Abstract:In order to achieve the purpose of energy saving and consumption reduction, the recycling process test of ladle hot casting residual slag was carried out in the converter and KR. The slag forming and metallurgical effects before and after the recycling of ladle hot casting residual slag in the converter and KR were compared and analyzed. The results showed that, without modification of the existing equipment, adding about 30 kg/t ladle hot casting residual slag in each conventional furnace could save 12 kg/t of iron and steel material, 4.31 kg/t of lime, 4.87 kg/t of sinter and 1.83 m3/t of oxygen, shortened the smelting time by 3.24 min for per furnace, saved the smelting cost of 39.43 yuan/t steel, reduced the end-point a[O] content, improved the end-point dephosphorization rate, and improved the molten steel quality and smelting efficiency, while reduced the cost of steelmaking. The environmental pollution caused by the discharge of ladle casting residual slag was also reduced, and the economic and social benefits were good. In order to reduce the influence of high sulfur content in ladle casting residual slag on converter metallurgical effect, the ladle hot casting residual slag could be recycled by returning to KR hot metal pretreatment, about 27 kg/t ladle hot casting residual slag was added to each hot metal tank, the amount of desulfurizer such as lime was reduced by 82.2%, the hot metal pretreatment time was shortened by 1 min, the temperature drop was reduced by 4 ℃, the rephosphorization rate was reduced by 2%, and the desulfurization rate was 69.4%, and good results were achieved.
孟华栋, 杨勇, 姚同路. 转炉及KR循环利用钢包热态铸余渣工艺试验[J]. 中国冶金, 2022, 32(7): 107-113.
MENG Hua-dong, YANG Yong, YAO Tong-lu. Process test of recycling ladle hot casting residual slag in converter and KR[J]. China Metallurgy, 2022, 32(7): 107-113.