Influence of microwave radiation on phosphorus-removal process of oolitic high-phosphorus iron ore fines
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Abstract:
Influence of microwave radiation on newly proposed phosphorus removal process(gaseous reduction and slag/metal separation) is studied. Microwave radiation on the ore fines is carried out using MW-HS multi-function high temperature microwave reactor. The treated ore fines are subjected to examinations of SEM, EDS and TG. TG tests are conducted using thermal analyzer(LINSEIS STA PT 1600). Results show that microwave pretreatment can obviously change the microstructure of the ore fine. After microwave pretreatment, arc cracks develop along the boundaries between phosphorite phase and hematite phase and loose zones in the areas where multi-minerals coexist. Microwave pretreatment has an intesification effect in the late stage of the gaseous reduction of the ore fines. Results of gaseous reduction and melt separation tests indicate microwave pretreatment could greatly improve the metal recovery rate in processing the ore fines using the proposed phosphorus removal method while phosphorus content in the metal sample is slightly increased. Under the condtion that the reduction temperture is 1 273 K, reduction atmosphere full CO and reduction time 2 hours, metallization rate of the sample pretreated using microwave power of 450 W could reach 90%. And in the melting separation process, its metal recovery rate reaches 83% with a phosphorus content of 0.48%(mass percent) in the metal sample.
