It is shown by the the law of mass action in combination with the coexistence theory of slag structure that KMn n =NMno /(NFeo [%Mn] does not change with basicities and maintains constant at constant temperature; the...It is shown by the the law of mass action in combination with the coexistence theory of slag structure that KMn n =NMno /(NFeo [%Mn] does not change with basicities and maintains constant at constant temperature; the oxidizing capabilities of multicomponent slag systems containing CaO, MgO etc., can be expressed by NFe tO =NFeO + 6NFe2 O3 + 8NFe3O4; the desulfurizing capabilities of various basic oxides for multicomponent slag systems can be calculated by Ls=8(KCaSNCaO+KMgsNMgo +KFeSNFeO)∑n/[%O]; the dephosphorizing capabili- ties of CaO-MgO-FeO-FeO O3-P2 O5 as well as CaO-FeO-Fe2 O3-A12 O3-P2 O5 molten slags expressed respectively by Lpo=(%P2O5)/[P]2 = 141.94[%O]5∑nK00(1 + K5N2Cao + K6N3CaO + K7N4CaO + K8N2MgO + K9N3MgO + K10N3FeO + K11N4Feo); LPO=(%P2O5)/[P]2= 141.94[%O]5∑nK00(1 + K10N2CaO+ K11N3CaO+ K12N4CaO + K13N3FeO + K14N4FeO) have good agreement with practical values.展开更多
It is found that strong basic oxides including Li 2O, Na 2O, K 2O and BaO, which are used to replace a part of CaO in CaO based fluxes, can lower the melting point and the viscosity and enhance the dephosphorizing...It is found that strong basic oxides including Li 2O, Na 2O, K 2O and BaO, which are used to replace a part of CaO in CaO based fluxes, can lower the melting point and the viscosity and enhance the dephosphorizing ability. The mechanism was analysed and the addition of Li 2O to CaO based fluxes was recommended.展开更多
It is found that strong basic oxides including Li2O,Na2O,K2O and BaO,which are used to replace a part of CaO in CaO-based fluxes,can lower the melting point and the viscosity and enhance the dephosphorizing ability. T...It is found that strong basic oxides including Li2O,Na2O,K2O and BaO,which are used to replace a part of CaO in CaO-based fluxes,can lower the melting point and the viscosity and enhance the dephosphorizing ability. The mechanism was analysed and the addition of Li2O to CaO based fluxes was recommended.展开更多
In order to meet the requirements for environmental protection and achieve sustainable development for the steel industry, Baosteel＇ s secondary resources should be utilized in production. Hot metal dephosphorizing f...In order to meet the requirements for environmental protection and achieve sustainable development for the steel industry, Baosteel＇ s secondary resources should be utilized in production. Hot metal dephosphorizing factors are analyzed and the practice of a dephosphorizing agent for molten iron pretreatment with LT dust and BOF slag is introduced. Experimental results show that LT dust and BOF slag can be substituted for traditional raw materials, such as sinter and quicklime, etc in molten iron dephosphorization. The proper addition of LT dust or BOF slag and the proper control over basic agents, oxidizing agents and fluxes can achieve the same effect as traditional dephosphorizing agents. BaO can reduce the activity of P2O5 and form stable dephosphorizing products. Using a BaO dephosphorizing agent as a kind of harmless dephosphorizing agent will be one of the trends of molten iron dephosphorization.展开更多
文摘It is shown by the the law of mass action in combination with the coexistence theory of slag structure that KMn n =NMno /(NFeo [%Mn] does not change with basicities and maintains constant at constant temperature; the oxidizing capabilities of multicomponent slag systems containing CaO, MgO etc., can be expressed by NFe tO =NFeO + 6NFe2 O3 + 8NFe3O4; the desulfurizing capabilities of various basic oxides for multicomponent slag systems can be calculated by Ls=8(KCaSNCaO+KMgsNMgo +KFeSNFeO)∑n/[%O]; the dephosphorizing capabili- ties of CaO-MgO-FeO-FeO O3-P2 O5 as well as CaO-FeO-Fe2 O3-A12 O3-P2 O5 molten slags expressed respectively by Lpo=(%P2O5)/[P]2 = 141.94[%O]5∑nK00(1 + K5N2Cao + K6N3CaO + K7N4CaO + K8N2MgO + K9N3MgO + K10N3FeO + K11N4Feo); LPO=(%P2O5)/[P]2= 141.94[%O]5∑nK00(1 + K10N2CaO+ K11N3CaO+ K12N4CaO + K13N3FeO + K14N4FeO) have good agreement with practical values.
基金the support of Wong K C Education Foundation , Hong Kong
文摘It is found that strong basic oxides including Li 2O, Na 2O, K 2O and BaO, which are used to replace a part of CaO in CaO based fluxes, can lower the melting point and the viscosity and enhance the dephosphorizing ability. The mechanism was analysed and the addition of Li 2O to CaO based fluxes was recommended.
基金Item Sponsored by National Natural Science Foundation of China(59774015)
文摘It is found that strong basic oxides including Li2O,Na2O,K2O and BaO,which are used to replace a part of CaO in CaO-based fluxes,can lower the melting point and the viscosity and enhance the dephosphorizing ability. The mechanism was analysed and the addition of Li2O to CaO based fluxes was recommended.
文摘In order to meet the requirements for environmental protection and achieve sustainable development for the steel industry, Baosteel＇ s secondary resources should be utilized in production. Hot metal dephosphorizing factors are analyzed and the practice of a dephosphorizing agent for molten iron pretreatment with LT dust and BOF slag is introduced. Experimental results show that LT dust and BOF slag can be substituted for traditional raw materials, such as sinter and quicklime, etc in molten iron dephosphorization. The proper addition of LT dust or BOF slag and the proper control over basic agents, oxidizing agents and fluxes can achieve the same effect as traditional dephosphorizing agents. BaO can reduce the activity of P2O5 and form stable dephosphorizing products. Using a BaO dephosphorizing agent as a kind of harmless dephosphorizing agent will be one of the trends of molten iron dephosphorization.
