Magnesium treatment process developed and patented by Meehanite for the production of nodular graphite cast iron.

The treatment is carried out by means of a master alloy by passing the iron through a treatment vessel and can either be carried out directly during tapping at the furnace or with an intermediate ladle. This makes this treatment technology very flexible and enables treatment of iron volumes between 150 and 3,000 kg. The relatively short treatment times range between 35 seconds for 500 kg iron and 100 seconds for 3,000 kg iron. Particular advantages are the safety of the process and simple operation, quick sequence of operations at low temperature loss, no pouring or covering of the master alloy, clean pouring ladles and respectively clean iron with a magnesium yield of approx. 60 - 70 %

It is recommended to applied master alloys with 3 to 5 % Mg. The basic iron may have a sulfur content of up to 0.020 %. Treatment temperatures of 1450 – 1460 °C ensure minimum development of smoke. A vented chamber is not required. The temperature loss at the treatment ranges between 60 and 80 °C.

Additional references:
Magnesium fading
Magnesium treatment wire
Magnesium residual content