Leaching behavior of copper from waste printed circuit boards with Brønsted acidic ionic liquid.
In this work, a Brønsted acidic ionic liquid, 1-butyl-3-methyl-imidazolium hydrogen sulfate ([bmim]HSO4), was used to leach copper from waste printed circuit boards (WPCBs, mounted with electronic components) for the first time, and the leaching behavior of copper was discussed in detail. The results showed that after the pre-treatment, the metal distributions were different with the particle size: Cu, Zn and Al increased with the increasing particle size; while Ni, Sn and Pb were in the contrary. And the particle size has significant influence on copper leaching rate. Copper leaching rate was higher than 99%, almost 100%, when 1g WPCBs powder was leached under the optimum conditions: particle size of 0.1-0.25 mm, 25 mL 80% (v/v) ionic liquid, 10 mL 30% hydrogen peroxide, solid/liquid ratio of 1/25, 70°C and 2h. Copper leaching by [bmim]HSO4 can be modeled with the shrinking core model, controlled by diffusion through a solid product layer, and the kinetic apparent activation energy has been calculated to be 25.36 kJ/mol.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Jinxiu
J
Huang
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China. Electronic address: kyling@swust.edu.cn.
Mengjun
M
Chen
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Haiyan
H
Chen
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Shu
S
Chen
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Quan
Q
Sun
D000143:Acids / Q000737:chemistry; D003300:Copper / Q000302:isolation & purification*; D059029:Electronic Waste / Q000032:analysis* / Q000706:statistics & numerical data; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D007700:Kinetics; D010316:Particle Size; D012037:Refuse Disposal / Q000379:methods*; D013431:Sulfates / Q000737:chemistry
C525963:1-butyl-3-methylimidazolium; D000143:Acids; D007093:Imidazoles; D052578:Ionic Liquids; D013431:Sulfates; D003300:Copper
1-Butyl-3-methyl-imidazolium hydrogen sulfate ([bmim]HSO(4)); Copper recovery; Ionic liquid; Leaching kinetics; WPCBs mounted with electronic components