Study on high efficient desulfurization of new type synthetic refining slag
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摘要: 本文開發了一種預熔型精煉合成渣,具有高堿度低熔點的特性,實驗室條件下,平均脫硫率為84.5%.在工業實驗中,根據鋼種出鋼要求,設計了分鋼種的加料方案.實驗結果表明,本精煉渣可以達到100%出鋼化渣率,精煉時間縮短了11min.與原工業渣系相比,使用本精煉渣后,VD前鋼中氧和氮含量分別降低了7×10-6和12×10-6,VD后鋼中氧和氮含量分別降低了5×10-6和15×10-6.脫硫率也得到了大幅提高,從電爐出鋼至VD后吊包的脫硫率為92%,最低硫含量達到30×10-6.Abstract: One type of premelted refining slag was developed in this article. This new type refining slag has the characteristics of high basicity and low melting point. Under laboratory conditions, the average desulfurization rate reached to 84.5%. During the industrial experiment, the charging schemes of steel grades were distinct. The experimental results indicated that using the new type refining slag the slag-melting rate was 100% at the end of tapping and the refining time was shortened by 11 min. By comparison with original refining slag, oxygen content and nitrogen content in steel reduced respectively by 7×10-6 and 12×10-6 before VD refining and by 5×10-6 and 15×10-6 after VD refining. The desulfurization rate was also increased sharply. The results showed that the desulfurization rate was 92% from EAF tapping to craning ladle of VD, and the lowest sulphur content in steel was 30×10-6.
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Key words:
- synthetic refining slag /
- charging scheme /
- desulfurization /
- industrial experiment
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