This invention relates to the field of resource recycling technology, specifically disclosing a
system and method for extracting and recovering metals from
etching waste liquid. The extractant combination of this invention can minimize the loss of
etching aids, preserve the original composition of the
etching liquid, and allow the etching liquid to be completely reused after reducing
copper,
molybdenum, and other
metal ions. The extractant of this invention has a long effective life cycle of extraction-back-extraction, minimal loss of extractant aids in the extraction-back-extraction cycle, and no emulsification /
flocculation of the extract phase during the extraction process. The extraction rate of
copper and
molybdenum in the etching liquid is high. By using a specific three-phase extractant combination, more than 98% of
copper and
molybdenum in the waste liquid can be recovered. The copper extraction process has a good retention effect on
nitrogen azole etching aids, such as 5-aminotetrazole, thereby forming a
closed loop in the extraction-back-extraction cycle of the etching liquid, reducing material input and
pollution.