Every step of the process's described here are dangerous, and should not be done without industrial safety precautions and ventilation in place.
Quicklime will 'dissolve' an entire human body, and was used to do so in the past, CalciumHydroxide can cause skin irritation, blindness if you get it in your eyes and severe lung damage if inhaled.
This article while factual neglects the severe levels of danger involved.
900C is not just hot, it is copper and silver metlingly hot