Lime injection system for electric arc furnace steelmaking
In modern electric arc furnace steelmaking, the quality of slag is the key cornerstone of the smelting process. The pace and intensity of steelmaking are faster and higher than ever before. As the power on time is shortened to 30 minutes or even shorter, adding the appropriate amount of slagging agent at the appropriate time is crucial for rapid slagging during the smelting process. The foam slag can protect the water-cooled furnace wall from the influence of high strength arc heat radiation, guide the heat to the molten pool, improve the impedance, increase the active power, and protect the refractory from overheating and chemical erosion. All these factors are key points in improving the production efficiency of electric arc furnaces, which helps to control the smelting cost of electric arc furnaces to achieve optimal results. The demand for slag making agent pneumatic injection systems in EAF electric arc furnaces is increasing day by day, thanks to several technological improvements: improvements in the reliability of the conveying system, more efficient injection equipment, and the emergence of specific quality slag making agent products. The lime and dolomite spraying technology has been proven to be the most effective method for controlling slag alkalinity and viscosity, and now this technology has been widely recognized by electric arc furnace smelters. After adopting the pneumatic injection system, the chemical composition information of slag can be more accurately integrated into a closed-loop control logic, which can better obtain slag analysis data. Through model calculation, it can adapt and adjust slag formation early. Accordingly, with the electric arc furnace smelting, more ideal foam slag conditions and MgO saturation can be adjusted and obtained, making the submerged arc better, increasing the stability of electric energy input, significantly improving the heat input efficiency and improving the refractory life, and ultimately optimizing the comprehensive cost of smelting.
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