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考察和分析了钢液RH喷粉脱硫过程及机理，探讨了该过程的速率.基于双重阻力传质理论和体系内的质量衡算，建立了RH喷粉脱硫动力学模型，确定了模型各有关参数，包括各传质系数和钢液内参与脱硫反应的粉量等.以该模型对300tRH装置内设定的不同初始硫含量和喷粉量下喷吹石灰基粉剂脱硫作了计算和模拟，相应的钢液环流量和喷粉速率分别取为100t／min和150kg／min；设定的初始硫含量（质量分数，10－4％）和喷粉量分别为70，60，50，40，30；20和10，8，6，5，4，3kg／t—steel对每种工况计算了8个循环，整个脱硫处理时间为24min．结果表明，由该模型所作的估计与一些工业性数据相当吻合；在（60—80）×10-4％的初始硫含量下，喷吹3—5kg／t—steel石灰基粉剂（85％CaO＋15％CaF2）,总处理时间12—20min，有可能使钢液硫含量达到（5—10）×10－4％以下水平；强化喷粉操作，增大钢液环流量可有效提高RH喷粉脱硫的速率
The desulfurization process and mechanism of RH dusting in liquid steel were investigated and analyzed.The rate of this process was discussed.The kinetics model of RH dusting desulfurization was established based on double resistance mass transfer theory and mass balance in the system, Parameters including the mass transfer coefficient and the amount of powder in the molten steel for the desulfurization reaction, etc. The model was used to calculate and simulate the desulfurization of lime-based powder sprayed by different initial sulfur content and the amount of dust set in the 300tRH unit, The corresponding molten steel circulation and dusting rate were taken as 100t / min and 150kg / min; the initial sulfur content (mass fraction, 10-4%) and the amount of dusting were 70,60,50,40, 30; 20 and 10, 8, 6, 5, 4, 3kg / t-steel calculated for each working condition 8 cycles, the entire desulfurization treatment time of 24min. The results show that the estimates made by this model are in good agreement with a few industrial data; spraying 3-5 kg / t-steel lime-based powder (85% CaO + 15 at an initial sulfur content of (60-80) x 10-4% % CaF2), the total processing time is 12-20min, it is possible to make the liquid sulfur content (5-10) × 10-4% below the level; strengthen the dusting operation, increase the liquid steel circulation can effectively improve RH dusting desulfurization s speed