寶鋼曾先后采用了混鐵車（CaO系、CaC2系脫硫劑）和鐵水包（Mg系脫硫劑）兩種脫硫方式。當鐵水原始硫為150～300ppm時，脫硫后鐵水硫含量可達10～30ppm的水平。眾所周知，轉爐的脫硫能力是相當有限的。特別在鐵水原始硫含量很低的情況下，由于入爐的石灰、廢鋼等爐料帶有較高的硫，往往出現轉爐過程回硫現象。一般來說，僅靠鐵水預處理要穩定生產硫含量小于30ppm的鋼是有困難的。在轉爐出鋼后對鋼水進行爐外脫硫勢在必行。
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0191418074 SPACING SLEEVE
0191496114 WEDGE
0191561114 INSULATING WASHER
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但在一定條件下，脫硫率隨著噴吹速度的增加而升高。在一定的噴吹條件下，盡管噴吹速度的增加幅度相同，脫硫率的升高幅度并不相同。噴吹速度增加，單位時間內噴吹量增加，鎂粉在鐵水中的分散性不好，脫硫反應不充分。依靠提高噴吹速度來提高脫硫率不是的方法。噴吹速度過高，降低了鎂粉的利用率，噴吹速度太低，雖然能提高鎂粉的利用率，但噴吹時間延長；溫降大、生產率低，工藝上也是不可取的。所以，合適的噴吹速度既能提高鎂粉的利用率，又不至于使脫硫時間過長。
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