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Metal Mine ›› 2019, Vol. 48 ›› Issue (02): 38-43.

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Study on Iron Phase Transformation and Magnetic Transformation during Suspension Magnetization Roasting of Specularite

Li Jia1,2, Sun Yongsheng1,2, Li Yanjun1,2, Han Yuexin1,2   

  1. 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. National-Local Joint Engineering Research Center of Refractory Iron Ore Resources Efficient Utilization Technology,Shenyang 110819, China
  • Online:2019-02-25 Published:2019-04-08

Abstract: The main valuable element of a specularite ore in Gansu Province is iron. The content of TFe is 59.61%. 94.79% of the iron in the raw ore exists in the form of hematite and limonite. The gangue mineral is mainly quartz and the content is 8.11%. In order to investigate the effect of main factors on phase transformation and magnetic transformation of roasted products, suspension roasting experiments were carried out. The results show that after the suspension magnetization roasting of specularite, the roasted product iron mainly exists in the form of magnetite, and the magnetism is obviously enhanced. With the increase of roasting temperature, roasting time, CO concentration and total gas volume, the content of specularite in roasted products decreases gradually, the content of magnetite increases gradually, and the saturation magnetization and maximum specific magnetization coefficient of roasted products increase first and then decrease. The specific saturation magnetization of the roasted product is 63.66 A·m2/kg and the maximum specific magnetization coefficient is 5.02×10-4 m3/kg when the roasting temperature is 550 ℃ and the roasting time is 4 min, the concentration of CO is 20% and the total gas volume is 600 mL/min. The iron phase in the roasting process changes in the order of Fe2O3→Fe3O4→FeO. The transformation of the phase of the roasted product will affect the magnetic strength, and is mainly related to the content of magnetite. The experimental results can provide theoretical basis for the mechanism of suspension roasting of specularite resources in China.

Key words: Specularite, Suspension magnetization roasting, Phase transformation, Magnetism transformation