Open AccessStabilisation of belite prepared from modified limestone waste sludge
Author(s) -
Alexandra Rybová,
Dana Kubátová,
Anežka Zezulová
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/583/1/012006
Subject(s) - wollastonite , tobermorite , gehlenite , belite , materials science , lime , leucite , raw material , chemical engineering , industrial waste , mineralogy , calcium silicate , metallurgy , waste management , clinker (cement) , chemistry , composite material , cement , phase (matter) , portland cement , organic chemistry , ceramic , engineering
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, K 2 O 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.