Etching liquor and circular use method thereof

Abstract

The invention discloses etching liquor and a circular use method thereof. The etching liquor comprises copper chloride, organic amine, an oxidizing agent, an additive agent and deionized water. In each liter of etching liquor, 10 to 150 g of copper chloride, 10 to 200 g of organic amine, 1 to 100 g of the oxidizing agent, 1 to 100 g of the additive agent and the balance deionized water are included; in the use process of the etching liquor, the solution is alkaline, and the requirement for a device is not high, the use cost is low, operation is safe and environment-friendly, and a detection control system is simple; low etching is achieved, the etching speed is high, and stability is high. A membrane separation technology and a deposition reduction technology are combined, circular recycling of the etching liquor can be well achieved, a product after the reaction is nitrogen and water, other impurities are not brought in, and filter liquor obtained after copper filter and depositing can be recycled to be used for preparing new etching liquor.

Description

technical field [0001] The invention relates to the technical field of etching solution, in particular to an alkaline etching solution and a recycling method thereof. Background technique [0002] Etching liquid regeneration is actually a process in which the etching mother liquid discharged from the printed circuit board (PCB) etching line adopts a closed circulation system, and the copper ions in it are extracted by the etching liquid regeneration cycle equipment and then returned to the production line. [0003] During the etching process of the circuit board, the concentration of copper ions in the etching solution will gradually increase to reduce the etching effect. To make the etching solution achieve the best etching effect, the copper ions (Cu 2+ ), sulfate ion SO 4 2- ) and pH value in a reasonable and stable range, in order to maintain the optimal concentration of the above-mentioned components in the etching solution, it is necessary to continuously add sub-liq...

AI Technical Summary

Problems solved by technology

For this kind of hazardous liquid waste, some small PCB companies directly discharge it, seriously polluting the environment; larger PCB companies or waste treatment units have carried out resource utilization starting from copper extraction, such as processing copper sulfate, etc., but the processing process will be Further produce industrial wastewater dozens of times the amount of liquid waste, the concentration of copper in which is generally higher than the wastewater discharge standards of the National Environmental Protection Agency, and no targeted treatment measures have been taken for non-copper components in liquid waste

Therefore, the treatment or treatment process after the copper etching solution (replacement) is scrapped is a process that further spreads the pollution source, causing damage to water resources and the ecological environment