건식벨트형 자력선별에서 자성입자의 궤적모사
Trajectory Simulation of Magnetic Particles in Dry Belt Type Magnetic Separation
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초록
자력선별법은 광물 및 폐기물 등 다양한 산업에서 활용되고 있는 광물처리의 중요한 분야이다. 본 논문에서는 건식벨트형 자력선별시스템에서 입자궤적을 모사하고 자력선별 주요변수간의 관계를 도출하고자 하였다. 자기장 모사는 유한요소해석 프로그램에 의해 수행되었고 주요 영향 변수는 수직이격 거리이었다. 최대 자기장세기는 영구자석로부터 X축의 0.31 m 지점에서 형성되었다. 입자궤적모사는 강자성(자철석), 상자성(티탄철석) 및 반자성(석영) 물질에 대해 자기장세기, 입자크기 및 단체분리도의 조건변화에 따라 수행되었다. 모사결과, 입자크기와 비중에비해 자화율과 자기장세기가 입자궤적에 영향을 미치는 주요 변수임을 확인하였다. 이로부터 자철석과 티탄철석을선별하기 위한 최소 자기장의 세기가 회귀식에 의해 도출되었다.
Abstract
Magnetic separation, which has been widely used in various industries (e.g., mineral and waste treatment) is an important part of mineral processing. In this study, the simulations of particle trajectories and the relationships between the main parameters in a dry belt-type magnetic separation system are presented. The magnetic field strength simulated by finite element analysis depended upon the vertical distance; the maximum strength was formed at a 0.31 m along the x-axis from a permanent magnet. Simulations of particle trajectories were conducted on ferromagnetic (magnetite), paramagnetic (ilmenite), and diamagnetic (quartz) materials, with variable parameters such as magnetic field strength, particle size, and degree of liberation. The simulation results showed that the key factors of magnetic susceptibility and field strength considerably affected the particle trajectory, as compared with particle size and specific gravity. Hence, the minimum magnetic field strength needed to separate magnetite and ilmenite could be obtained by the regression equation
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