By technological experiments on bottom pulverized coal injection in a 10 t converter,the metallurgical reaction of continuous coal-oxygen injected into molten steel was studied.An assumption of direct burning of coal ...By technological experiments on bottom pulverized coal injection in a 10 t converter,the metallurgical reaction of continuous coal-oxygen injected into molten steel was studied.An assumption of direct burning of coal in molten steel is proposed and the result that low carbon steel can also be produced with coal injection is explained.The formulae for decarburization of melting bath were given.The apparent desulphurization rate constant is measured and activation energy of dephosphorization calculated.The influence of coal injection on nitrogen pick-up is studied too.展开更多
The steel slag in the decarburization converter is treated by the little water-spreading （ LWS ） and the heat-stewed （ HS ） methods , which is used as the furnace burden of the dephosphorization converter.The slag...The steel slag in the decarburization converter is treated by the little water-spreading （ LWS ） and the heat-stewed （ HS ） methods , which is used as the furnace burden of the dephosphorization converter.The slag characteristics by the LWS and the HS methods and its application effects as the furnace burden are researched.The results show the moisture content in the HS slag is higher than that of the LWS slag.There is higher total iron content in the HS and the LWS slags and almost same melting point.The dicalcium silicate content in the LWS slag is higher than that in the HS slag.The tricalcium silicate in the LWS slag is lower than that in the HS slag.There are a lot of calcium ferrite in the LWS and the HS slags , which is beneficial to dephosphorization and slag melting.The LWS and the HS slags are added to dephosphorization converter each charge by 3or 6t.The results show that the saving lime is 0.7-1.0tfor each charge.The petrographic constitute of final slag for the dephosphorization converter by adding the LWS and the HS slags is dicalcium silicate , RO phase and glass phase.There are a little calcium ferrite phase in the LWS slag , which is helpful to dephosphorization.So there are better dephosphorization effects for the LWS and HS slags.展开更多
文摘By technological experiments on bottom pulverized coal injection in a 10 t converter,the metallurgical reaction of continuous coal-oxygen injected into molten steel was studied.An assumption of direct burning of coal in molten steel is proposed and the result that low carbon steel can also be produced with coal injection is explained.The formulae for decarburization of melting bath were given.The apparent desulphurization rate constant is measured and activation energy of dephosphorization calculated.The influence of coal injection on nitrogen pick-up is studied too.
基金Item Sponsored by National Key Technology Research and Development Program in 11th Five-Year Plan of China ( 2006BAE03A00 )
文摘The steel slag in the decarburization converter is treated by the little water-spreading （ LWS ） and the heat-stewed （ HS ） methods , which is used as the furnace burden of the dephosphorization converter.The slag characteristics by the LWS and the HS methods and its application effects as the furnace burden are researched.The results show the moisture content in the HS slag is higher than that of the LWS slag.There is higher total iron content in the HS and the LWS slags and almost same melting point.The dicalcium silicate content in the LWS slag is higher than that in the HS slag.The tricalcium silicate in the LWS slag is lower than that in the HS slag.There are a lot of calcium ferrite in the LWS and the HS slags , which is beneficial to dephosphorization and slag melting.The LWS and the HS slags are added to dephosphorization converter each charge by 3or 6t.The results show that the saving lime is 0.7-1.0tfor each charge.The petrographic constitute of final slag for the dephosphorization converter by adding the LWS and the HS slags is dicalcium silicate , RO phase and glass phase.There are a little calcium ferrite phase in the LWS slag , which is helpful to dephosphorization.So there are better dephosphorization effects for the LWS and HS slags.
