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Since the oxygen binding ability is much greater than silicon and phosphorus and oxygen binding capacity , the preferential oxidation of silicon , phosphorus , and the generated SiO2 will greatly reduce the basicity . Desilication first pre- processing before consumption in order to reduce dephosphorizer improve efficiency dephosphorizing must be dephosphorizing hot metal pretreatment . In this paper, Hubei Province and Wuhan high-phosphorus iron ore production practice , under laboratory conditions , to study the desilication agent components , desilication dosage, reaction temperature, treatment time, stirring intensity and impact of the initial silicon content desilication efficiency and high phosphorus desiliconized desilication thermodynamics and process temperature drop problem is studied . The results showed that : ( 1 ) alkalinity is less than 0.8, with the alkalinity increases, the rate of increase desilication , manganese removal rate decreased ; alkalinity greater than 0.8, alkalinity increases, the rate of removal of silicon decreased. If we consider suppression foam slag alkalinity control in 0.6 is reasonable. ( 2 ) lower reaction temperature not only help to improve the rate of removal of silicon , but also help inhibit the formation of foaming slag and reduction of carbon , manganese losses. After calculation and analysis, found that the end of the same silicon content lower reaction temperature , the lower the equilibrium oxygen activity ; reaction temperature is the same , the lower end higher silicon content equilibrium oxygen activity ; ( 3 ) increasing the rate of oxidant excess coefficient rose desilication high . In order to save costs, reduce the temperature drop and control foaming slag , excess oxidant factor in 30% of control more reasonable ; ( 4 ) desilication reaction speed quickly, within a temperature range of 1350 ℃ ~ 1500 ℃ , 5min reaction basically completed ; ( 5 ) stirring intensity increases, the rate of removal of silicon increases, but also conducive to generating foaming slag ; ( 6 ) the initial silicon content is low , but the end desilication lower rate and lower silicon content ; initial silicon At higher levels , desilication higher rate of over 90 %, but the end of the silicon content is higher . ( 7 ) by adjusting the solid and gaseous oxygen ratio of oxygen to enhance thermal insulation, reduce processing time and strictly control the amount desilication agent , able to process iron desilication temperature drop within a reasonable range.
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