Printed circuit board wastewater extraction process

A printed circuit board and process technology, which is applied in the field of refining water, can solve the problems of insufficient extraction of copper, etc., and achieve the effects of large-scale operation, recycling method, and low material cost

Inactive Publication Date: 2014-06-04
KUNSHAN HONGLING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper cannot be fully extracted by alkaline precipitation method

Method used

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Embodiment Construction

[0012] The invention provides a process for refining printed circuit board waste water. Since the processing technology of printed circuit boards is very complicated, the chemical reagents used in different processes are also relatively complicated. This makes even the copper with the highest content in wastewater form a variety of different forms of existence due to the use of various chemical reagents in different process stages in the printed circuit board manufacturing technology. Among them, copper in ionic state, copper in complex state and copper in chelated state are widely present.

[0013] The present invention is exactly a kind of high-efficiency process that can refine the copper of various forms, and it comprises:

[0014] 1) Stir the wastewater and adjust the pH to 6 to 6.5;

[0015] This step is different from the alkaline precipitation method, which adjusts the wastewater to be alkaline, but instead adjusts it to be acidic.

[0016] 2) adding sodium sulfide ...

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Abstract

The invention discloses a printed circuit board wastewater extraction process which comprises the following steps: adjusting the pH of the wastewater from 6 to 6.5; adding sodium sulfide to form a CuS precipitate; adding sulfuric acid to the CuS precipitate for dissolution to generate a copper sulfate solution; adding iron into the copper sulfate solution for replacement to obtain copper. By adopting the process disclosed by the invention, the copper in multiple forms in the wastewater can be extracted and appears in a form of elementary substance, and the storage and later industrial application are facilitated.

Description

technical field [0001] The present invention relates to the printed circuit board production industry, in particular to the process of refining its water. Background technique [0002] With the development of semiconductor technology and my country's opening to the outside world and economic development in recent years, the demand for electronic products continues to grow, prompting the rapid development of my country's printed circuit board (Printed Circuit Board, referred to as PCB) production, driving local Economic development, but also bring greater pollution to the environment. [0003] Printed circuit board manufacturing technology is a very complex and highly comprehensive processing technology. Printed circuit boards include rigid, flexible, and rigid-flex single-panel, double-panel, and multilayer boards. The chemical mechanical polishing (CMP) process is usually used, that is, the chemical and mechanical removal, grinding, and polishing processes are used to trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B7/00C22B15/00
CPCY02P10/20
Inventor 夏泽军
Owner KUNSHAN HONGLING ELECTRONICS
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