Alternative utilization of the core sand for a green-sand system

Abstract

The foundry industry, like the other human activities, is associated with the production of various wastes. These secondary products of manufacturing are mainly composed of the moulding mixture, dust waste, fire-refractory materials and other wastes. A utilization of the waste moulding mixture, especially the core sand based on organic resins, as a replacement for new sand, can be a way of decreasing the portion of moulding-mixture waste, thus also decreasing its negative impact on the environment. Nowadays, the most preferred technology for manufacturing moulds is the green-sand system with clay (bentonite) as the binder. The aim of this study is to determine the influence of a core-sand addition on the mechanical, physical, chemical and technological properties of the green-sand system.