Desulphurization Of High Phosphorus Hot Metaland Numerical Study

The basic goal of desulfurization in iron pretreatment is to remove sulfur content of hotmetal that will enter the converter to the finished product level.This iron pretreatment technologycan help liberate blast furnace production capacity and reduce the burden of desulfurization inblast furnace, and lay a foundation for the production of high quality steel. This paper discusses theCaF2/CaO ratio, initial sulfur content and stirring time on the pretreatment of hot metaldesulphurization effect. The conclusions are as follows:(1) CaF2/CaO ratios in the range of0.1~0.15is benefit to the hot metal desulphurization, too little or too much is not good;(2) thedesulfurization rate is high when initial sulfur content is high, the desulfurization rate can reach93.48%;(3) the existence of an optimal mixing time, mixing time too short will make thedesulfurization rate is not high, but stir for a long time to improve the desulphurization ratebasically does not work, the appropriate mixing time is about6min.KR mixing method and injection method is the most representative of the pretreatment ofhot metal desulphurization, both are stirred molten iron, prompted the desulfurizing agent andmolten iron mixing. prompted the desulfurizing agent and hot metal mixing to desulfurizationpurposes. So improving the stirring energy, strengthening the desulfurization reaction, willdirectly affect the desulfurization production. Therefore, This paper applied Fluent software, tosteel ladle mechanical agitation desulfurization actual simulated, get the flow field status andgeometric parameters of the device in scope.In the paper，multi-reference frame(MRF) is used to simulate the blades The standard k-εmodel is used to simulate actual ladle, discusses its blade width selection, agitator in liquid ironinsert depth range and stirrer speed on molten iron flow effects. The conclusions are as follows:The selection on the blades of the width is found that relative to the short leaf blade, leafblade can achieve better stirring energy, makes the molten iron flow more fully.The discussion of the insertion depth of shows that a certain range can achieve bettermixing effect, inserted too deep or too shallow will have a bad effect. Depth too shallow maycause the molten iron splash, too deep for molten iron ladle bottom scour is too big, it willinfluence the stirring head life expectancy. The insertion depth will be controled about800mmunder the liquid surface.The study of rotating speed is found that blade speed increased to80rpm, stirring paddlebeneath the iron liquid flow rate has been improved obviously, low-speed area reduced; bladespeed is higher than that of120rpm, the flow rate of liquid iron slants big, may cause the molteniron splash, to equipment damage. The blade speed to80~120rpm is appropriate.