] Song, S; Lu, S; Lopez-Valdivieso,A. Minerals Engineering (UK). Vo l. 15, No. 6, June 2002: 415-422.

[9] Quast,K B. Minerals Engineering (UK). Vo l. 13, No. 13, Nov. 2000: 1361-1376.

[10] Han-jie Guo. Metallurgical physical chemistry tutorial[M]. Beijing: Metallurgical Industry Press, 2004. (In Chinese).