Recycling of Cu powder from industrial sludge by combined acid leaching, chemical exchange and ferrite process.
A method in combination of acid leaching, chemical exchange and ferrite process was applied to recycle copper and confer higher chemical stability to the sludge generated from etching process in printed circuit board industry. Ninety-five percent copper could be recycled in the form of powder from the sludge. Moreover, not only the wastewater after chemical exchange can be treated to fulfill the effluent standard, but also the sludge can satisfy the toxicity characteristic leaching procedure (TCLP) limits made by Taiwan's environmental protection administration.
Tu
Yao-Jen
YJ
Earth Dynamic System Research Center, National Cheng-Kung University, Tainan City, Taiwan, ROC. todojen@gmail.com
Chang
Chien-Kuei
CK
You
Chen-Feng
CF
Lou
Jie-Chung
JC
D000143:Acids; D003247:Conservation of Natural Resources / Q000379:methods*; D003300:Copper / Q000302:isolation & purification*; D005290:Ferric Compounds; D007220:Industrial Waste / Q000331:legislation & jurisprudence / Q000517:prevention & control*; D008722:Methods; D011208:Powders; D012722:Sewage / Q000737:chemistry*
D000143:Acids; D005290:Ferric Compounds; D007220:Industrial Waste; D011208:Powders; D012722:Sewage; C001215:ferrite; D003300:Copper