Parametric Optimization of CO₂ Mould Made of Reclaimed Sand for Better Collapsibility

Inherent drawback of CO₂ moulding i.e Poor knockout property made the subject of moulding sand reclamation more prominent. In the present paper it is attempted for optimization of the process parameters of CO₂ moulding process made of reclaimed sand for better knockout property. Retained compression strength after exposing the mould to 1000°C for ten minutes and cooling to room temperature is considered as measure of knockout property or collapsibility. Taguchi method is employed for the purpose. % of Sodium silicate, percentage of coal dust, mixing time and interaction between sodium silicate and mixing time have significant effect on the collapsibility.