利用加速碳化技术激发钢渣活性研究

Study on Stimulation of Steel Slag Activity with Accelerated Carbonization Technology

钢渣是炼钢过程中排出的废渣,钢渣组成中的硅酸钙组分可以与CO_(2)发生碳化反应生成大量不规则的CaCO_(3)和具有胶凝性的SiO_(2)胶体,将钢渣变为具有一定强度的胶凝性材料。文章通过通入CO_(2)对γ-C_(2)S和钢渣进行加速碳化的方式,测试不同碳化时间对钢渣试块抗压强度的影响,结合X射线衍射和扫描电子显微镜分析其硬化机理,探索了加速碳化实现激发钢渣活性的可能性。结果显示:加速碳化可以有效激发钢渣的活性,CO_(2)在有水分的条件下与其中的硅酸钙组分生成CaCO_(3)和SiO_(2)胶体,可以增加钢渣试块的强度,有效地改善其性能。经过24h的加速碳化强化处理,钢渣试样固碳量约为7.07%,钢渣试块的抗压强度达到58.95 MPa。

Steel slag is a waste slag discharged from the steelmaking process,and the calcium silicate component in steel slag can undergo carbonization reaction with CO_(2) to generate a large amount of irregular CaCO_(3) and colloidal SiO_(2) with cement properties,which turns steel slag into a cementitious material with certain strength.In this paper,the effect of different carbonation times on the compressive strength of steel slag specimens is tested by means of accelerated carbonation of γ-C_(2)S and steel slag through CO_(2),and the hardening mechanism is analyzed by X-ray diffraction and scanning electron microscopy to explore the possibility of stimulation of steel slag activity with accelerated carbonization technology.The results show that accelerated carbonation can effectively stimulate the activity of steel slag,and in the presence of water,CO_(2) generates CaCO_(3) and SiO_(2) colloid with the calcium silicate in it,which can increase the strength of steel slag specimens and effectively improve their properties.After 24h of accelerated carbonation strengthening treatment,the carbon fixation of steel slag specimens is about 7.07%,and the compressive strength of steel slag specimens reached 58.95 MPa.