Method for processing printed circuit board waste and resource reusing

A technology for printed circuit boards and wastes, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc. , The effect of reducing production costs and enriching economic benefits

Inactive Publication Date: 2008-03-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of resource waste and environmental pollution in the treatment of printed circuit board (PCB) waste or waste liquid, the present invention provides a method for the treatment of printed ci

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  • Method for processing printed circuit board waste and resource reusing
  • Method for processing printed circuit board waste and resource reusing

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[0019] Hereinafter, the present invention will be further described through embodiments in combination with the drawings.

[0020] Figure 1 is a flow chart of the recycling and utilization of the etching waste liquid of the present invention. The basic process is to neutralize the acid and alkaline etching waste liquid, and then press and filter the neutralized waste liquid to obtain a copper-containing product, which is obtained by press filtration The waste liquid is ozonized, and then the treated waste liquid is purified, and the composition of the new etching liquid is adjusted according to the composition of the new etching liquid to obtain the new etching liquid.

[0021] Ozone is used as an oxidant to regenerate the etching waste liquid of the printed circuit board. The metal in the waste liquid is separated and refined into basic chemical raw materials, and the regenerated etching waste liquid becomes a new etching liquid and is returned to the PCB manufacturer for use, th...

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Abstract

The process of treating waste from printed circuit board production and reusing resource includes the following steps: 1. neutralizing waste acid and alkaline etching solution, pressure filtering to obtain copper, treating pressure filtered waste liquid with ozone, purifying the treated waste liquid, and regulating the components to obtain new etching solution; 2. crushing and separating PCB leftover to obtain copper-rich resin and burning at high temperature to obtain copper oxide; and 3. producing stuffing for adhesive and binder with glass fiber resin obtained through separating the crushed PCB leftover. The present invention makes it possible to reduce pollution and lower PCB producing cost.

Description

technical field [0001] The invention relates to a waste treatment method of printed circuit boards, more specifically a waste treatment method of printed circuit boards and a resource recycling method. Background technique [0002] As a supporting industry of information electronics, printed circuit board (referred to as PCB) has been greatly developed in my country in recent years. The ancient town of Qiandeng in Kunshan is known as the hometown of printed circuit boards. PCB waste is mainly strong acid and strong alkaline etching waste, heavy metals, PVC waste and board scraps, etc., and the amount is huge. [0003] The three wastes produced in the printed circuit board production process mainly include: the scraps produced in the blanking and punching process account for 3%-5% of the printed circuit board production. The waste boards produced in the entire printing production process also account for about 5%. In the process of hole metallization, copper electroplating,...

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/78C01G3/02
Inventor 左玉辉刘远彬丁中海柏益尧张亚平
Owner NANJING UNIV
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