Continuous circulating smelting process based on multi-refining converter melting technology

Continuous circulating smelting experiments based on multi-refining converter melting technology were performed to research the recycling of decarburized slag in the dephosphorization period. The results show that under the condition of low Fe O content,strong mixing,blowing for about 5 min and[C] ≥ 2.8% in the dephosphorization stage,the content of phosphorus in molten metal is less than 0.025%. With the continuous circulating smelting,the consumption of lime decreases from 65 kg·t^-1 to 31 kg·t^-1,the[P] content drops from 0.018% to 0.005%,and the smelting reaches equilibrium after 2-4 furnaces. During the smelting process,60-80 kg slag per ton steel is poured out at the end of the dephosphorization period,while 120-130 kg remaining slag per ton steel is poured out at the end of the loop. The average mass of slag is about 83 kg per ton steel,more less than 120 kg per ton steel in the ordinary process.