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| Effect of CaO on enhancement reduction of oolitic hematite by H2 |
| ZHANG Fan1,2，HUANG Run1,2，LI Ming-ming1,2，[LU]Xiao-dong1,2，ZHANG Jin-zhu1,2 |
（1. School of Materials and Metallurgy， Guizhou University， Guiyang 550025， Guizhou， China
2. Laboratory Metallurgical Engineering and Energy Saving Process of Guizhou Province， Guiyang 550025， Guizhou， China） |
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Abstract The reduction of the high phosphorus oolitichematite played an important role in subsequent magnetic separation. To provide theoretical basis for the rational utilization and development of oolitic hematite. The high phosphorus oolitic hematite was used as the raw material， H2 was the reducing agent. The effect of adding CaO in the reduction of highphosphorus oolitic hematite was studied. The results showed that when the temperature was 1 100 ℃ and the alkalinity was 1.0，the metallization rate was 92.05%. The XRD， SEM-EDS analysis showed that adding CaO makes most of the iron oxides reduced to metal iron， and the CaO effectively promoted the reduction of fayalite （Fe2SiO4） and spinel （FeAl2O4） into iron and the reduction of impurity components of metallic iron particles. The kinetic calculation results showed that the ore was in correspondence with the nuclear reaction model at 800-1 100 ℃. The apparent activation energy of ore was 49.16 kJ/mol and that of adding CaO ore is 56.46 kJ/mol. Both the two reduction processes are controlled by gas diffusion.
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Received: 22 May 2018
Published: 20 November 2018
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2018, Vol. 53 
