4、operation mode,additivesandOstwaldripeningonthewastewatertreatmentandthe crystallization behaviorofzinchydroxide particleswereinvestigated bythe scanningelectron microscope,particlesize distribution andinfraredspectrumanalysis. The resultsshowthattheprimarynucleation is dominantin the
5、continuous operations withoutoverflow,while thecrystalgrowth andagglomeration are primaryin continuous operationswith 2+ overflow.Additivesofpolyethylene glycol(PEG)with appropriate relative molecularmass can obviouslyincreaseZn removalefficiencyand largeparticles withcompactstructure
6、and regularmorphologycan be obtained.Moreover,Ostwaldripeningcanimprove theparticlesize distribution and increasethe meanparticlesize ofthe reaction crystallization products.Keywords:reaction crystallization;zinccontainingwastewater;operation mode;additive;ripening 有色金属选冶及加工过程产生的废水中常含