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Method for detecting silver content in silver-containing waste liquid based on gravimetric method

A gravimetric method and silver content technology, applied in the direction of weighing by removing certain components, can solve the problems of complex operation and high equipment requirements, and achieve the effect of simple operation, low equipment requirements, and improved contact

Active Publication Date: 2021-04-30
KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method disclosed in the above-mentioned prior art can test the silver content well, the operation is complicated and requires high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for detecting silver content in silver-containing waste liquid based on gravimetry, comprising the following steps:

[0023] (1) Measure silver-containing waste liquid and place in container, add sodium hydroxide to regulate the pH of silver-containing waste liquid to be 8.5, add sodium sulfide while stirring, until the content of silver ion in the tail liquid is below 0.005g / L, Silver ion precipitation is completed, filtered, and the collected precipitate is washed to neutrality to obtain silver sulfide precipitate;

[0024] (2) Disperse 20g of zeolite particles in 100ml of deionized water, add 10g of CTAB, ultrasonically treat at 1000W for 5h, then filter and dry, redisperse the dried solid in 100ml of deionized water, and add 1g of aspartic acid, 1000rpm at room temperature Stirring process under the rotating speed of 10h, finally carry out filtration successively, dry promptly to obtain modified zeolite;

[0025] (3) Mix the silver sulfide precipitate with...

Embodiment 2

[0027] A method for detecting silver content in silver-containing waste liquid based on gravimetry, comprising the following steps:

[0028] (1) Measure silver-containing waste liquid and be placed in container, add sodium hydroxide to regulate the pH of silver-containing waste liquid to be 9.5, add sodium sulfide while stirring, until the content of silver ion in the tail liquid is below 0.005g / L, Silver ion precipitation is completed, filtered, and the collected precipitate is washed to neutrality to obtain silver sulfide precipitate;

[0029] (2) Disperse 20g of zeolite particles in 100ml of deionized water, add 15g of CTAB, ultrasonically treat at 1000W for 8h, then filter and dry, redisperse the dried solid in 100ml of deionized water, and add 3g of aspartic acid, 2000rpm at room temperature Stirring process under the rotating speed of 20h, finally carry out filtration successively, dry promptly to obtain modified zeolite;

[0030] (3) Mix the silver sulfide precipitate ...

Embodiment 3

[0032] A method for detecting silver content in silver-containing waste liquid based on gravimetry, comprising the following steps:

[0033] (1) Measure the silver-containing waste liquid and place it in the container, add sodium hydroxide to adjust the pH of the silver-containing waste liquid to 9, add sodium sulfide while stirring, until the content of silver ions in the tail liquid is below 0.005g / L, Silver ion precipitation is completed, filtered, and the collected precipitate is washed to neutrality to obtain silver sulfide precipitate;

[0034] (2) Disperse 20g of zeolite particles in 100ml of deionized water, add 11g of CTAB, ultrasonically treat at 1000W for 6h, then filter and dry, redisperse the dried solid in 100ml of deionized water, and add 2g of aspartic acid, at room temperature 1500pm Stirring process under the rotating speed of 15h, finally carry out filtration successively, dry promptly obtain modified zeolite;

[0035] (3) Mix the silver sulfide precipitate...

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Abstract

The invention discloses a method for detecting the content of silver in silver-containing waste liquid based on a gravimetric method, which comprises the following steps: weighing the silver-containing waste liquid, putting into a container, adding sodium hydroxide to adjust the pH value of the silver-containing waste liquid to 8.5-9.5, adding sodium sulfide while stirring until the content of silver ions in tail liquid is below 0.005 g / L, filtering, and washing collected precipitates to obtain silver sulfide precipitates; mixing the silver sulfide precipitate with nitric acid, heating and stirring until the silver sulfide precipitate is completely dissolved, adding the obtained dissolved solution into an adsorption column filled with modified zeolite, and adding hydrochloric acid into the adsorption column for precipitation treatment after adsorption treatment; finally, adding hydrazine hydrate into the adsorption column for a reduction reaction, and continuously introducing micro-nano bubbles into the bottom of the adsorption column in the reduction reaction process; and after the reduction is finished, taking out the solid in the adsorption column, washing for multiple times, drying, weighing, and calculating the weight of silver according to the weight difference of the modified zeolite before and after adsorption, thereby calculating the content of silver in the silver-containing waste liquid. The method is simple to operate and high in accuracy.

Description

Technical field: [0001] The invention relates to a method for measuring metal content, in particular to a method for detecting silver content in silver-containing waste liquid based on a gravimetric method. Background technique: [0002] Silver and silver-related products are widely used in electronics, electroplating, photosensitive materials, chemical industry and scientific research. Various silver-containing waste liquids are produced in various industries related to silver. In industrial production, industries that produce silver-containing waste liquids include silver electroplating, photographic industry, laboratory chemical analysis and many other fields. Among them, the photographic industry and the electroplating industry are the two main sources of soluble silver-containing waste liquid, mainly involving fixing waste liquid and electroplating waste liquid. In addition, CODcr analysis waste liquid and test waste liquid produced by chemical analysis and chemical exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04Y02P10/20
Inventor 郭振中徐涛
Owner KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH