+150°C @ 2 hr

by ball milling machine

800°C @ 2h

900°C @ 2h

1000°C @ 2h

900°C @ 1h / 900°C @ 3h

at 900°C & 2 hr

ozone (0.2-0.8 g/min)

dose CaO (0.5-2 mg/L)

pH (3-11)

time (30-120 min)