Wollastonite powder was synthesized by microwave assisted solid-state reaction in a 2.45 GHz microwave furnace with a maximum power output of
2.4kW. Bio-solid waste eggshell and SiO2 were used as starting materials for the synthesis. -Wollastonite formation started at 800 ◦C. The single
phase was obtained after 10 min heating at 1100 ◦C. The use of microwave heating lowered the processing temperature and time for wollastonite
synthesis.