พฤติกรรมการหลุดแยกของทองแดงจากแผ่นวงจรอิเล็กทรอนิกส์ จากการลดขนาดด้วยเครื่องย่อยแบบลูกกลิ้งฟันเลื่อยและเครื่องบดแบบแท่งโลหะ

• Main Author: ชรัช ฉวีบุญยาศิลป์
• Other Authors: ขวัญชัย ลีเผ่าพันธุ์
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 2011
• Subjects: ขยะอิเล็กทรอนิกส์ > การนำกลับมาใช้ใหม่; วงจรพิมพ์; ทองแดง; การแยก (เทคโนโลยี); Electronic waste > Recycling; Printed circuits; Copper; Separation ‪(Technology)‬
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:43478
• Institution: Chulalongkorn University

In recycling of valuable metals from printed circuit boards (PCBs) waste, comminution is the key step to determine the efficiency of separation. Comminution of PCBs is normally performed using equipments such as hammer mill and shredder that were not designed to comminute PCB specifically. Due to the fact, PCBs that consist of copper sheet rolled on, are flat and ductile, new crusher equipment, "Groove Teeth roll crusher" based on shear force, was used to improve the efficiency of size reduction. In this research, the Groove teeth roll crusher together with rod mill comminution was investigated. In the first step, PCB wastes were crushed by Groove Teeth roll crushers on difference teeth width between 3 mm. and 4 mm., and a rod mill, with varying of grinding time. The behaviors of copper liberation were investigated on each step of comminution, the particle size distribution of crushed PCB wastes were prepared by sieve analysis method. The degree of copper liberation was determined using grain-counting method and the shapes of crushed PCB were investigated by optical microscope for each size range. The behavior of comminution process was considered in term of the breakage function. From the results, the behavior of copper liberation was shown in size range 504-1001 micron and the distribution curves with crushing by Groove Teeth roll crusher were quite smooth. The breakage function trended to the results of experiment.