Stabilisation of belite prepared from modified limestone waste sludge

International Conference Building Materials, Products and Technologies

材料科学;工业技术（总论）

Rybova, A.^1 ; Kubatova, D.^1 ; Zezulova, A.^1

Research Institute for Building Materials, Hnvkovského 65, Brno

61700, Czech Republic^1

关键词: Acetylene gas;    Burned products;    Dicalcium silicate;    Gehlenite;    Laser granulometry;    Stabilizing agents;    Tobermorite;    Waste sludge;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012006/pdf
DOI  :  10.1088/1757-899X/583/1/012006

来源: IOP

【 摘 要 】

Presenting work deals with the use of waste materials-waste sludge from mining and washing of limestone and waste material from acetylene gas cylinders containing mainly tobermorite and xonotlite. Both materials were characterized by X-ray powder diffraction, laser granulometry and chemical analysis. After drying and milling of raw materials, they were mixed together and homogenised resulting in 3 sample series with different ratios of these materials. The mixtures were then burned at 1150°C and 1350°C and the main products formed were lime, dicalcium silicate, wollastonite, pseudowollastonite and gehlenite. To preserve hydraulically active belite, K2O as stabilizing agent was added in amount of 1 and 3 wt. %. Burned products were studied by means of X-ray diffraction and optical microscopy. Also hydration was observed.