Heat recovery from hot blast furnace slag granulates by pyrolysis of printed circuit boards

Heat recovery from hot blast furnace (BF) slag is difficult to achieve but has great potential to recover energy and thereby reduce CO2 emissions. The objective of this work is to utilise the heat of hot BF slag granulates to generate combustible gas from printed circuit boards. The results showed that this is a possible process and that, after cleaning, the combustible gas could be injected into the BF as a fuel and reducing agent. The new process has advantages over the traditional process in energy saving and pollution emissions.