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Method for analyzing and measuring typical metal in circuit board of discarded electrical equipment

A determination method and circuit board technology, applied in thermal excitation analysis, material excitation analysis, preparation of test samples, etc., can solve the problems of large amount of reagents, toxic gas generation, long digestion time, etc. Improve uniformity and ensure safety

Inactive Publication Date: 2012-06-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, when the dry digestion method digests the sample, there is a loss of metals and a large amount of toxic gas is released; the ordinary wet digestion method takes a long time to digest, uses a large amount of reagents, and generates toxic gas at the same time; although microwave digestion can effectively avoid the above problems, but at present There is no report on the specific method and effect of microwave digestion technology for processing circuit board samples

Method used

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  • Method for analyzing and measuring typical metal in circuit board of discarded electrical equipment
  • Method for analyzing and measuring typical metal in circuit board of discarded electrical equipment
  • Method for analyzing and measuring typical metal in circuit board of discarded electrical equipment

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] The invention is used to analyze the leftovers produced in the production process of a certain brand of computer circuit boards in China, and to determine the types and contents of typical metals therein.

[0029] Collect circuit board scraps as samples. Use scissors to coarsely pulverize the sample into a size of 2 cm in diameter, use a hammer mill to further pulverize the coarsely pulverized sample, repeat the quartering method 3 times for the finely pulverized sample to ensure the uniformity of the sample when sampling, and finally collect the sample to be tested fine grain.

[0030] Use an electronic balance to weigh 0.2012g of the circuit board scrap sample processed in the previous step and place it in the digestion tank; use a pipette gun to measure 7mL of nitric acid, 2mL of hydrogen peroxide and 4mL of hydrofluoric acid (the purity of the reagents used are all high-grade pure) and mix with the sample And shake to avoid the sample from adhering to the wall of t...

Embodiment 2

[0036] The invention is used to analyze the circuit board of a Japanese brand TV, and determine the types and contents of typical metals therein.

[0037] Collect a TV circuit board as a sample. Use a heat gun to remove the capacitors and resistors covered on the circuit board, use scissors to coarsely pulverize the circuit board without capacitors and resistors into a size of 2 cm in diameter, use a hammer mill to further pulverize the coarsely pulverized samples, and finely pulverize the The following samples were repeated three times for quartering to ensure the uniformity of the samples during sampling, and finally the fine particles of the samples to be tested were collected.

[0038] Use an electronic balance to weigh 0.2020g of the TV circuit board sample processed in the previous step and place it in the digestion tank; use a pipette gun to measure 7mL of nitric acid, 2mL of hydrogen peroxide and 4mL of hydrofluoric acid (the purity of the reagents used are all high-gr...

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Abstract

The invention relates to a method for analyzing and measuring typical metal in a circuit board of discarded electrical equipment and relates to the technology for pre-treating the circuit board of discarded electrical equipment and detecting and analyzing the content of the typical metal element. The method comprises the following steps: collecting a sample of the circuit board part of discarded electrical equipment and then performing the operations of surface dressing, cleaning, and rough and fine grinding on the sample; adding a proper amount of digestion reagent into the prepared sample, digesting the prepared sample by using a microwave digestion device and then extracting metal matter from the discarded circuit board; and using an inductively coupled plasma emission spectrometer to analyze the nature and quantity of the digested sample. According to the method, the operations of sample grinding and digesting are simple, the reagent consumption is less, the analysis result is accurate and reliable, the detection concentration range is wide, the technical problem of difficultly pre-treating the circuit board sample is solved, and the method is suitable for quickly identifying and accurately measuring the typical metal elements in the circuit boards of various discarded electrical products (such as televisions, refrigerators, washing machines, computers, printers, and the like) and the typical metal elements in the corner wastes generated in the circuit board production process.

Description

technical field [0001] The invention relates to a method for analyzing and measuring typical metals in waste electrical circuit boards. Background technique [0002] With the improvement of production and living standards and the acceleration of the replacement of electrical equipment, a large number of circuit boards have been discarded. There are two main sources of discarded circuit boards: one is discarded electrical appliances; the other is scraps generated during the production process of circuit boards. Due to the need for good electrical conductivity, the content and types of metal elements in the circuit board are very rich. Among them, the content of copper, nickel and other metals accounts for 5-30% of the total mass of the circuit board, which has a high recovery value; the content of elements such as chromium and arsenic in the circuit board is relatively low, and the recovery value is low. These elements will cause difficult repair if they enter the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73G01N1/28G01N1/38
Inventor 陈皓赵建夫王嘉莹吴俊杰林胜陈玲李光明
Owner TONGJI UNIV
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