氧化铝对铬质引流砂烧结行为的影响

Effect of alumina addition on sintering behavior of chromite-based ladle filler sands

为了揭示氧化铝颗粒在常规铬质引流砂烧结过程中的作用,通过实验室试验研究了不同氧化铝含量对引流砂烧结行为的影响。研究发现,在有无钢液作用下,氧化铝颗粒对常规铬质引流砂烧结的影响趋势基本一致。当添加的质量分数较少时(如不大于5%),氧化铝颗粒不仅不能起到抑制烧结的作用,反而有利于引流砂烧结;当添加质量分数超过一定值后(如不小于10%),氧化铝才有抑制烧结的作用。在常规铝镇静钢生产中,常规铬质引流砂可以获得很好的使用效果,因而不建议在铬质引流砂中额外添加氧化铝颗粒。钢液会显著加速引流砂的烧结,采用氧化铝来抑制高锰高铝钢对引流砂的作用切实可行,但需要足够高的氧化铝含量才能达到效果,后续还有待进一步研究。

In order to understand the effect of alumina grains on the sintering of conventional chromite-based ladle filler sands,laboratory experiments were carried out using the ladle filler sands with different alumina contents.It is found that the influential trends of alumina on the sintering of the sands are very similar,no matter whether liquid steel is employed.When the mass fraction addition of alumina is very low(e.g.no more than 5%),alumina grains will not inhibit,but enhance the sintering of sands.With the increase of alumina content,a weaker sintering result can be found when its mass fraction is sufficiently high(e.g.no less than 10%).Conventional chromite-based ladle filler sands can obtain a good ladle free-opening rate during the practice of conventional Al-killed steel grades,therefore extra alumina addition in the sands is not recommended.Liquid steel would evidently accelerate the sintering of sands,and alumina grains are proved to be practical to constrain the effect of high Mn-high Al steel on the sintering of sands.However,the large amount of alumina should be taken into account,and further studies are still needed.