The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out.For pre-treatment of hot metal,both desulphurization and dephos...The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out.For pre-treatment of hot metal,both desulphurization and dephosphorization are improved with the increase of CaO in slag,but deteriorated with the increase of CaF2 in slag.The average desulphurization and dephosphorization rate is 68.83 % and 78.46 %,respectively.For molten steel,the substitution of BaO for CaO in slag has minor effect on simultaneous desulphurization and dephosphorization.The desulphurization and dephosphorization rate is higher than 90% and 50% respectively with the lowest final sulfur and phosphorus mass percent being 0.001 2% and 0.010%,respectively.The overall effect of simultaneous desulphurization and dephosphorization of molten steel is better than that of hot metal.展开更多
A kinetic model on hot metal desulfurization with mechanical stirring was established using FactSage Macro Processing.The sulfur diffusion in the molten steel and reactions at the interface between the molten steel an...A kinetic model on hot metal desulfurization with mechanical stirring was established using FactSage Macro Processing.The sulfur diffusion in the molten steel and reactions at the interface between the molten steel and the desulfurizer particle were considered.Calculated results agreed well with experimental results,indicating that the model can be used to predict the desulfurization rate and cost with various temperatures,chemical compositions,rotation speeds,and desulfurizer additions.The higher impeller rotation speed from 80 to 120 r/min,higher temperature from 1573 to 1673 K,smaller particle size from 2.5 to 1.5μm,and more desulfurizer addition from 0.35 to 0.64 kg/t were suggested to improve the desulfurization rate.Moreover,to synthetically increase the desulfurization efficiency and lower the cost,contours of S content and cost during the desulfurization process with various desulfurizer additions and time were calculated.Based on industrial cost data analysis of the added desulfurizer,the refractory erosion,and electric power consumption,the total cost of the hot metal desulfurization with time step(Δt)was fitted as Cost_(total)=0.066+1.58×10^(−7)·Δt.The less desulfurizer addition and longer desulfurization time contributed to lowering the cost,while more desulfurizer addition was conducive to improving the desulfurization efficiency.展开更多
基金Sponsored by Provincial Natural Science Foundation of Anhui of China
文摘The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out.For pre-treatment of hot metal,both desulphurization and dephosphorization are improved with the increase of CaO in slag,but deteriorated with the increase of CaF2 in slag.The average desulphurization and dephosphorization rate is 68.83 % and 78.46 %,respectively.For molten steel,the substitution of BaO for CaO in slag has minor effect on simultaneous desulphurization and dephosphorization.The desulphurization and dephosphorization rate is higher than 90% and 50% respectively with the lowest final sulfur and phosphorus mass percent being 0.001 2% and 0.010%,respectively.The overall effect of simultaneous desulphurization and dephosphorization of molten steel is better than that of hot metal.
基金support from the National Science Foundation China(Grant Nos.U1860206,51725402)the S&T Program of Hebei(Grant No.20311005D,20591001D)the High Steel Center(HSC)at Yanshan University,and Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials(ICSM)and the High Quality Steel Consortium(HQSC)at University of Science and Technology Beijing(USTB),China.
文摘A kinetic model on hot metal desulfurization with mechanical stirring was established using FactSage Macro Processing.The sulfur diffusion in the molten steel and reactions at the interface between the molten steel and the desulfurizer particle were considered.Calculated results agreed well with experimental results,indicating that the model can be used to predict the desulfurization rate and cost with various temperatures,chemical compositions,rotation speeds,and desulfurizer additions.The higher impeller rotation speed from 80 to 120 r/min,higher temperature from 1573 to 1673 K,smaller particle size from 2.5 to 1.5μm,and more desulfurizer addition from 0.35 to 0.64 kg/t were suggested to improve the desulfurization rate.Moreover,to synthetically increase the desulfurization efficiency and lower the cost,contours of S content and cost during the desulfurization process with various desulfurizer additions and time were calculated.Based on industrial cost data analysis of the added desulfurizer,the refractory erosion,and electric power consumption,the total cost of the hot metal desulfurization with time step(Δt)was fitted as Cost_(total)=0.066+1.58×10^(−7)·Δt.The less desulfurizer addition and longer desulfurization time contributed to lowering the cost,while more desulfurizer addition was conducive to improving the desulfurization efficiency.
