STUDY ON OPTIMIZATION OF PRINTED CIRCUIT BOARDS RECYCLING USING MAGNETIC CONCENTRATION METHOD TO OBTAIN VALUABLE METALS: REVIEW

• Main Author: Toyib Rasyidin, Bagus
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69325
• Institution: Institut Teknologi Bandung

Electronic waste (e-waste) has been widely produced in the world so that the amount continues to increase from year to year. However, the effort of collecting and recycling e-waste to obtain valuable materials is still lacking. PCBs (printed circuit boards) which is one of the e-waste contains precious metals which can be a secondary metal source, especially the abundant Cu metal. Processing of spent PCBs can be carried out by physical and mechanical separation using magnetic concentrations. There are many efforts that can be made on the magnetic concentration method to increase metal content and recovery, including by optimizing the process parameters and preparing the feed optimally. In this study, the influence of process parameters and the effect of feed pre-treatment on the output obtained will be discussed. In this study, literature was collected with keywords magnetic separation, PCBs, physical separation, dan recycling. The literature that has been obtained is then choosed and selected according to the research topic. Each literature is compared to obtain the most optimal parameters and process sequences. At the end of the study, conclusions were drawn that answered the objectives and suggestions for further research. The results of the study on process parameters are the yield and concentration of concentrates tend to be concentrated in certain size fractions. There is a size range for metals to be separated properly. Computer PCBs waste are optimally treated at a feed size of -2000 +250 ?m to obtain Fe and Ni in the magnetic fraction and Cu in the non-magnetic fraction. Cell phone PCBs waste are more optimally processed at a feed size of -1000 ?m to obtain Fe and Ni in the magnetic fraction while to obtain Cu in the non-magnetic fraction, it is optimally at a feed size of -4000 ?m. Printer PCBs waste are optimally processed at a feed size of -1000 ?m. The iron recovery is increasing, while the concentration grade decreases as the magnetic field intensity increases with the optimal magnetic field intensity condition being at 3000-3150 G. The iron recovery increased with increasing surfactant solution concentration at wet magnetic concentration. However, it is not good enough at too high surfactant concentrations. Fe obtained in the magnetic fraction that was more optimal was made with a concentration of 60 ppm Octyl Phenol Ethoxylate (OPE). The more optimal Cu obtained in the non-magnetic fraction can be made using 80 ppm ethanol concentration. Crushing conditions by heating at a temperature of 600 °C and under argon gas atmosphere can obtain Fe and Ni in the magnetic fraction while the recovery of Cu in the non-magnetic fraction optimally.