During the pyrometallurgical processes, a substantial quantity of high-temperature ironmaking and
steelmaking slags, generated at temperatures ranging from 1400 to 1600°C, is wasted, as the heat
contained in these slags is released into the environment during the tapping process without effective
utilisation. On the other hand, a significant amount of energy is required to reheat the cold materials
for the manufacturing of glass and mineral-wool, often necessitating the addition of high-silica
materials to facilitate the production process. In this study, an innovative approach is presented to
harness the heat present in molten metallurgical slags to directly produce new raw materials for
glass and mineral-wool manufacturing while simultaneously reducing energy consumption and
mitigating CO2 emissions. The theoretical amount of waste glass that can be effectively added in the
process has been estimated via thermodynamic calculation. Experimental assessments were
conducted to examine the impact of high-silica waste materials on the dissolution, melting and
fluidity. Potential recipes for glass and mineral-wool manufacturing were suggested and an
assessment of the energy savings, and reduction in CO2 emissions with manufacturing of glass and
mineral-wool using this innovative approach were included. It was determined that the processes
could lead to a reduction of over 26 kg of CO2 emissions per 100 kg of new material used, primarily
due to the utilisation of heat from slag and the accelerated smelting process.