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铁水炉外处理尽管能够得到相当高的脱S和脱P率,但是由于使用脱S剂和脱P剂量大以及进行处理需要耗时,所以引起铁水温度下降,给转炉操作带来困难,同时经过脱硫处理的铁水又有可能要“回硫”。日本新日铁八幡厂发明了一种在转炉内吹炼超低硫钢的方法,其把吹炼过程分成2个阶段:在第1阶段当铁水含碳量降至0.3％～2.5％时,加入脱S剂进行脱S处理,然后把脱S渣扒除。在第2阶段,加入脱P剂进行吹氧冶炼,最后得到成分合乎规定的钢水。第一阶段铁水含碳量不能大于2.5％,否则脱碳量不够,温度上升不多,不能得到促进脱S反应的效
Although the hot metal outside the furnace can get a very high off and de-P rate, but due to the use of desulfurization and de-P dose is large and the processing takes time, so the temperature of hot metal caused by the converter operation to bring difficulties, while passing Desulfurization of molten iron may have to “back to sulfur.” Japan Nippon Steel Yawata plant invented a method of blowing ultra-low sulfur steel in the converter, which blows the process is divided into two stages: in the first phase when the carbon content of molten iron dropped to 0.3% to 2.5% Add S agent off the S treatment, and then remove the S slag Pa addition. In the second stage, add P agent for oxygen blowing smelting, and finally get the composition of the required molten steel. The first phase of hot metal carbon content can not be greater than 2.5%, or decarburization is not enough, the temperature rise is small, can not get the effect of off S reaction