(843) 972-8473 info@mroresources.net

Why Use SiC in Coreless Induction Melting of Iron

Why Use SiC in Coreless Induction Melting of Iron
  • Reduces FeO and MnO slags in the furnace. SiC + 2FeO – Si + 2Fe + CO2
    • FeO and MnO slags react with the SiO2 in the lining to produce fayalite eroding the lining surface. Removing FeO and MnO reduces lining wear.
    • Removing FeO and MnO in melting keeps them out of the castings. Some foundries report a 50% reduction in slag defects in their castings.
    • Less slag going to the landfill.
    • Reduced power consumption.
  • Lowest cost Silicon unit and also has a carbon benefit.
    • SiC contains approximately 63% Si, 27% C in SiC, and 3% free Carbon.
    • Silicon recovery is in 90% to 95% range, Carbon recovery is in the 87% – 92% range.
    • Consider the price you pay for FeSi and Carbon and you will find SiC is a money saver.
  • De-Oxidizes the melt
    • Reduces or stabilizes the chill behavior of the melt.
    • Renders higher and more consistent Mg treatment.
  • How to use:
    • SiC disassociates (dissolves) rather than melts.
    • Therefore: Add before the charge metallics with the carbon raiser to longest exposure to the liquid melt, most stirring action, etc.
    • If possible, add with furnace power on.
    • Usage rate is typically 15-30 lbs/ton charged for gray iron and 8-20 lbs/ton charged for ductile iron. Note: Charging the maximum amount allowed by the base Si control range will provide the most benefit and savings.

Source: Dauber Company, Inc.  Manufacturer of High Quality Silicon Carbide Briquettes. Made in the USA