Research On Deep Reduction Of Oolitic Hematite And Separation Of Iron

This paper conducted a series of research for oolitic hematite,which was not used because of difficult to separation and smelting.Raw materials collected from Hezhang in Guizhou province has typical oolitic structure,the iron grade of 51.2%and iron minerals are mainly in the form of Fe₂O₃,others in the form of FeO.Phosphorus in the form of apatite,which gangue minerals are mainly in form of quartz,chlorite and other substances.Hematite and phosphorus gangue minerals disseminated relationship of complex,so the monomer solution is difficult,which the traditional processing method is difficult to achieve effective separation.The effects of ore structure by different heating methods are studied in this paper.By using mineralogical analysis,XRD and chemical analysis,etc testing methods in thermodynamics and materials science,we study that the impact on the deep reduction-magnetic separation index of oolitic hematite with reduction temperature,reduction time,carbon fitting ratio and alkalinity under microwave irradiation.With the study of the effect of oolitic hematite based on conventional and microwave heating method,we can conclude that temperature influences on the changes of oolitic hematite obviously.The warmer it gets,the more seriously the organization of oolitic hematite become damaged.And the damage to oolitic organization caused by microwave heating is much greater than that caused by Conventional heating.When the temperature reaches 1050?by the method of Conventional heat,the organization of oolitic hematite begin to change.And,at 1000?we can observe significant changes under microwave irradiation.The results of reduction test and magnetic separation indicate thatthe weight loss rate of sample shows a rising trendwith the increase of temperature and the extended reduction time,and it increases first and then decreases with the increase of carbon ratio.Also,we can see that the alkalinity has little influence on the rate of weight loss.The metallization rate and the recovery rate would increase with the increase of the reduction temperature,slightly increase with the increasing of reduction time,and reach the maximum when the carbon ratio reaches to 0.95.When alkalinity is 2.0,the metallization rate would reach a maximum value and when alkalinity is 1.5,the recovery rate could reach the maximum value.The result shows that the increase of alkalinity is beneficial to the separation of metal and iron.The results of reduction test that:the impact of various factors of primary and secondary order was reduction temperature,C/O mole ratio,basicity and reduction time.The influence of temperature was of significance,the influence of reduction time,carbon ratio and basicity was not significant.Metallization ratio of oolitic hematite can reach 90.83%under the optimal reaction conditions,the optimal reaction conditions are respectively that temperature 1100?,time is 4 h,C/O mole ratio is0.95,basicity is 2.0.