压蒸条件下钢渣的碳化过程

Study on Carbonization Process of Steel Slag Under Pressure Steam Conditions

将钢渣压制成一定形状的试块,分别在60℃、90℃及120℃下采用CO_2对试块进行了碳化处理。对碳化后试块的质量、体积、抗压强度的变化进行了测试。采用X射线能谱仪(XRD)、热重-差热分析仪(TG-DSC)分析了碳化过程中的物相变化。用扫描电子显微镜(SEM)观察了碳化后产物的微观形貌。研究结果表明,在60℃、90℃、120℃碳化温度下碳化7d后,试块的质量分别增加15.30%、17.48%、23.84%;试块的体积分别增加5.9%、6.5%、11.44%;试块的抗压强度分别达到32.87 MPa、39.62 MPa、42.38 MPa。钢渣碳化后产物主要为CaCO_3。从碳化后试块的力学强度和节能两方面综合考虑,碳化的最佳温度为90℃。

Steel slag was pressed into pellets with a certain shape,and then they were carbonized using CO2 at temperature 60 ℃,90 ℃ and 120 ℃ respectively.Change of mass,volume and mechanical strength after carbonization were tested.Structural changes of steel slag during carbonization were characterized with XRD and TG-DSC.Morphologies of the carbonized steel slag were characterized with SEM.The results indicated that after carbonized at60℃,90℃and 120℃for 7days,the mass of steel slag increased by 15.30%,17.48%and 23.84%;the volume of steel slag increased by 5.9%,6.5% and 11.44%;and the mechanical strength of steel slag increased to 32.87 MPa,39.62 MPa and 42.38 MPa,respectively.The main phase of carbonized steel slag was CaCO3.Considering mechanical strength and energy saving,the optimum carbonization temperature for steel slag was 90 ℃.