End-point optimization model of Jingtang dephosphorization furnace based on material cost control

In order to increase the accuracy of the end control of the duplex process,the production cost is reduced.Based on material balance and thermal balance as the theoretical basis,combined with Jingtang production data,application of C#software to design the joining and cost calculation model of duplex process materials.Through the model analysis,under the conditions of certain molten iron and molten steel,the effect of changing the C content,temperature and P content of the dephosphorization furnace(Dep-BOF)on the addition amount and cost of lime,dolomite,ore and heating agent in the whole double process.The results show that changes in the end temperature and composition have an effect on the amount of the above-mentioned materials.The amount of the heating agent has the most significant influence on the cost of the materials.Therefore,the heating agent should be minimized when meeting the end-point requirements of the decarburization furnace(Dec-BOF)and the amount of scrap steel.When Dep-BOF end-point w([P])and the temperature are constant,the higher Dep-BOF end-point w([C]),the lower the auxiliary material cost.So in the Dep-BOF should be as little as possible decarbonize to 3.635%,the lowest cost of materials.When the Dep-BOF end-point w([C])and w([P])are unchanged,the lower the Dep-BOF end-temperature is better,but when the temperature is lower than 1 333°C,due to the addition of Dec-BOF heating agent,the cost increased significantly.When the end-point w([C])and temperature of the Dep-BOF are constant,the Dec-BOF low-temperature conditions should be utilized to remove as much phosphorus as possible.Under the existing technological conditions,when the end-point w([P])from 0.029%to 0.033%,the cost of materials is the lowest.