炼钢 ›› 2022, Vol. 38 ›› Issue (2): 83-88.

• 节能环保 • 上一篇    

钢渣砖碳酸化性能的研究

张  平1,张冰心1,常  钧2   

  1. (1.贵州师范大学 材料与建筑工程学院,贵州 贵阳 550025;
    2.大连理工大学 建设工程学部,辽宁 大连 116024)
  • 出版日期:2022-04-05 发布日期:2022-03-28

Study on the mechanical properties of carbonation of steel slag bricks

  • Online:2022-04-05 Published:2022-03-28

摘要: 将济南钢铁厂的钢渣置于密闭容器当中,并通入100 %的CO2气体进行碳酸化,以寻找一种新的利用钢渣的方法,从而实现工业渣的零排放、降低企业成本。研究发现:钢渣在一定压力下能吸收一部分CO2,碳酸化后钢渣试件的强度比未碳化钢渣的强度有大幅度的提高。通过重量法测定钢渣粉在水灰比为14.5 %时,制备的钢渣砖碳酸化增重率最高,为15.05 %,对应的抗压、抗折强度分别为36.88、9.69 MPa;通过XRD以及FE-SEM微观测试方法可以得到,试件力学性能提升的原因是钢渣中原有的Ca2+、掺加的水和CO2发生碳酸化反应,生成了CaCO3,导致微观结构更为致密、孔隙直径减小、总孔隙体积减小。

关键词: 钢渣, 碳酸化, CO2吸收, 力学性能, 钢渣制品

Abstract: In order to find a new method of utilizing steel slag, the steel slag aggregate from Jinan Iron and Steel Plant was placed in an airtight container and carbonated with 100 % CO2. Experimental results showed that steel slag could absorb CO2 under a certain pressure, and the strength of steel slag specimen after carbonation was greatly improved compared with that without carbonation. When the water-cement ratio of steel slag powder was 14.5 % by gravimetric method, the weight gain rate of carbonation of steel slag brick was 15.05 %, and the corresponding compressive strength and flexure strength were 36.88 MPa and 9.69 MPa respectively. According to XRD and FE-SEM microscopic test methods, the reason for the improvement of mechanical properties of specimens was that the Ca2+ in steel slag, the water added with CO2 carbonated to generate CaCO3, resulting in a denser microstructure and reducing pore diameter.

Key words: steel slag, carbonation, CO2 absorption, mechanical properties, steel slag products