压蒸条件下钢渣的碳化过程

Study on Carbonization Process of Steel Slag Under Pressure Steam Conditions

中文关键词: 钢渣碳化水泥 钢渣 二氧化碳 碳化

英文关键词: cement based on carbonized steel slag, steel slag, carbon dioxide, carbonization

中文摘要:

      将钢渣压制成一定形状的试块,分别在60 ℃、90 ℃及120 ℃下采用CO₂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7 d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CaCO₃。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 ℃。

英文摘要:

      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 at 60 ℃, 90 ℃ and 120 ℃ for 7 days, 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 ℃.