Recovering method for copper-containing waste etching solution

Abstract

The invention discloses a recovering method for a copper-containing waste etching solution. The recovering method comprises the following steps that (1), the copper-containing waste etching solution is filtered and then conveyed into a neutralization dilution tank, the pH is adjusted to 2.6-3.5, and the copper-containing etching solution at least comprises a copper-containing acidic waste etching solution; (2), mixed liquid in the neutralization dilution tank is conveyed into a multi-level countercurrent extraction module through a first adjusting solution storage tank, an extraction agent and kerosene are added to the multi-level countercurrent extraction module, and then the multi-level countercurrent extraction is performed; (3), multi-level washing is conducted on the loaded organic phase obtained through the multi-level countercurrent extraction in the second step, and the washing water phase and the organic phase are obtained; (4), the organic phase obtained in the third step is subjected to reverse extraction, and the reverse extraction water phase and the reverse extraction organic phase are obtained; (5), the reverse extraction water phase obtained in the fourth step is subjected to oil-water separation, and the water phase and the oil phase are obtained; and (6), the water phase obtained in the fifth step is subjected to electrolysis from an electrolyte circulating tank to an electrolytic tank; and waste electrolyte and cathode copper are obtained through the electrolysis.

Description

technical field [0001] The invention relates to a method for recycling copper-containing waste etching solution, and is specifically used for preparing cathode copper products after recycling acidic copper-containing waste etching solution. Background technique [0002] As my country's demand for electronic products continues to grow, the production of printed circuit boards (PCB) in my country has developed rapidly, which has driven local economic development and brought profound changes to human production and lifestyles. At the same time, a variety of heavy metal wastewater and organic wastewater are discharged during the PCB production process, with complex components and difficult treatment. Printed circuit boards will produce different waste water in different production stages, and the components of various waste waters are very different, and the forms of existence are also different, and the treatment methods are also different, which constitutes the production proc...

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Problems solved by technology

[0005] After the etching process in the production process of printed circuit boards, a large amount of copper-containing acidic etching waste liquid will be produced. The copper content is as high as 100-120g / L, and it also contains a large amount of chlorine radicals. If it is not disposed of properly, it will easily cause serious waste of resources and environmental pollution. Pollution

[0006] In the prior art, copper-containing acidic etching waste (also referred to as acidic copper-containing waste etching liquid) is processed and recovered at the same time after being neutralized with alkaline etching liquid (refer to Chinese patent 201210192292.4); this method makes acidic The recovery of copper-containing waste etching solution cannot be treated separately, and simultaneous recovery with alkaline etching solution will also cause incomplete treatment of acidic copper-containing waste etching solution. The entire prior art cannot achieve thorough, efficient and environmentally friendly treatment of acidic copper-containing waste etching solution High-efficiency resource treatment

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