Optimization Performance of Slag in High‐Proportion Flux Pelletizing Blast Furnace

High‐pellet‐ratio smelting is regarded as an important pathway for green blast furnace ironmaking, offering significant potential for reducing raw material consumption and carbon emissions. However, variations in slag properties under high pellet ratios exert a pronounced influence on process stability and hot metal quality. In this study, typical pellet SiO 2 contents (3.2–4.2 wt%) and pellet proportions (30–50 wt%) were investigated to quantitatively evaluate the effects of slag amount and composition on the comprehensive metallurgical performance of blast furnace slag. The results show that increasing the pellet ratio from 30 to 50 wt% reduces slag generation by ≈15%. Pellets with a SiO 2 content of 3.6 wt% provide a balanced control of slag quantity and viscosity. As slag basicity increases from 1.10 to 1.30, the sulfur partition ratio rises from 12.8 to 24.7, significantly enhancing desulfurization performance under high‐pellet conditions. Increasing the MgO content to 10 wt% reduces slag temperature fluctuations to 64°C, while further increasing the slag amount to 330 kg/t suppresses temperature variation to within 10°C. From an engineering perspective, maintaining slag basicity at 1.10–1.15 with an MgO content of 8–9 wt% effectively stabilizes slag fluidity and enhances thermal buffering capacity under high‐pellet‐ratio operation. When the pellet proportion is increased to 50 wt%, the theoretical blast furnace fuel rate decreases by 25 kg/t, corresponding to an annual carbon emission reduction of 146,000 t. These findings provide both theoretical insights and industrial guidance for low‐carbon, high‐efficiency blast furnace smelting with high pellet ratios.