The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF_2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF_2 slags was tested. The phosphate capacity of t...The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF_2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF_2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 10^(18.03) to 10^(19.11) with an activity coefficient of P_2O_5 ranging from 10^(-19.47) to 10^(-18.09). The effect of BaO content, initial phosphorus content and oxygen potential of molten steel on dephosphorization was discussed. The phosphorus pick-up by the BaO-based slags was studied.展开更多
A new heat flux coefficient model and improved refreshing rules were introduced for optimizing coiling temperature model. The off-line simulation of the new strategy was performed by laminar cooling intelligent softwa...A new heat flux coefficient model and improved refreshing rules were introduced for optimizing coiling temperature model. The off-line simulation of the new strategy was performed by laminar cooling intelligent software, and the on-line application shows that the control of coiling temperature has been improved significantly.展开更多
As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 1...As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 10 min. The effect of Cr 2O 3/FeO mass ratio in pellets on chromium content in hot metal and the yield of chromium were investigated. The results indicated that the highest chromium content is in hot metal produced from South African UG2 ore, but slag volume produced with Indian chromite is the smallest. The yield of chromium is only 60% to 75%, due to short melting time, high melting point and large surface tension of the slag with high Al 2O 3 and MgO content, which influences the separation between metal and slag.展开更多
文摘The molten steel was dephosphorized by high basic BaO-based slags (BaO-CaO-CaF_2) to achieve ultra low phosphorus level. The dephosphorization ability of the BaO-CaO-CaF_2 slags was tested. The phosphate capacity of this slag system at 1 620 ℃ varied from 10^(18.03) to 10^(19.11) with an activity coefficient of P_2O_5 ranging from 10^(-19.47) to 10^(-18.09). The effect of BaO content, initial phosphorus content and oxygen potential of molten steel on dephosphorization was discussed. The phosphorus pick-up by the BaO-based slags was studied.
文摘A new heat flux coefficient model and improved refreshing rules were introduced for optimizing coiling temperature model. The off-line simulation of the new strategy was performed by laminar cooling intelligent software, and the on-line application shows that the control of coiling temperature has been improved significantly.
文摘As the raw material for hot metal containing chromium from 20% to 40%, carbon-beared chromite pellets made from three kinds of typical chromite were reduced at 1 300 ℃ for 30 min and then kept at 1 550-1 600 ℃ for 10 min. The effect of Cr 2O 3/FeO mass ratio in pellets on chromium content in hot metal and the yield of chromium were investigated. The results indicated that the highest chromium content is in hot metal produced from South African UG2 ore, but slag volume produced with Indian chromite is the smallest. The yield of chromium is only 60% to 75%, due to short melting time, high melting point and large surface tension of the slag with high Al 2O 3 and MgO content, which influences the separation between metal and slag.
