STUDY OF THE EFFECT OF SIZE FRACTION, MAGNETIC FIELD INTENSITY, AND MAGNETIC ROLL SPEED ON MAGNETIC CONCENTRATION RESULTS IN PRINTED CIRCUIT BOARD WASTE USING A DRY MAGNETIC SEPARATOR

• Main Author: Akbar, Syahrizon
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80492
• Institution: Institut Teknologi Bandung

Electronic waste continues to increase, causing serious environmental problems. One of the core parts of electronic devices is Printed Circuit Board (PCB) so the amount of PCB waste is also increasing. The recycling method is used because the process is environmentally friendly and also economical. In addition, PCB waste has potential because the concentration of valuable metals contained is 10 times higher than the primary ore source. In this study, a magnetic concentration process was carried out on PCB waste from various electronic devices using a dry magnetic separator. The experiment begins with the comminution process on PCB waste samples followed by initial characterization using optical microscopy, X-Ray Fluorescene (XRF), and X-Ray Diffraction (XRD). Dry magnetic separation was carried out to study the effect of size fraction, magnetic field intensity, and magnetic roll speed on the content and yield of magnetic concentration. The magnetic field intensity variations applied were 1500, 2500, 3500, and 5000 Gauss at size fractions of - 1168+1000, -1000+841, and -841+634 ?m with magnetic roll speed variations of 60, 90, 120, and 150 RPM at size -1168+1000 ?m and magnetic intensity of 5000 Gauss. Then the concentration results in the form of magnetic and non-magnetic products were analyzed using XRF and optical microscopy. Based on the results of XRF, XRD, and optical microscopy analysis, it is found that PCB waste has a diverse composition. Fe recovery decreased, while the recovery of Si, Cu, Ni, Al, Sn, Ti, and Zn in magnetic products tended to increase along with the greater magnetic field intensity. Then along with the larger size and greater roll speed, the levels and recovery of Fe, Si, Cu, Ni, Al, Sn, Ti, and Zn have a fairly fluctuating trend in both magnetic and non-magnetic products. The variable that produces the best results is obtained at a magnetic intensity of 2500 Gauss, size - 1168 + 1000 ?m, and roll speed of 60 RPM with Fe content and recovery in magnetic products of 47.09% and 86.08%; Ni by 2.75% and 59.55%; Si by 12.16% and 5.24%; Al by 10.91% and 10.04%; Cu by 13.77% and 8.19%; Sn by 0.497% and 2.69%; Zn by 0.89% and 6.98%; and Ti by 0.494% and 6.05%. Then the Fe content and recovery in non-magnetic products were 1.1% and 13.9%; Ni by 0.27% and 40.45%; Si by 31.77% and 94.76%; Al by 14.12% and 89.96%; Cu by 22.32% and 91.81%; Sn by 2.6% and 97.31%; Zn by 1.7% and 93.02%; and Ti by 1.11% and 93.96%.