Study on the Reclamation Technology of Alkaline Phenol Formaldehyde Resin Bonded Sand

摘要

In this article we study the reclamation technology of alkaline phenol formaldehyde resin bonded sand. We find that there are a lot of evaporation components in the alkaline phenol formaldehyde resin bonded sand, and they can be effectively removed by drying or baking. The loss of ignition of the sand before and after the mechanical regeneration can be reduced by the baking of alkaline phenol formaldehyde resin bonded sand; it also can improve the stripping rate of the reclaimed sand. The acid demand value of the reclaimed sand increases with the increasing of temperature and reaches the maximum at 500°C, when the alkaline phenol formaldehyde resin bonded sand is baked below 500°C, and then the acid demand value of the regenerated sand reduces when the baking temperature increases. The tensile strength of alkaline phenol formaldehyde resin bonded sand mixed by the regenerated sand obtained by the 360°C baking and mechanical regeneration is higher than that of the sand mixed by the regenerated sand obtained by other methods in the case that the service time and the molding sand mixed by the base sand are the same, and has the best casting process performance.