Desulfurization of Hot Metal by the Injection of High-Quality Lime Powder

Resumo

The desulfurization of hot metal by the injection of fluidized lime (≥94% CaO) is analyzed, when the lime consumption is 0.5–19 kg/t of hot metal. That results in 95% desulfurization; the lowest sulfur content in the hot metal is 0.003%. Decrease in sulfur content in the hot metal to 0.005, 0.010, 0.015, 0.020, and 0.025% with different initial sulfur content is observed, with the injection of different quantities of lime. Sulfur content below 0.001% is not observed and not guaranteed. Recommendations are made for optimal desulfurization of hot metal by lime. Their adoption increases the desulfurization, decreases the losses of hot metal and the temperature, and decreases the consumption of materials and the cost of the process.