This research investigated the treatment of waste flux in the electronic industry by comparing 6 methods : treatment with activated corbon, steam distillation, vacuum distillation, open air burning, ozone treatment and catalytic hydrogenation. It was found that activated carbon could not decolorize waste flux. Steam distillation could separate activators, rosin and solvent. The rosin was decomposed. Therefore, it was not suitable for reusing. The solvent had unpleasant odor. The activators were dissolved in water but it was not worth for recovery. Reduced pressure distillation could not separate waste flux because it decomposed. Bumming of waste flux directly flux directlyl white fume. Treatment of waste flux with ozone followed by oxidation gave pale yellow material which could be used as a new activator with three –COOH groups. However this activator gave brown residue after soldering. Catalytic hydrogenation of waste flux changed dark brown color of waste flux to yellow. The best condition was 100 ℃, 450 psi pressure for 12 hours using palladium on charcoal as catalyst with 1 : 200 ratio of catalyst of catalyst to waste flux.
