The recovery of iron from iron sinking slag and lead smelter slag was investigated by desulfurization-reduction bath smelting. The effects of lead smelter slag(LSS) to iron sinking slag(ISS) mass ratio and temperature...The recovery of iron from iron sinking slag and lead smelter slag was investigated by desulfurization-reduction bath smelting. The effects of lead smelter slag(LSS) to iron sinking slag(ISS) mass ratio and temperature were investigated in desulfurization experiments. The X-ray diffraction(XRD) and X-ray fluorescence(XRF) analyses show that the optimum conditions are LSS:ISS of 3:7 and temperature of 1350°C. The composition of desulfurization products is mainly Zn Fe2O4, and the desulfurization rate of 99.66% is obtained under optimum conditions. The thermogravimetric(TG) and differential scanning calorimeter(DSC) analyses demonstrate that reductant is necessary for decomposition and reduction of zinc ferrite in desulfurization product. The effects of reductant, temperature and feeding modes on iron enrichment were investigated in reduction experiments. The scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) determination show that the iron content of reduction product is up to 99.36% under optimum conditions of coke as reductant, reduction temperature of 1450°C and the feeding mode of premixing.展开更多
The blowing and stirring composite process of molten iron desulfurization process affects the desulfurization efficiency and has obvious advantages in improving steel properties and expanding the scale of converter st...The blowing and stirring composite process of molten iron desulfurization process affects the desulfurization efficiency and has obvious advantages in improving steel properties and expanding the scale of converter steelmaking.At present,the injection position of the injection stirring research is fixed,and the desulfurization efficiency needs to be improved.The gas–liquid flow behavior of single-scale bubble model and the size and distribution of bubbles in multi-scale bubble model were studied by computational fluid dynamics numerical simulation method for the injection mixing composite process of jet inlet and stirring paddle rotating at the same speed.The pressure distribution and velocity distribution inside the fluid indicate that the velocity difference between the gas–liquid phases and the turbulence of the liquid are due to the collisions of bubbles,which are due to essential conditions for bubble breaking.Different injection air volumes have essential influence on the formation of single bubbles.When the injection volume reaches 2.8 m3/h,the turbulent kinetic energy is maximum,the bubble formation is rapid,and the desulfurization efficiency can be improved.The multi-bubble results show that the bubble diameter is mainly distributed in the range of 2–5 mm.The higher gas flow rate will increase the number of bubbles in the fluid and promote the bubble refinement process.展开更多
基金Project(2011AA061003)supported by the National High Technology Research and Development Program of China
文摘The recovery of iron from iron sinking slag and lead smelter slag was investigated by desulfurization-reduction bath smelting. The effects of lead smelter slag(LSS) to iron sinking slag(ISS) mass ratio and temperature were investigated in desulfurization experiments. The X-ray diffraction(XRD) and X-ray fluorescence(XRF) analyses show that the optimum conditions are LSS:ISS of 3:7 and temperature of 1350°C. The composition of desulfurization products is mainly Zn Fe2O4, and the desulfurization rate of 99.66% is obtained under optimum conditions. The thermogravimetric(TG) and differential scanning calorimeter(DSC) analyses demonstrate that reductant is necessary for decomposition and reduction of zinc ferrite in desulfurization product. The effects of reductant, temperature and feeding modes on iron enrichment were investigated in reduction experiments. The scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) determination show that the iron content of reduction product is up to 99.36% under optimum conditions of coke as reductant, reduction temperature of 1450°C and the feeding mode of premixing.
基金supported by the National Natural Science Foundation of China(No.51904069)the Fundamental Research Funds for the Central Universities(No.N2223026)the Scientific Research Fund Project of Northeastern University at Qinhuangdao(No.XNY201808).
文摘The blowing and stirring composite process of molten iron desulfurization process affects the desulfurization efficiency and has obvious advantages in improving steel properties and expanding the scale of converter steelmaking.At present,the injection position of the injection stirring research is fixed,and the desulfurization efficiency needs to be improved.The gas–liquid flow behavior of single-scale bubble model and the size and distribution of bubbles in multi-scale bubble model were studied by computational fluid dynamics numerical simulation method for the injection mixing composite process of jet inlet and stirring paddle rotating at the same speed.The pressure distribution and velocity distribution inside the fluid indicate that the velocity difference between the gas–liquid phases and the turbulence of the liquid are due to the collisions of bubbles,which are due to essential conditions for bubble breaking.Different injection air volumes have essential influence on the formation of single bubbles.When the injection volume reaches 2.8 m3/h,the turbulent kinetic energy is maximum,the bubble formation is rapid,and the desulfurization efficiency can be improved.The multi-bubble results show that the bubble diameter is mainly distributed in the range of 2–5 mm.The higher gas flow rate will increase the number of bubbles in the fluid and promote the bubble refinement process.
