물리적선별법에 의한 ASR로부터 철 및 비철금속의 회수

Abstract

Abstract

-Recovery of Particulate Ferrous and Nonferrous Metal from ASR by Physical Separation-

By Kim, Yang Soo Adv. Prof. : Park, Chul Hyun Dept. of Energy Resource Engineering Graduate School, Chosun University

Due to the improvement of economic life quality of citizens in 2015, it reached to about 21 million for the number of registered domestic automobiles in Korea. Accordingly, it is occurring the 770 thousand wastes. However, recycle rate of waste automobiles in Korea is low, compared to that of the developed countries. Therefore, laws about recycling of resources to promote the recycle of waste automobiles are implemented following the world trend, but based on 2015, it did not even reach to 95 percent for recycling duty rate. Thus, it is important to develop technologies for recycling of waste automobile. Automotive shredder residue (ASR), the residual fraction of approximate 25% obtained after dismantling and shredding from waste car, consists of polymers (plastics and rubber), metals (ferrous and non-ferrous), wood, glass, and fluff (textile and fiber). ASR cannot be effectively separated due to its heterogeneous materials and coated or laminated complexes, and then largely deposited in land-fill sites as waste. Thus, reducing a pollutant release before disposal, techniques that can improve the liberation of coated (or laminated) complexes and the recovery of valuable metals from the shredder residue are needed. ASR may be separated by a series of physical processing operations such as comminution, air, magnetic and electrostatic separations. The work deals with the characterization of the shredder residue coming from an industrial plant in Korea, and focuses on estimating the optimal conditions of corona electrostatic separation for improving the separation efficiency of valuable non-ferrous metals such as aluminum, copper and etc. It carried out the experiments by line of wind force and magnetic force, prior to the experiment of electrostatic line of type of corona discharge. As a result of experiment, it could be obtained 87.3% in the recovery rate of high density group, and 87.1% in that of low density group, respectively, among conditions of -10mm and 2m/s. In case of line by magnetic line, it could have outputs of each 91.5% and 91% in the grade of magnetic output and recovery rate, under conditions of –10mm and 400 Gauss. For the non-ferrous outputs, the maximum separation achievable for non-ferrous metals using a corona electrostatic separation has been shown to be recovery of 90.7% at a grade of 79.2%, from the results of test. The recommended values of the process variables, particle size, electrode potential, drum speed, and splitter position are -6mm, 50kV, 35rpm, respectively.