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| Intensive reduction of high phosphorus oolitic hematite by borax |
| LI Ming-ming1,2，HUANG Run1,2，ZHONG Zheng1,2，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 oolitic hematite ore was recognized as one of the most difficult iron ores to use because of its unique oolitic structure， fine iron particle size， and high phosphorus content. The reduction of high phosphorus oolitic hematite played an important role in subsequent magnetic separation， especially the accumulation and growth of iron. The influence of borax on the reduction of high phosphorus oolitic hematite was studied. It indicates that the weight loss rate is up to 31.11% and the metallization rate is up to 90.10% when the temperature is 1 000 ℃ and the borax percentage is 6%. XRD and SEM analyses show that borax could decrease the melting point of the reactant.On the other hand，the diffraction peaks of fayalite （Fe2SiO4）， ferrospinel （FeAl2O4） and kyanite （Al2SiO5）disappear， and then the ones of anorthite （CaAl2Si2O8） ， sodium aluminum borate（Na2Al2B2O7） and sodium borate （Na2B6O10） with low melting points appear. In the end， the amount and particle size of iron in the reduced samples increase with the addition of borax increasing.It indicates that the effect of reduction is strengthened.
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Received: 06 June 2017
Published: 16 March 2018
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2018, Vol. 53 
