80t多功能单嘴真空精炼炉脱硫冶金特性

Desulphurization behavior of an 80 t multifunctional single snorkel vacuum refining furnace

为了开发多功能单嘴真空精炼炉的脱硫工艺,在80 t RH基础上改造的80 t多功能单嘴真空精炼炉进行了37炉次的冶炼超低碳超低硫钢种的脱硫试验。试验结果表明:多功能单嘴真空精炼炉具有较好的脱硫效果,最高脱硫率可达到81.2%,钢液中最低w(S)可降低至10×10-6。研究了脱硫操作过程中脱硫剂、脱氧剂加入量及钢包渣厚对80 t多功能单嘴真空精炼炉脱硫效果的的影响。推荐的多功能单嘴真空精炼炉较优的脱硫工艺参数为:CaO-CaF2渣系的脱硫剂中石灰和萤石加入量分别为5.0～6.0和3.0～3.5 kg/t,脱氧剂金属铝的加入量为5.0kg/t。虽然钢包内渣厚对多功能单嘴真空精炼炉钢液终点硫含量及脱硫率没有明显影响,但为了发挥多功能单嘴真空精炼炉的其他精炼效果应严格控制来自转炉的渣厚。

To develop the reasonable desulfurization operation parameters of the multi- functional single snorkel vacuum refining furnace, 37 heats desulfurization tests have been carried out to refine ultra-low carbon and sulfur steel in an 80 ton multifunctional single snorkel vacuum refining furnace at No. 2 Steelmaking Plant, Shanxi Taigang Stainless Steel Company Limited. The desulfurization results show that the maximum desulfurization ratio of 81.2 % can be achieved, while the lowest sulfur content of mol- ten steel maintains at the level of 10 × 10^-6. The influences of some basic operation pa- rameters, such as mass of added lime and fluorite as desulfurizer, mass of added metal aluminum as deoxidizer and thickness of topslag in the ladle, on desulphurization rate have been analyzed and discussed. The recommended operation parameters of the 80 ton multifunctional single snorkel vacuum refining furnace with ideal desulfurization ability are summarized as follows, the ideal mass of the added lime and fluorite as desulfurizer is 5.0~6. 0 and 3. 0~3. 5 kg/t, while the reasonable metal aluminum as deoxidizer is 5.0 kg/t. Although the thickness of top slag in the ladle has no obvious effect on the fi-nal sulfur content and desulfurization rate, the thickness of top slag in the ladle should be strictly controlled as thin as possible because thicker top siag in the ladle has negative effect on other functions, such as decarburization and degassing of the developed multi- functional single snorkel vacuum refining furnace.