CADMIUM REMOVING PROCESS IN ZINC-CONTAINING SOLUTION PURIFICATION AND PURIFICATION METHOD OF ZINC-CONTAINING SOLUTION

摘要

The present invention relates to a cadmium removal process during molten zinc purification and achieves a good cadmium removal effect. The present invention also relates to a method of hot-dip galvanizing which has excellent purging effect. The process for removing cadmium in hot zinc purification according to the present invention comprises the steps of: 1) conducting a colloid removal treatment on a supernatant obtained by precipitating a neutral exudate or a neutral exudate to obtain a molten zinc having a colloidal content of 50 mg / L or less; 2) a procedure of precipitating at least cadmium in molten zinc through zinc powder precipitation; 3) Solid-liquid separation filtration is carried out for molten zinc containing solid cadmium, and the filtration time is controlled within 60 minutes and the filtration precision is controlled to 10 μm or less. In the present invention, first, the colloid removal treatment is performed on the neutral exudate or the supernatant, and the solid-liquid separation filtration is performed through the zinc powder precipitation method. The colloid content in the molten zinc after the colloid removal and the solid- The final cadmium removal process was confirmed by selectively matching key parameters such as filtration time and filtration accuracy.