Method for detecting nickel content in acid etching waste liquid

A technology of acid etching waste liquid and detection method, which is applied in the measurement of color/spectral characteristics, measurement device, preparation of test samples, etc., can solve problems such as affecting the determination of nickel impurity content, and achieve the effect of removing interference

Pending Publication Date: 2020-07-10
遂宁市瑞思科环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during this process, nickel will also form water-insoluble nickel hydroxide with hydroxide ions in the liquid caustic soda, thus affecting the determination of the nickel impurity content in the acidic etching waste liquid

Method used

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  • Method for detecting nickel content in acid etching waste liquid
  • Method for detecting nickel content in acid etching waste liquid
  • Method for detecting nickel content in acid etching waste liquid

Examples

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Effect test

Embodiment 1

[0030] In the embodiment of the present invention, the acidic etching waste liquid used in one of the etching processes in the printed circuit board (PCB) is selected, and the copper content in the used acidic etching waste liquid is about 120 g / L.

[0031] A detection method for nickel content in acidic etching waste liquid, comprising the steps of:

[0032] (1) Accurately pipette 4 parts of 5ml acidic etching waste liquid, each part of acidic etching waste liquid is pipetted into a 50ml beaker; 4 parts of acidic etching waste liquid are respectively recorded as sample 1, sample 2, sample 3 and sample 4 ;

[0033] (2) each adding 0.5ml concentration is the nickel standard solution of 100mg / L in the beaker that sample 3 and sample 4 place;

[0034] (3) in each beaker, all add 3g potassium iodide, shake up and dissolve, the sample in each beaker is constant volume in a 50ml volumetric flask, after the sample in the volumetric flask is shaken up, filter and remove the cuprous i...

Embodiment 2

[0041] In the embodiment of the present invention, the acidic etching waste liquid used in another etching process in the printed circuit board (PCB) is selected, and the copper content in the used acidic etching waste liquid is about 125 g / L.

[0042] A detection method for nickel content in acidic etching waste liquid, comprising the steps of:

[0043] (1) Accurately pipette 4 parts of 5ml acidic etching waste liquid, each part of acidic etching waste liquid is pipetted into a 50ml beaker; 4 parts of acidic etching waste liquid are respectively recorded as sample 1, sample 2, sample 3 and sample 4 ;

[0044] (2) each adding 0.5ml concentration is the nickel standard solution of 100mg / L in the beaker that sample 3 and sample 4 place;

[0045] (3) in each beaker, all add 3g potassium iodide, shake up and dissolve, the sample in each beaker is constant volume in a 50ml volumetric flask, after the sample in the volumetric flask is shaken up, filter and remove the cuprous iodide...

Embodiment 3

[0052] The addition of potassium iodide is confirmed by the following steps:

[0053] (1) Accurately pipette 5ml of acidic etching waste liquid in 4 parts of implementation case 1 in 4 beakers of 50ml, and add 0.5ml content respectively to be the nickel standard solution of 100mg / L, 4 parts of samples are respectively marked as sample 9, Sample 10, Sample 11, Sample 12;

[0054](2) Weigh 1g, 2g, 3g, and 4g of potassium iodide in the sample 9-12 in turn, add a small amount of pure water to dissolve, shake well, transfer to a 50ml volumetric flask after the reaction is complete, and dilute to constant volume;

[0055] (3) Filter the above 4 samples to obtain the clear solution, and detect the nickel content at a wavelength of 232nm with an atomic absorption spectrophotometer under a hollow cathode lamp according to the detection standard of the national standard GB / T9723-2007. At the same time, pure water was taken as a blank group to detect nickel content at a wavelength of 23...

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Abstract

The invention relates to the field of acid etching waste liquid treatment, and discloses a method for detecting nickel content in acid etching waste liquid, which comprises the following steps: (1) adding iodide into the acid etching waste liquid, so that iodide ions can reduce part of copper ions to generate cuprous iodide precipitate; (2) diluting to a constant volume, and removing the cuprous iodide precipitate to obtain a clear liquid; and (3) detecting the nickel content in the clear liquid by using an atomic absorption spectrophotometer. When the method is used for detecting the contentof nickel in the acidic etching waste liquid, iodide ions in iodide react with copper ions to generate cuprous iodide precipitates, and meanwhile, nickel ions in the waste liquid do not react with iodide ions, so that interference of copper ions in the acidic etching waste liquid on nickel content detection is removed, and measurement of the content of nickel in the waste liquid is not influenced.

Description

technical field [0001] The invention relates to the technical field of treatment of acidic etching waste liquid, in particular to a detection method for nickel content in acidic etching waste liquid. Background technique [0002] Copper-containing solutions are used in printed circuit board (PCB) manufacturing and other industries, resulting in a large amount of circuit board etching waste. The etching waste mainly includes acidic etching waste and alkaline etching waste. In the acidic etching waste liquid, the main components are chloride ions, copper ions and a small amount of chlorate ions. This waste liquid can be used to produce copper chloride dihydrate, basic copper chloride and copper oxide. When used to produce copper chloride dihydrate, according to the detection standard of impurity content in the national standard BG / T15901-1995 (chemical reagent copper chloride dihydrate (copper chloride) standard), the nickel content is one of the requirements to be controlled...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
CPCG01N21/3103G01N1/28
Inventor 王文平高阔
Owner 遂宁市瑞思科环保科技有限公司
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