Mg-Ca Vortex Addition
Addition of MAG-CAL to the lead bath under agitation is the most effective and consistent technique. MAG-CAL is simply added to the vortex of the melt. A bath temperature of 480°C to 500°C (895°F – 930°F) produces complete dissolution of the alloy, with calcium recoveries of 90% or better.
Control of the process temperature is important for the successful addition of MAG-CAL. The process temperature ranges up to 520°C (970°F), however, the possibility of oxidation losses increases as process temperatures rise.
This technique eliminates the plunging cage and provides a homogeneous reaction environment. With MAG-CAL usage, bismuth levels as low as 0.003% have been achieved.