利用含金属钙硅铁合金进行钢液硅合金化和钙处理的方法,属于钢铁冶金精炼领域。在转炉冶炼后的出钢过程中不进行或进行部分硅合金化,同时进行钢液铝脱氧处理和加渣预精炼,并且将铝含量按钢种要求上限控制。二次精炼后向钢液中加入含金属钙的硅铁合金进行硅合金化和钙处理,之后先采用较大流量吹氩搅拌1～3分钟以促进合金熔化,然后再进行低流量吹氩搅拌以均匀钢液成分和促进夹杂物改性及上浮。本发明利用硅铁合金中含有的金属钙,通过调整硅合金化时机来同时实现钢液硅合金化和钙处理的目标,减少甚至取消了常规的喂钙线操作,降低了生产成本；同时避免了喂钙线带来的钢液喷溅问题,减少了钢液的增氧增氮,提高了操作稳定性和钙的收得率,进而也提升了钢液洁净度。

The invention relates to a method for silicon alloying and calcium treatment of liquid steel by using ferrosilicon alloy containing metal calcium, which belongs to the field of iron and steel metallurgy and refining. In the tapping process after converter smelting, there is no silicon alloying or partial silicon alloying. At the same time, liquid steel aluminum deoxidation treatment and slag pre-refining are carried out, and the aluminum content is controlled according to the upper limit of steel grade requirements. After secondary refining, ferrosilicon alloy containing metal calcium is added to the liquid steel for silicon alloying and calcium treatment. Then, argon blowing and stirring with large flow rate for 1 ~ 3 minutes are used to promote alloy melting, and then argon blowing and stirring with low flow rate are carried out to homogenize the composition of liquid steel and promote inclusion modification and floating up. The invention utilizes the metal calcium contained in the ferrosilicon alloy to realize the goals of silicon alloying and calcium treatment of liquid steel at the same time by adjusting the silicon alloying time, reduces or even cancels the conventional calcium feeding line operation and reduces the production cost; At the same time, the splashing problem of liquid steel caused by calcium feeding line is avoided, the oxygen and nitrogen increase of liquid steel is reduced, the operation stability and calcium yield are improved, and then the cleanliness of liquid steel is improved.