Fabrication of slag-glass composite with controlled porosity

The preparation and performance of porous ceramics made from waste materials were investigated. Slag from thermal electrical plant Kakanj (Bosnia and Herzegovina) with defi ned granulations: (0.500÷0.250 mm); (0.250÷0.125 mm); (0.125÷0.063 mm); (0.063÷0.045 mm) and 20 / 10 wt.% of the waste TV screen glass with a granulation <0.063 mm were used for obtaining slag-glass composites with controlled porosity. The one produced from the slag powder fraction (0.125÷0.063 mm) and 20 wt.% TV screen glass, sintered at 950°C/2h, was considered as the optimal. This system possesses open porosity of 26.8±1.0%, and interconnected pores with the size of 250–400 μm. The values of E-modulus and bending strength of this composite were 10.6±0.6 GPa and 45.7±0.7 MPa, respectively. The coeffi cient of thermal expansion was 8.47·10 -6 /°C. The mass loss in 0.1M HCl solution after 30 days was 1.2 wt.%. The permeability and the form coeffi cient of the porous composite were K 0 = 0.12 Da and C 0 = 4.53·10 5 m -1 , respectively. The porous composite shows great potential to be