Abstract:In order to achieve less slag of "Full- Tri- De" smelting process and reduce the material consumption of supplementary materials, the new technology of directly recycling the hot desulfurization slag, the hot decarburization slag and the residual slag and steel after casting was developed in Shougang Jingtang. The recyclability of hot steel and slag of "Full- Tri- De" smelting process was analyzed, and the application effects were verified by the commercial test. The results showed that the desulfurization agent consumption, the temperature drop of hot metal and the temperature drop of hot metal can be reduced by 30%- 40%, 10- 15 ℃ and 30%- 40%, respectively, through recycling of 5 t desulfurization slag. At the same time, the iron loss and the environmental pollution can be reduced. And the average consumption of 3.2 t lime was saved through recycling hot steel slag 20 t per ladle. If the silicon mass fraction in molten iron was lower than 0.15%, lime could not be added to dephosphorization furnace. The consumption of 2.4 kg/t iron and steel raw material was correspondingly cut. Meanwhile, light- burned dolomite and fluorite as burden materials were eliminated in dephosphorization furnace, Thus, it can realize the zero consumption of supplementary materials in dephosphorization furnace. According to the residual in ladle after casting, through controlling the blast furnace tapping and putting the hot refining slag produced in the RH/LF/CAS process and the residual slag and steel in ladle after casting into the semisteel ladle, which was used in the smelting in decarburization furnace, the time of recycling casting residual slag and steel can reach 6- 8 times and may achieve the direct recovery of liquid casting.
刘延强,罗磊,张鹏,王皓,袁天祥,张丙龙. 首钢京唐热态渣、钢绿色循环利用体系开发[J]. 中国冶金, 2018, 28(6): 25-31.
LIU Yan- qiang,LUO Lei,ZHANG Peng,WANG Hao,YUAN Tian- xiang,ZHANG Bing- long. Development of green recycling system of hot slag and molten steel at Shougang Jingtang[J]. China Metallurgy, 2018, 28(6): 25-31.