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A technology of waste liquid recovery and plate browning, which is applied in chemical instruments and methods, oxidized water/sewage treatment, photography technology, etc. Copper easy and relaxing effect
Inactive Publication Date: 2021-04-23
HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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[0017] In view of the above-mentioned deficiencies, the present invention provides a method for recycling printed circuit board browning waste liquid, which can effectively solve the problems that electroplated copper is not formed and cannot be electroplated, and provides a process that can solve the above problems. The content of the present invention is as follows :
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Embodiment 1
[0046] A method for recycling printed circuit board browning waste liquid comprises the following steps:
[0047] Step 1: Add 0.55wt% oxidant to the browning waste liquid of printed circuit boards, add 0.55wt% digestion agent, stir at 25°C for 2h, and then carry out oxidative decomplexation reaction for 12h to obtain mixture A.
[0049] Among them, the COD content of the printed circuit board browning waste liquid is 15000, and the copper ion content is 25g / L.
[0050] Step 2: Filter the mixture A obtained in step 2 through a filter to obtain organic matter A and filtrate A, add chlorine salt to the filtrate A and perform a pre-electrolysis reaction for 1.5 hours, the current density of the pre-electrolysis During the electrolysis process, the filtrate A is circulated and filtered until the filtrate A no longer produces visible organic floating matter, and the filtrate...
Embodiment 2
[0060] A method for recycling printed circuit board browning waste liquid comprises the following steps:
[0061] Step 1: Add 0.1wt% oxidant to the browning waste liquid of printed circuit boards, add 0.1wt% digestion agent, stir at 18°C for 1h, then carry out oxidative decomplexation reaction for 14h to obtain mixture A.
[0063] Among them, the COD content of the printed circuit board browning waste liquid is 10000, and the copper ion content is 25g / L.
[0064] Step 2: The mixture A obtained in step 2 is filtered through a filter to obtain organic matter A and filtrate A, and after adding chlorine salt to the filtrate A, carry out a pre-electrolysis reaction for 1 h, and the current density of the pre-electrolysis is 1asd, during the electrolysis process, the filtrate A is circulated and filtered until the filtrate A no longer produces visible organic floating matter, an...
Embodiment 3
[0074] A method for recycling printed circuit board browning waste liquid comprises the following steps:
[0075] Step 1: Add 1wt% oxidant to printed circuit board browning waste liquid, add 1wt% digestion agent, stir at 18-35°C for 3h, then carry out oxidative decomplexation reaction for 10h to obtain mixture A.
[0077] Among them, the COD content of the printed circuit board browning waste liquid is 20,000, and the copper ion content is 30g / L.
[0078] Step 2: The mixture A obtained in step 2 is filtered through a filter to obtain organic matter A and filtrate A, and after adding chlorine salt to the filtrate A, carry out a pre-electrolysis reaction for 2 hours, and the current density of the pre-electrolysis is 3asd, during the electrolysis process, the filtrate A is circulated and filtered until the filtrate A no longer produces visible organic floating matter, ...
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Abstract
The invention belongs to the technical field of heavy metal waste liquid recovery methods, and provides a printed circuit boardbrowning waste liquid recovery method. According to the method, an oxidizing agent is used for pretreatment to decompose part of refractory organic matters into micromolecular organic matters, the treatment difficulty of pre-electrolysis is reduced, and the oxidizing agent is small in addition amount and good in effect; before electroplating, pre-electrolysis is carried out, chlorine salt is added, chlorine generated by an anode can both oxidize the organic matters and solve the problem that the anode efficiency is low due to attachment of the organic matters to the anode; and after two times of treatment of decomplexing degradation of the organic matters and pre-electrolysis oxidation of the organic matters, the influence of the organic matters on copper deposition during cathodecopper deposition is solved, the copper plating effect in the electrolysis process is better by adding an electrolysis additive, electroplated copper can be effectively crystallized into blocks and is easy to peel off, the quality of discharged copper is improved, the income of the copper is increased, copper discharging is easier, the COD of a solution obtained after electric cleaning is low, the heavy metal content is low, and the treatment difficulty and the treatment cost of browning waste liquid of a comprehensive wastewaterstation are reduced.
Description
technical field [0001] The invention belongs to the technical field of heavy metal waste liquid recycling methods, and in particular relates to a method for recycling printed circuit boardbrowning waste liquid. Background technique [0002] Browning technology is an indispensable process of PCB inner layer board. With the need for high-precision and high-density integrated circuits, the manufacturing technology of printed circuit boards tends to develop more sophisticated multi-layer circuit boards. Thereby increasing the consumption of browning liquid and the generation of browning waste liquid. [0003] The browning solution itself uses sulfuric acid and hydrogenperoxide to micro-etch the surface of the copper foil, and forms a film layer that increases the interlayer lamination performance and protects the copper surface with the participation of organic additives. During the process, copper ions dissolve Into the browning liquid system, when the copper ion is too lar...
Claims
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Application Information
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