SUITABLE SEPARATION TREATMENT OF STONY COMPONENTS IN CONSTRUCTION AND DEMOLITION WASTE (CDW

摘要

Worldwide most construction and demolition waste (CDW) is currently dumped. Even though it has been recycled in some countries for examples, the Netherlands, Belgium and Denmark, most of the recycled CDW are reused in low technical applications of road constructions. It is down-cycled. To close the building cycle and the building materials cycle by recycling CDW in high technical applications, the technical quality of stony materials must be improved. For this purpose, concrete rubbles and brick rubbles, the two major stony constituents of CDW, should be separated from each other. Based on the differences in density and content of Fe_2O_3 between the two materials, a wet method of jigging and a dry method of magnetic separation are effective, tested in laboratory.