Present experimental work describes the synthesis of β-dicalcium silicate from rice husk by using dispersing agent during formation of calcium hydro silicate (CSH) gel. The growth of CSH gel retards the impeller mixing phenomenon. This type of problem can be resolved by using dispersing agent. Amorphous silica was obtained from HCl treated rice husk. Calcination temperature of rice husk was maintained at 600 oC for 90 minutes. In the presence of water, amorphous silica was treated with calcium oxide by using 0.2 % dispersing agent to develop CSH gel. The CSH gel was developed in oven for 12 hours at 90 oC followed by drying at 105 oC for 12 hours in an oven. Dried gels were heated up to 900 oC to obtain beta form of dicalcium silicate. The CSH gel and β-dicalcium silicate were examined by XRD, FTIR, SEM and TGA. It was observed that by using pretreated rice husk truly amorphous silica can be obtained. It was also observed that dispersing agent facilitated the formation of CSH gel. Observations further revealed that such amorphous CSH gel started converting into beta form of dicalcium silicate at 600 oC.

Syed Hassan Javed, Mohsin Kazmi, Umair Aslam and Nadeem Feroze