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A kind of assay method of thiocyanate in cyanide slag

A technology of thiocyanate and determination method, which is applied in the direction of chemical analysis, measurement device, color/spectral characteristic measurement by titration method, can solve the problem of high determination results, and achieves simple operation, easy process control, and wide measurement range. Effect

Active Publication Date: 2021-04-30
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when there is a high content of thiocyanate in the cyanide slag, the measurement result of cyanide is on the high side, so the accurate determination of the amount of thiocyanate in the cyanide slag is the premise of accurately determining the cyanide content. Therefore, it is of great significance to invent an accurate and reliable method suitable for batch detection to determine the amount of thiocyanate in cyanide slag.

Method used

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  • A kind of assay method of thiocyanate in cyanide slag
  • A kind of assay method of thiocyanate in cyanide slag
  • A kind of assay method of thiocyanate in cyanide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Weigh 1.000g of cyanide slag from a certain mine, put it in a 250mL beaker, add 100mL of sodium carbonate leaching solution, cover it with a watch glass, and heat it on a boiling water bath for 1 hour;

[0050] (2) Filter the test solution into a 400mL beaker with double-layer slow quantitative filter paper, and wash the watch glass, beaker, filter paper and precipitation with 10g / L sodium carbonate washing solution for 8 times;

[0051] (3) Add 10mL sodium thiosulfate solution to the filtrate, move it into a fume hood, add 2mL sulfuric acid solution, cover with a watch glass,

[0052] (4) Place it on a temperature-controlled electric heating plate and carefully heat it to a slight boil, and keep it in a slightly boiled state, gradually evaporate to a volume of less than 100mL, remove it and cool it to room temperature, and dilute to a 100mL volumetric flask;

[0053] (5) Take 10mL water sample in a 50mL colorimetric tube, add nitric acid to adjust the pH to 5, add ...

Embodiment 2

[0056] (1) Weigh 1.000g of cyanide slag from a certain mine, put it in a 250mL beaker, add 100mL of sodium carbonate leaching solution, cover it with a watch glass, and heat it on a boiling water bath for 1.25h;

[0057](2) Filter the test solution into a 400mL beaker with a double-layer slow quantitative filter paper, and wash the watch glass, beaker, filter paper and precipitation 9 times with a concentration of 10g / L sodium carbonate washing solution;

[0058] (3) Add 10mL of sodium thiosulfate solution to the filtrate, move it into a fume hood, add 2mL of sulfuric acid solution, cover with a watch glass, carefully heat to a slight boil on a temperature-controlled electric heating plate, and keep it in a slightly boiling state, and gradually evaporate to volume If it is less than 100mL, remove it and cool it to room temperature, and dilute to a 100mL volumetric flask;

[0059] (4) Take 20mL of water sample in a 50mL colorimetric tube, add nitric acid to adjust the pH to 6, ...

Embodiment 3

[0062] (1) Weigh 1.000g of cyanide slag from a certain mine, put it in a 250mL beaker, add 100mL of sodium carbonate leaching solution, cover it with a watch glass, and heat it on a boiling water bath for 1.5h;

[0063] (2) Filter the test solution into a 400mL beaker with double-layer slow quantitative filter paper, and wash the watch glass, beaker, filter paper and precipitation with 10g / L sodium carbonate washing solution for 10 times;

[0064] (3) Add 10mL of sodium thiosulfate solution to the filtrate, move it into a fume hood, add 2mL of sulfuric acid solution, cover with a watch glass, carefully heat to a slight boil on a temperature-controlled electric heating plate, and keep it in a slightly boiling state, and gradually evaporate to volume If it is less than 100mL, remove it and cool it to room temperature, and dilute to a 100mL volumetric flask;

[0065] (4) Take 30mL of water sample in a 50mL colorimetric tube, add nitric acid to adjust the pH to 7, add 5mL ferric n...

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Abstract

The invention relates to a method for determining thiocyanate in cyanide slag, which belongs to a method for determining thiocyanate in cyanide slag. Use sodium carbonate solution to extract the thiocyanate in the cyanide residue, filter and separate the residue, add sodium thiosulfate and sulfuric acid to the filtrate, heat it on the electric heating plate to a slight boil, separate a certain volume of the test solution, add nitric acid to adjust the pH value, add ferric nitrate solution, dilute to the mark with water and shake well. At a wavelength of 480nm, use a 10mm cuvette and use a zero-concentration blank as a reference to measure the absorbance and calculate the amount of thiocyanate. The invention is simple in operation and easy to control the process, so it is suitable for batch detection and suitable for the determination of the content of thiocyanate in cyanide slag with a content greater than 100 mg / kg.

Description

technical field [0001] The invention relates to a method for determining thiocyanate in cyanide slag, and is particularly suitable for batch determination of high-content thiocyanate. Background technique [0002] The Environmental Protection Tax Law of the People's Republic of China, which came into effect on January 1, 2018, stipulates that a tax of 1,000 yuan per ton of hazardous waste is levied. The content of cyanide in the cyanide slag produced by gold cyanide enterprises is an important factor related to whether the cyanide slag is hazardous waste. Therefore, the accurate determination of cyanide content is the most important thing related to the future development of cyanide enterprises. However, when there is a high content of thiocyanate in the cyanide slag, the measurement result of cyanide is on the high side, so the accurate determination of the amount of thiocyanate in the cyanide slag is the premise of accurately determining the cyanide content. Therefore, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N31/16
CPCG01N21/31G01N31/16G01N2021/3196
Inventor 王菊陈永红张灵芝葛仲义
Owner CHANGCHUN GOLD RES INST