Method for recovering tin in PCB production process

A production process and recovery method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sewage treatment, etc., can solve the problems of low tin content and low recovery rate in products, and achieve high tin content in products , low recycling cost, high recovery rate and high efficiency

Active Publication Date: 2021-03-30
KUNSHAN MEIYUANDA ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the type of flocculant selected, the tin content of the product is not high, the recovery rate is low, and the recovery efficiency needs to be further improved

Method used

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  • Method for recovering tin in PCB production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 provides a kind of recovery method of tin in PCB production process, it is characterized in that, comprises the steps:

[0040] Step S1, alkali pretreatment: put the tin stripping waste water generated in the PCB production process into the alkaline solution, and stir evenly;

[0041] Step S2, heavy metal treatment agent treatment: add heavy metal treatment agent and flocculant to the PCB tin stripping wastewater after alkali pretreatment in step S1, stir evenly, ultrasonicate for 15 minutes, then microwave for 10 minutes, settle, filter and separate, Washing and drying to obtain tin-rich products;

[0042] Step S3, cation exchange resin treatment: the filtrate treated in step S2 is adsorbed with a cation exchange resin for metal cations, and then separated by filtration, washed with water, and dried to obtain a tin-rich cation exchange resin;

[0043] Step S4, anti-capture: adding dilute nitric acid with a mass percent concentration of 3-5% to the tin-ric...

Embodiment 2

[0052] Embodiment 2 provides a method for recovering tin in the PCB production process, which is basically the same as Embodiment 1, except that the heavy metal treatment agent is made from the following components in parts by weight: hyperbranched sulfonic acid 6 parts of salt surfactant SHBP-1, 3.5 parts of polyphosphoric acid, and 1.5 parts of ammonium phosphate; the flocculant is made from the following components in parts by weight: 3.5 parts of amino-terminated water-soluble hyperbranched polyamide, 4.5 parts of polyferric sulfate, 3.5 parts of alum.

Embodiment 3

[0054] Embodiment 3 provides a method for recovering tin in the PCB production process, which is basically the same as Embodiment 1, except that the heavy metal treatment agent is made from the following components in parts by weight: hyperbranched sulfonic acid 6.5 parts of salt surfactant SHBP-1, 4 parts of polyphosphoric acid, and 2 parts of ammonium phosphate; the flocculant is made from the following components in parts by weight: 4 parts of amino-terminated water-soluble hyperbranched polyamide, 5 parts of polyferric sulfate, 4 parts of alum.

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Abstract

The invention discloses a method for recovering tin in a PCB production process, wherein the method is characterized by comprising the following steps: S1, carrying out alkali pretreatment; S2, treating with a heavy metal treating agent; S3, carrying out cation exchange resin treatment; and S4, carrying out inverse capture. According to the method for recovering tin in the PCB production process,tin stripping wastewater generated in the PCB production process can be treated rapidly, efficiently and safely, tin is recycled, waste is turned into wealth, the environment is protected, and the purpose of saving energy is achieved. In addition, the recovery method is high in recovery rate and efficiency, high in product tin content, free of secondary pollution, low in recovery cost, small in equipment investment, low in energy consumption and high in application and popularization value.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal recycling, in particular to a method for recycling tin in the PCB production process. Background technique [0002] PCB (printed circuit board) is the support body of electronic product components and the most basic hardware carrier in today's information society. PCB (printed circuit board) industry is the pillar industry of China's electronic information industry. increased at the same rate. In the production process of PCB, it is inevitable to use tin stripper. During the tin stripping process, when the tin content of the solution reaches a certain concentration (usually higher than 100g / L), the tin stripping ability decreases, and it is discharged from the tin stripping equipment to become a tin stripping waste liquid. Tin stripping waste liquid is a dangerous waste liquid with a very high acidity and a large amount of metal compounds such as tin, copper, iron, stabilizers, corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/62C02F1/58C02F2001/425C02F1/5236C02F1/56Y02P10/20
Inventor 雷仁华彭璟张和艳周爱成
Owner KUNSHAN MEIYUANDA ENVIRONMENTAL PROTECTION TECH
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