Sintering preparation of porous sound-absorbing materials from steel slag

Porous sound-absorbing materials were prepared from steel slag using waste expanded polystyrene (EPS) particles as pore former. The influences of the experimental conditions such as fly ash content, sintering temperature, sintering time, and pore former addition on the performance of the porous sound-absorbing materials were investigated. The results show that the porosity of the specimens can reach above 50.0%; the compressive strength and average sound-adsorption coefficient of the sintered specimens are above 3.0 MPa and 0.47, respectively. The optimum preparation conditions for the steel slag porous sound-absorbing materials are as follows: mass fraction of fly ash 50%, waste EPS particles 3.6 g, sintering temperature 1100 °C, and sintering time 7.5 h, which are determined by considering the properties of the sound-absorbing materials, energy consumption and cost.