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Method for recovering etching waste liquor containing copper chloride and ferric trichloride

A technology of iron trichloride corrosion and recovery method, which is applied in the direction of chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of low ratio, achieve risk reduction, convenient operation, low cost effect

Inactive Publication Date: 2009-06-24
TRIPOD WUXI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, due to the inherent problems of these technologies, the proportion of them used by the industry is not high.

Method used

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  • Method for recovering etching waste liquor containing copper chloride and ferric trichloride
  • Method for recovering etching waste liquor containing copper chloride and ferric trichloride
  • Method for recovering etching waste liquor containing copper chloride and ferric trichloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get the first etching waste liquid sample, after testing its main composition is as follows: Cu 2+ The ion concentration is 87g / L; Fe 3+ The ion concentration is 124g / L; the specific gravity of the etching waste liquid is 1.439g / cm 3 .

[0030] The first stage is the reduction stage of divalent copper ions and ferric ions.

[0031] a1. Turn on the liquid pump 1-4 (flow rate: 5L / min), pump the waste liquid in the ferric chloride waste etching liquid temporary storage barrel 1-1 into the centrifugal reactor 1-5, and the liquid level gauge 1-2 controls The amount of waste liquid in the ferric chloride waste etching liquid temporary storage barrel 1-1. When the waste liquid in the centrifugal reactor 1-5 is 50L, the Cu in the centrifugal reactor 2+ With 4350 grams, Cu 2+ Combined with 68.5mol; Fe in the centrifugal reactor 3+ With 6200 g, Fe 3+ Combined with 111mol, stop pump 1-4;

[0032] b1. The iron powder hoist 1-3 transfers the iron powder to the iron powder fe...

Embodiment 2

[0051] Get the second etching waste liquid sample, after testing its main composition is as follows: Cu 2+ The ion concentration is 94g / L; Fe 3+ The ion concentration is 118g / L; the specific gravity of the etching waste liquid is 1.422g / cm 3 .

[0052] The first stage is the reduction stage of divalent copper ions and ferric ions.

[0053] a1. Turn on the liquid pump 1-4 (flow rate: 6L / min), pump the waste liquid in the ferric chloride waste etching liquid temporary storage barrel 1-1 into the centrifugal reactor 1-5, and the liquid level gauge 1-2 controls The amount of waste liquid in the ferric chloride waste etching liquid temporary storage barrel 1-1. When the waste liquid in the centrifugal reactor 1-5 is 50L, the Cu in the centrifugal reactor 2+ With 4700 grams, Cu 2+ Combined with 74mol; Fe in the centrifugal reactor 3+ With 5900 g, Fe 3+ Combined with 105mol, stop pump 1-4;

[0054] b1. The iron powder hoist 1-3 transfers the iron powder to the iron powder fee...

Embodiment 3

[0073] Get the second etching waste liquid sample, after testing its main composition is as follows: Cu 2+ The ion concentration is 92g / L; Fe 3+ The ion concentration is 120g / L; the specific gravity of the etching waste liquid is 1.352g / cm 3 .

[0074] The first stage is the reduction stage of divalent copper ions and ferric ions.

[0075] a1. Turn on the liquid suction pump 1-4 (flow rate: 8L / min), and pump the waste liquid in the ferric chloride waste etching solution temporary storage barrel 1-1 into the centrifugal reactor 1-5, when the centrifugal reactor 1-5 When the medium waste liquid is 50L, the Cu in the centrifugal reactor 2+ With 4600 grams, Cu 2+ Combined with 72mol; Fe in the centrifugal reactor 3+ With 6000 g, Fe 3+ Combined with 107mol, stop the liquid pump 1-4 liquid pump.

[0076] b1. The iron powder hoist 1-3 transfers the iron powder to the iron powder feeder 1-6, turns on the iron powder feeder 1-6, the iron powder addition speed: 1.23kg / min, the ce...

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Abstract

The invention relates to a method for reclaiming an etching solution containing copper chloride and ferric trichloride. The method is characterized by comprising the following steps: reduction of a divalent copper ion and a ferric ion, wherein ferrous powder is added into an etching waste solution, the mol number of Fe atoms in the ferrous powder is the sum of 1.1 to 1.4 times of the mol number of Cu<2+> ions in the etching waste solution and 0.3 to 0.8 time of the mol number of Fe<3+> ions in the etching waste solution, so that Cu<2+> ions can be reduced to elemental copper, the Fe<3+> ions are converted into Fe<2+> ions, the ferrous powder is oxidized into FeCl2, and the concentration of the Fe<2+> ions in the etching waste solution is controlled to be between 190 and 250g / L; regeneration treatment, wherein copper coated ferrous precipitate is separated from the mixed solution, while the rest filtrate is added with 31 to 36 weight percent hydrochloric acid and 33 to 35 weight percent oxydol in sequence, and is introduced with air; and the mixed solution is heated to a temperature of between 100 and 150 DEG C, so that the FeCl2 is oxidized into FeCl3.

Description

technical field [0001] The invention relates to a method for treating waste liquid, in particular to a method for regenerating and recovering etching liquid containing copper chloride and ferric chloride. Background technique [0002] A printed circuit board is a substrate used to match electronic components. The function of this type of product is to connect various electronic parts with electronic circuits formed by circuit boards, and to play the functions of various electronic components to achieve the purpose of signal processing. [0003] In general, the manufacture of printed circuit boards involves quite a number of processes. First of all, the board itself can be manufactured in different ways depending on the selected substrate, including additive and subtractive methods. In addition, depending on the number of layers of the circuit board, single-sided boards, double-sided boards and multi-layer boards also require different processes and steps. Among the variou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/70C02F1/72
Inventor 王博周江伟余祥帧
Owner TRIPOD WUXI ELECTRONICS
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