Method and system for processing wastewater of cleaning printed circuit board

A printed circuit board and wastewater cleaning technology, which is applied in water/sewage treatment, water/sludge/sewage treatment, separation methods, etc., can solve the problems that operators are not easy to master, the wastewater treatment process is complicated, and the wastewater treatment equipment is huge. Achieve the effect of saving water expenses, alleviating the shortage of water resources, and remarkable effect of adsorption and filtration

Inactive Publication Date: 2008-07-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although for large-scale manufacturers, due to sufficient capital investment, it is entirely possible to treat wastewater separately according to different procedures of the wet process, and discharge them collectively after reaching the standards, but there are also complex wastewater treatment processes and huge wastewater treatment equipment, accounting for Large land area, high power consumption, high investment, difficult management, and difficult for operators to master
For small and medium-sized enterprises, it is not conducive to the promotion and application of

Method used

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  • Method and system for processing wastewater of cleaning printed circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Preparation of SiC porous ceramic filter disc

[0025] Using 100 μm silicon carbide micropowder, carbon powder, clay and potassium feldspar, wet mixing according to the mass ratio of 45:35:12:8, dry pressing, and sintering at 1240°C to obtain the SiC porous ceramic filter , The porosity is 65%, the average pore diameter is 30μm, and the pores are distributed in a three-dimensional network.

Embodiment 2

[0027] Using 10 μm silicon carbide micropowder, carbon powder, clay and potassium feldspar, wet mixing according to the mass ratio of 40:50:6:6, dry pressing, sintering at 1280 ° C to obtain the SiC porous ceramic filter , The porosity is 60%, the average pore diameter is 5μm, and the pores are distributed in a three-dimensional network.

Embodiment 3

[0029]The cleaning wastewater of the printed circuit board factory contains the contents of Ni, Cu, and Pb elements: 155ng / mL, 11410ng / mL, and 1077ng / mL, respectively, and the pH is 10. The printed circuit board cleaning wastewater treatment device used in this embodiment is: a sedimentation tank, and the wastewater treatment process after the sedimentation tank is connected with 200 mesh and 400 mesh filter screens with apertures of 74 μm and 37 μm respectively, and then connected with a three-dimensional mesh with pores. The SiC porous ceramic filter sheet of shape distribution is the first-level depth filter device and the second-level depth filter device of filter element; sheet), the secondary depth filter is 5 μm (using the SiC porous ceramic filter prepared in Example 2), the SiC porous ceramic filter is supported by a carrier, sealed with a silica gel plate gasket, and connected by a flange; There are two branches in the device, and each branch is provided with a filte...

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Abstract

The invention relates to a processing method and a system of rinsing waster water in a printed circuit board. The method carries out the solid-liquid separation of the rinsing waste water, filters the waste water to control the particles in the waste water not to be larger than 30 micron and then filters the waste water to set discharge standard through a SiC porous ceramic filter leaf. The system comprises a solid-liquid separating device, a preliminary filtering unit and a depth-type filtering unit. The preliminary filtering unit uses a filtering net or a high molecular film to be a filtering element; the depth-type filtering unit comprises a multilevel filtering unit that uses the SiC porous ceramic filter leaf as the filtering element. The set level of the filtering unit causes drained water after filtering to meet the set standard. The invention adopts the physical filter and adsorption instead of the chemical reaction, thus having remarkable absorption and filter effect of heavy metal ions without introducing other substances. With low cost, little energy consumption, simple operation, small occupied area and wide application scppe, the invention has the good application outlook and the remarkable social benefits.

Description

(1) Technical field [0001] The invention relates to a treatment method and system for cleaning waste water of printed circuit boards. (2) Background technology [0002] The production process of printed circuit boards is as follows: original board → material cutting → entire surface of material (drilling) → chemical treatment (copper plating) → dry film application → exposure → alkaline development → etching → alkaline peeling → drying → entire surface → surface coating Film bonding→temporary pressing of coating film→hot pressing→surface (electroplating)→shape processing (drilling)→processing and anti-rust treatment→inspection→packing and shipping. In the production process, a variety of chemical raw materials will be used, resulting in a wide variety of waste water with complex components and large pH changes. The waste water and waste liquid produced by cleaning in different production processes contain pollutants of different nature, including heavy metal compounds, synt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D36/00C02F1/00
Inventor 张锐王海龙陈德良许红亮卢红霞杨道媛温合静李凯邵刚李明亮马良汤胜军
Owner ZHENGZHOU UNIV
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