不锈钢AOD渣固化效果影响因素及其机理  

Curing influence factors and mechanism of stainless steel slag in AOD

作　　者：许莹 张孜孜 王变 胡晨光 王欢欢 

机构地区：[1]河北省无机非金属重点实验室,河北唐山063009 [2]华北理工大学材料科学与工程学院,河北唐山063009

出　　处：《钢铁》2017年第8期43-47,80,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(51574109)

摘　　要：不锈钢氩氧脱碳(AOD)渣在冷却过程中易发生体积膨胀导致粉化扬尘,这不仅会对环境造成严重污染,给人体带来很大危害,还会造成资源的浪费,因此急需解决不锈钢渣的粉化扬尘问题,提高不锈钢渣的利用率。对不同改性剂对渣的粉化抑制效果进行研究,结果表明,随着B_2O_3和P_2O_5掺量的增加,对AOD渣有明显的固化效果,随着CuO的增加,AOD渣没有明显固化。分析原因表明,通过向不锈钢渣中添加半径比Si^(4+)小的离子如B^(3+)、P^(5+),可以使其在2CaO·SiO_2的晶界或位错上富集,降低缺陷的自由能,降低γ-2CaO·SiO_2成核的驱动力,抑制γ-2CaO·SiO_2晶核的形成及长大,使2CaO·SiO_2可以更好地稳定在β相,从而抑制了不锈钢渣的粉化扬尘。The volume expansion of stainless steel argon oxygen decarburization （AOD） residue during the cooling pro- cess will cause efflorescence and dusting problem, which not only caused serious pollution to the environment, brought great harm to the human body, but also caused a waste of resources, therefore, it needs to reduce the efflorescence prob- lem of stainless steel slag and to improve the utilization rate of stainless steel slag urgently. In the current study, the in- hibitory effect of AOD stainless steel slag was studied by adding different modifiers. The result shows that both of the curing effect and curing rate are gradually increased with the increase of added content of B203 and P205, while the AOD slag has no obvious curing effect when adding CuO as modifier. Analyzing the reason of curing effect, it shows that add- ed ions can be enriched on the grain boundary and dislocation of 2CaO·SiO2 when the radius of added ions is smaller than that of Si^4＋ such as B^3＋ and p^5＋, and this enrichment will reduce the defect free energy and the driving force to form Y- 2CaO. SiO2. It also can inhibit the crystal nucleation and growth of 7- 2CaO. SiO2. All of these effects can make 2CaO. SiO~ stabilized in the 13 phase, thereby inhibitin~ the dust of stainless steel slag.

关 键 词：不锈钢氩氧脱碳(AOD)渣 粉化 改性剂 固化效果 

分 类 号：TF764.1[冶金工程—钢铁冶金]