Slaking water temperature should be sufficiently high so that the final slaking temperature is at least 85°C (185°F) - depending on site elevation.
Final slaking temperature will follow this formula:
Incoming water temperature + heat of reaction = final slaking temperature
For example, if you are slaking high calcium quicklime (93% available CaO) at a 4:1 water:lime ratio, the temperature rise from the heat of reaction can be up to 57°C (103F). In this case to achieve a slaking temperature of 85°C (185°F) incoming water temperature would need to be 28°C (82°F). Please note that every quicklime source will have its own temperature rise characteristics - this information can come from your quicklime supplier, and can be varified independently.
Do I need to heat my slaking water?