二元炉渣碱度对微晶铸石析晶行为及抗折强度的影响  

Effect of alkalinity of binary slag on crystallization behavior and flexural strength of microcrystalline cast stone

作　　者：王晨 王艺慈[1] 吕智智 柴轶凡 罗果萍[1] 常宏涛[1] 曹旭 WANG Chen;WANG Yi-ci;LÜZhi-zhi;CHAI Yi-fan;LUO Guo-ping;CHANG Hong-tao;CAO Xu(College of Rare Earth Industry,Inner Mongolia University of Science and Technology(College of Rare Earth Engineering Technology),Baotou 014010,China;Inner Mongolia Baotou Iron and Steel Co Ltd,Ironmaking Plant,Baotou 014010,China)

机构地区：[1]内蒙古科技大学稀土产业学院(稀土工程技术学院),内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司炼铁厂,内蒙古包头014010

出　　处：《材料热处理学报》2025年第1期199-205,共7页Transactions of Materials and Heat Treatment

基　　金：“固废资源化”国家重点研发计划项目(2020YFC1909105);内蒙古自治区高等学校科学研究目(NJZZ23056);内蒙古自治区直属高校基本科研项目(2023XKJX002)。

摘　　要：研究了二元碱度对微晶铸石晶化行为及抗折强度的影响。在Facts age热力学计算的基础上,借助扫描电镜(SEM)和X射线衍射仪(XRD)对微晶铸石的析晶行为和显微结构进行了分析。结果表明:高炉渣碱度在0.90~1.20时,微晶铸石的主晶相为钙铝黄长石和镁黄长石,析晶温度应控制在1100℃以下;炉渣碱度为0.96时,可以获得晶粒分布较为均匀、致密的显微结构;随着碱度的提高,微晶铸石抗折强度呈现先升高后降低的趋势,碱度为0.96时抗折强度达到峰值,为40.08 MPa,当碱度超过0.96时,晶界面积逐渐变小机械强度降低,碱度1.20时抗折强度仅有3 MPa。Effect of binary alkalinity on crystallization behavior and flexural strength of microcrystalline cast stones was studied.Based on the thermodynamic calculations of Facts age,the crystallization behavior and microstructure of the microcrystalline cast stones were analyzed using scanning electron microscopy(SEM)and X-ray diffraction(XRD).The results show that when the alkalinity of blast furnace slag is between 0.90 and 1.20,the main crystal phases of the microcrystalline cast stone are calcium aluminum yellow feldspar and magnesium yellow feldspar,and the crystallization temperature should be controlled below 1100℃.When the alkalinity of slag is 0.96,the microstructure with relatively uniform and dense grain distribution can be obtained.As the alkalinity increases,the flexural strength of the microcrystalline cast stones shows a trend of first increasing and then decreasing.When the alkalinity is 0.96,the flexural strength reaches its peak value of 40.08 MPa.When the alkalinity exceeds 0.96,the grain boundary area gradually decreases,and the mechanical strength decreases.When the alkalinity is 1.20,the flexural strength is only 3 MPa.

关 键 词：高炉渣 碱度 微晶铸石 析晶 抗折强度 

分 类 号：TD926.4[矿业工程—选矿]