A kinetic model on hot metal desulfurization with mechanical stirring was established using FactSage Macro Processing. The sulfur diffusion in the molten steel and reactions at the interface between the molten steel and the desulfurizer particle were considered. Calculated results agreed well with experimental results, indicating that the model can be used to predict the desulfurization rate and cost with various temperatures, chemical compositions, rotation speeds, and desulfurizer additions. The higher impeller rotation speed from 80 to 120 r/min, higher temperature from 1573 to 1673 K, smaller particle size from 2.5 to 1.5 μm, and more desulfurizer addition from 0.35 to 0.64 kg/t were suggested to improve the desulfurization rate. Moreover, to synthetically increase the desulfurization efficiency and lower the cost, contours of S content and cost during the desulfurization process with various desulfurizer additions and time were calculated. Based on industrial cost data analysis of the added desulfurizer, the refractory erosion, and electric power consumption, the total cost of the hot metal desulfurization with time step (Δt) was fitted as \({\text{Cost}}_{{{\text{total}}}} = 0.0{66} + {1}.{58} \times {1}0^{{ - {7}}} \cdot \Delta t\). The less desulfurizer addition and longer desulfurization time contributed to lowering the cost, while more desulfurizer addition was conducive to improving the desulfurization efficiency.

使用 FactSage Macro Processing 建立了机械搅拌铁水脱硫的动力学模型。考虑了硫在钢水中的扩散和钢水与脱硫剂颗粒界面的反应。计算结果与实验结果吻合较好，表明该模型可用于预测不同温度、化学成分、转速和脱硫剂添加量的脱硫率和脱硫成本。建议叶轮转速从 80 到 120 r/min，温度从 1573 到 1673 K，粒径从 2.5 到 1.5 μm，脱硫剂添加量从 0.35 到 0.64 kg/t，以提高脱硫率。此外，为了综合提高脱硫效率和降低成本，计算了不同脱硫剂添加量和时间的脱硫过程中硫含量和成本的等值线。基于投加脱硫剂、耐火材料侵蚀、电耗的工业成本数据分析，铁水脱硫总成本随时间步长（Δt ) 拟合为\({\text{Cost}}_{{{\text{total}}}} = 0.0{66} + {1}.{58} \times {1}0^{{ - { 7}}} \cdot \Delta t\)。脱硫剂添加量少、脱硫时间长有利于降低成本，而脱硫剂添加量多有利于提高脱硫效率。