Method for recovering copper and iron from etching waste liquid

A technology for etching waste liquid and recovering copper, which is applied to the preparation of iron compounds, iron halides, and the improvement of process efficiency. It can solve the problems of low economic value of copper and iron recovery, achieve less impurity ions, reduce the possibility, and be economical. high value effect

Pending Publication Date: 2021-08-06
3R ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for comprehensive recycling of iron and copper in the etching waste liquid containing copper and iron elements, so as to solve the problem of low economic value of copper and iron recovery in the prior art

Method used

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  • Method for recovering copper and iron from etching waste liquid
  • Method for recovering copper and iron from etching waste liquid
  • Method for recovering copper and iron from etching waste liquid

Examples

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Embodiment 1

[0032] A method for recovering copper and iron in etching waste liquid, comprising the following steps:

[0033] S1. 1kg copper-containing and iron-containing waste hydrochloric acid A 0 Chlorine gas was introduced to make the Fe in the solution 2+ Oxidation is complete, and the iron trichloride solution containing copper element is obtained;

[0034] S2 Add 4.5kg of industrial hydrochloric acid and 2kg of butyl acetate to the ferric chloride solution, oscillate and let it stand until the water phase and the organic phase are separated completely, and take the organic phase;

[0035] S3. Use 5 kg of 2% ferric chloride 9mol / L hydrochloric acid solution as a washing solution for the organic phase in S2, shake it, and let it stand until the water phase and the organic phase are separated completely, and then take the organic phase;

[0036]Add 1 kg of pure water to the S4 organic phase for back extraction, the water phase is ferric chloride with ultra-low impurity content, evap...

Embodiment 2

[0043] A method for recovering copper and iron in etching waste liquid, comprising the following steps:

[0044] S1. 2kg copper-containing and iron-containing waste hydrochloric acid sample A 0 Add appropriate amount of industrial hydrochloric acid, add oxygen and catalyst to make Fe in the solution 2+ Oxidation is complete, and the iron trichloride solution containing copper element is obtained;

[0045] S2 Get 1 kg of copper-containing ferric chloride solution and add 3 kg of the condensate in Step S7 of Example 1, 2 kg of butyl acetate, shake, leave standstill until the water phase and the organic phase are completely separated, and take the organic phase;

[0046] S3 takes the organic phase of S2 and adds 1 kg of copper-containing ferric chloride solution solution, adds 5 kg of industrial hydrochloric acid, shakes and stands until the water phase and the organic phase are completely separated, and then takes the organic phase;

[0047] The S4 organic phase is washed with...

Embodiment 3

[0055] A method for recovering copper and iron in etching waste liquid, comprising the following steps:

[0056] S1. 1kg copper-containing and iron-containing waste hydrochloric acid A 0 Pass into the chlorine gas that electrolysis produces in embodiment 1 and embodiment 2, make Fe in the solution 2+ Oxidation is complete, and the iron trichloride solution containing copper element is obtained;

[0057] S2 adds 6kg industrial hydrochloric acid, 2.5kg embodiment 2 step S6 butyl acetate with the iron trichloride solution solution containing copper element, shakes, leaves standstill until aqueous phase and organic phase delamination are complete, get organic phase;

[0058] The S3 organic phase was washed with 5 kg of the washing solution in step S4 of Example 2, shaken, and left to stand until the water phase and the organic phase were separated completely, and the organic phase was taken;

[0059] S4. Add 0.5kg condensate (the condensate produced by evaporating and concentrat...

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Abstract

The invention discloses a method for recovering copper and iron from etching waste liquid. The method comprises the following steps: oxidizing the etching waste liquid containing copper and iron elements into a ferric trichloride solution containing the copper element, adding industrial hydrochloric acid and butyl acetate for extraction, standing for layering, taking an organic phase, adding an iron-containing and acid-containing washing solution for washing the organic phase, and adding a stripping agent into the organic phase for stripping, to obtain ultralow-impurity ferric trichloride, and evaporating and concentrating to remove organic matters to obtain the high-purity ferric trichloride. The organic phase can be recycled, a water phase is extracted for multiple times until no ferric trichloride exists, a high-purity copper plate can be obtained through an electrolytic copper extraction process, and a low-copper electrolyte can be electrolyzed again through evaporation and concentration or can be used as hydrochloric acid required by extraction. The copper content of the high-purity ferric trichloride product produced by the process is lower than 5 ppm, and the high-purity ferric trichloride product can be applied to the fields of drinking water treatment, medical intermediates, analysis and testing, precise etching and the like; and the copper plate obtained by electrolysis has high purity and high value.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for separating, recycling and utilizing copper and iron in an etching waste liquid containing copper and iron elements. Background technique [0002] Etching waste liquid containing copper and iron elements is the waste produced by etching copper-containing printed circuit boards (PCBs) with ferric chloride. The waste contains a large amount of Fe 3+ , Fe 2+ 、Cu 2+ , the industry has been constantly innovating technology to recover the copper and iron in it, so as to achieve the purpose of environmental protection and resource recycling. [0003] Currently disclosed acidic etching solution treatment methods include iron replacement method, extraction-electrodeposition method, diaphragm electrolysis method and the like. The copper powder recovered by the iron replacement method has high impurity content and low economic value; the extraction-electrowinnin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10C25C1/12
CPCC01G49/10C01G49/0009C25C1/12C01P2006/80Y02P10/20
Inventor 车莹华蔓邓炳林罗恒李祁明
Owner 3R ENVIRONMENTAL TECH CO LTD
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