Technicial Research of Converter Duplex Melting Process with Low Hot Metal Ratio

Abstract

The present paper discusses the technical characteristics of the converter duplex melting process(MURC), develop one special converter duplex melting process with low hot metal ratio to meet the actual producing condition of Fujian Sangang steel group. Research show, how to promote the melting of lime during dephosphorizing period is the key step for MURC process. Adjusting the charging amount of lime according to the w([Si]) content in hot metal is helpful to control the melting of lime and the slag basicity. Under the condition of low hot metal ratio, in dephosphorizing period, must raise the melting temperature referring to the conventional process, lower the target slag basicity and w(T.Fe)suitably. According to results of the special MURC process industrial experiments, this process can meet the requirements on the producing of high-performance steel. Average tapping w([C]) is 0.183%, w([P]) is 0.0183%. The average dephosphorization rate is more than 90%. At the same time, referring to the conventional process, the special MURC process save the consumption of steel material about 2.3kg/tand save the consumption of lime 11.2kg/t averagely.