The research aimed to produce diatomite supported nano-Cu(OH)2 wettable powder from aqueous solution with the anolyte from cupriferous etching wastewater as raw material after membrane electrolysis. The influences of such factors as NaOH addition amount

diatomite addition amount and type of stabilizer on the preparation of nano-Cu(OH)2 were also discussed. The results indicated that the optimum conditions were as follows: waste etching liquor 10 ml

NaOH (2 mol·L-1) 45 ml

diatomite (44 mm) 1.6 g

stabilizer (5% tributyl phosphate solution) 100 ml. The powder prepared under optimum conditions was characterized with scanning electron microscopy (SEM)

transmission electron microscope (TEM) and X-ray diffraction (XRD). Under those conditions

the OH-/Cu2+molar ratio of the final product was 1.872

the content of copper hydroxide was about 66.03%

and the size of particle was about 45 nm

which met the performance requirement for the nano- Cu(OH)2 product. The experiment proved that the preparation technology was feasible and easy to operate

and could be an effective way for recycling waste etching liquor.