Method for preparing cathode active material precursor for secondary battery, and preparation apparatus using same

A preparing apparatus of a cathode active material precursor for a secondary battery, the preparing apparatus comprising:

• a co-precipitation filtrate storage tank configured to store a co-precipitation filtrate generated after a co-precipitation reaction;
• a filter configured to remove a metal hydroxide from the co-precipitation filtrate;
• an ammonia removal membrane contactor configured to remove ammonia from the co-precipitation filtrate from which the metal hydroxide is removed;
• a sulfuric acid or nitric acid tank configured to supply sulfuric acid or nitric acid to be in contact with ammonia to the ammonia removal membrane contactor;
• a cooling and crystallizing tank configured to cool and crystallize the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate sodium sulfate;
• a filter configured to filter the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed;
• a dryer configured to dry the sodium sulfate separated from the co-precipitation filtrate;
• a circulation concentration tank configured to store the co-precipitation filtrate separated from the sodium sulfate;
• and
• an initial solution preparation tank configured to heat the co-precipitation filtrate stored in the circulation concentration tank to a predetermined temperature for recycling and to perform N2 purging or bubbling.