According to the current study of used sand reclamation and its develop ment, new viewpoints of selecting the methods and equipments of used sand reclamation are expounded.

Based on the analysis of the process of sand reclamation by way of centrifugal friction,the dynamic calculation on sand movement is made,and the system of sand reclamation by friction with the help of striking is presented.

In this paper, problems of old sand recycling in the process of gummy sand and water glass sand were discussed; old sand forming mechanism, process of old sand recycling and application of the equipment set were analyzed.

Prevention on foundry sand waste pollution was introduced from the aspects of old sand recycling,waste sand resources utilization,and the development and utilization of environment protection type of the binder used for casting.