석재가공공정에서 발생하는 폐석재 및 폐석분슬러지의 재활용을 위한 물리·화학적 특성 및 환경성 평가

The purpose of this study was to determine the feasibility of using waste stone and waste stone sludge, generated by stone grinding operations, as substitutes for natural resources. In addition, the possibility of expanding the scope of safe recycling was confirmed via an environmental assessment. This assessment was carried out by measuring particle size distributions and physical and chemical characteristics, as well as via dissolution and content tests. Waste stones and powdered waste stone sludge generated from the I-, K-, and R-quarries located in the Geochang area were selected and sampled. The pH was weakly alkaline (7.74 - 9.7), and the water content ranged from 21.29% to 32.57%. Only the Iquarry sample exceeded the 30% water content limit. The Waste Control Act regulates the use of filler materials such as bottom restoration and lowland materials in the quarry to less than 30%. Leaching tests conducted using I-, K-, and R-quarry samples were analyzed. The samples did not exceed the controlled waste criteria for hazardous substances defined by the Waste Management Act. The limits for Pb, Cr, As, Hg, Cd, and Cr6+ are 3 mg/L, 3 mg/L, 1.5 mg/L, 0.005 mg/L, 0.3 mg/L, and 1.5 mg/L, respectively. Based on the results of content tests, only Cu (252 mg/Kg) exceeded the 1 area standard (150 mg/kg) for troublesome soil contamination defined in the Enforcement Regulations of the Soil Environment Conservation Act. Based on this environmental assessment, current policies allow expansion of recycling.