To provide a method for cleaning an electroless nickel plating waste liquid and a method for recovering nickel and a phosphate and recycling them using simple apparatus by a low-cost and effective process by eliminating a problem in the conventional oxidation method for cleaning the electroless nickel plating waste liquid.
The method for cleaning an electroless nickel plating waste liquid comprises: a first step where nickel ions are separated from an electroless nickel plating waste liquid; a second step where hypophosphoric acid ions in a separate liquid obtained in the first step are oxidized into phosphorous acid ions by an oxidation catalyst; a third step where the phosphorous acid ions obtained in the second step are oxidized into orthophosphoric acid ions by an oxidation catalyst; and a fourth step where the orthophosphoric acid ions obtained in the third step are converted into a phosphate, which is subjected to filtering/separating, thus is cleaned into a waste liquid having a phosphorous concentration of ≤16 mg//l, and the phosphoric acid is recovered as a phosphate.
COPYRIGHT: (C)2010,JPO&INPIT
Hideko Miyata
Toshiki Matsui
Horiishi Nanao
| JP11226596A | ||||
| JP2000345357A |
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito