Abstract:

To solve the problem of low bottom blowing effect and fast erosion of bottom tuyeres caused by high oxidability of slag during semisteel steelmaking in Pangang Group Xichang Vanadium & Steel Co.，Ltd.，measures such as application of new bottom blowing tuyeres，optimization of bottom tuyeres arrangement and optimization of thermalreplacement scheme were adopted. Bottom blowing effect during the converter campaign was improved. Industrial application indicated that after the optimization of bottom blowing process，mean thermalreplacement time was shorten by 95 min，average phosphor distribution ratio（L_P）between steelslag during the whole converter campaign was improved from  78.0  to  92.5，mean TFe mass fraction in endpoint slag was reduced form 19.7 % to  18.6 %，and average carbonoxygen concentration product at endpoint was reduced from 0.002 8  to 0.002 3. Production efficiency of converter steelmaking was improved and cost of BOF blowing was reduced as well.

Key words: semi-steel steelmaking, numerical simulation, bottom blowing, carbon oxygen equilibrium