Method for reusing ferric trichloride corrosive liquid in gravure plate making

Abstract

The invention relates to a method for reusing a ferric trichloride corrosive liquid in gravure plate making. The method comprises the following steps: (1) performing primary filtration: removing impurities and granules of a waste liquid by using security cotton; (2) performing carbon filtration: filtering filtrate after primary filtration through activated carbon; (3) performing an replacement reaction: adding reduced iron powder into the filtrate after carbon filtration with stirring, enabling the components to react for 15-30 minutes, stopping stirring, and leaving to deposit naturally, wherein the addition amount of the reduced iron powder is 3-5 times of copper ions in the waste liquid; (4) concentrating: in a depressurized or high-temperature evaporation mode, concentrating till the baume degree meets a production control standard; (5) oxidizing: adding hydrogen peroxide and concentrated hydrochloric acid into a concentrated liquid; (6) filtering: filtering an oxidized liquid again to obtain the ferric trichloride corrosive liquid which can be reused. Compared with the prior art, the method is capable of completely solving the problem of waste liquid discharge, saving resources and protecting the environment, and has the advantages of being simple in method, easy to implement and the like.

Description

technical field [0001] The invention relates to a method for recycling ferric chloride corrosive liquid, in particular to a method for reusing ferric chloride corrosive liquid in gravure plate making. Background technique [0002] The initial application of laser plate making is to coat a layer of black glue on the copper-plated plate base, and then use a laser machine to perform gasification engraving without film, so that the required pattern is exposed, and then corroded with ferric chloride corrosion solution , to reach the required mesh depth, and finally restore the pattern by printing. [0003] At present, in the corrosion process of ferric chloride in the plate making industry, the used ferric chloride is treated as waste liquid. There are two treatment methods, one is recycled by a special recycling company, the other is directly into the wastewater treatment system, the first is because of the restrictions of the recycling company, only part of the waste liquid is...

AI Technical Summary

Problems solved by technology

There are two treatment methods, one is recycled by a special recycling company, the other is directly into the wastewater treatment system, the first is because of the restrictions of the recycling company, only part of the waste liquid is recycled, and the excess waste liquid still enters the wastewater treatment system. Because the concentration of ferric chloride waste liquid is very high, generally the content of ferric chloride is 15-20%, so a large amount of sludge will be generated during the treatment process, which will cause the wastewater treatment equipment to not be used normally, and at the same time, it will be treated as waste waste Liquid is also a great waste of resources and pollutes the environment.

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