Which of the following is used to increase refractoriness of sand?
A)Graphite
B)Silica flour
C)Iron free zirconium
D)all of the above

Question

Quizplus · Accepted Answer

All the options listed, including graphite, silica flour, and iron-free zirconium, are materials used to increase the refractoriness of sand in foundry applications. Refractoriness refers to the ability of the molding material to resist the high temperatures of molten metal without breaking down or deforming. Graphite acts as a parting compound and also improves the surface finish of the casting. Silica flour is used to enhance the refractoriness of the sand. Iron-free zirconium is used for its high thermal stability and resistance to metal penetration and reaction.

Which of the Following Is Used to Increase Refractoriness of Sand