SAND MIXING PROCESS FOR IMPROVING COMPREHENSIVE PROPERTY OF RESIN SAND

摘要

A sand mixing process for a resin sand comprises dividing casting sand into at least two parts. Each part of casting sand is pre-mixed with one corresponding composition to form a pre-mixed mixture. Each composition is one or more added materials which do not undergo a chemical reaction with each other, and each composition is different. A plurality of pre-mixed mixtures are finally mixed to form a final mixture. The pre-mixed mixtures in the sand mixing process can be stored for a long time, can be mixed and used at any time, and during final mixing, the pre-mixed mixtures are subjected to a sufficient chemical reaction with each other or mutually promote the reaction for binding and molding, so that the final mixture is more uniform, thereby improving comprehensive properties of the mixed sand.