Production practice of dolomite used as slag-pressing agent in converter steelmaking
In order to solve the technical problems in the existing technology,such as the serious degree of slag foa-ming at the end point of converter blowing,which affects the safety of steelmaking equipment and operators,the in-crease of converter steel consumption and the extension of smelting cycle,raw dolomite is used as slag pressing a-gent for endothermic decomposition,and a large amount of CO2 gas is generated by reaction,which increases the gas nucleation center in steel and reduces the formation pressure of CO bubbles.Under the auxiliary stirring of ni-trogen purging,it is beneficial to the discharge of CO gas in slag in a short time,so as to achieve the purpose of rapid defoaming.In addition,CaO and MgO produced by thermal decomposition of dolomite are high melting point substances,which reduce the temperature of slag,improve the basicity,viscosity and melting point of slag,im-prove the dephosphorization condition and slag splashing effect,and reduce the erosion rate of furnace lining.Com-pared with the non-dolomite slag defoaming method,the converter pour time is shortened by 36.67％,the slag splashing time is shortened by 60 s,and the erosion rate of the furnace lining at the trunnion and bottom is reduced by about 0.11 mm/furnace,which provides a guarantee for the high-efficiency smelting production of the convert-er.
raw dolomiteslag pressure agentfoaming slagliquid steel compositionslag composition
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