The invention relates to the field of
etching liquid recycling, in particular to an
etching liquid recycling process. The
etching liquid recycling process comprises the following steps that one time of
hydrogen peroxide treatment is carried out on acidic
copper-containing etching waste liquid, acid-base
neutralization and filter pressing are performed on the acidic
copper-containing etching wasteliquid and alkaline
copper-containing etching waste liquid, and a
filter cake and filtrate are generated; and the
filter cake is subjected to pulping, then 98%
sulfuric acid is added,
copper sulfate,water and
hydrochloric acid are generated, centrifugal
dewatering treatment is carried out after the
copper sulfate is crystallized,
copper sulfate pentahydrate and copper
sulfate mother liquor are produced, the filtrate is precipitated and transported to an
ion exchange tank for
ion exchange, waste liquid is transported to a
mixing tank, an appropriate number of
solid materials are added to be stirred for sufficient mixing and dissolving, and etching son liquid and solder stripping liquid are pumped into storage tanks after production is finished. By means of the process, copper ions in the copper-containing etching waste liquid can be efficiently displaced through the steps of
ion exchange, oxidation
aeration and
ion exchange, a regenerated etching solution is prepared, meanwhile, by-products, namely the
copper sulfate pentahydrate can be generated, and the very high economic value is achieved.