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Method for determining thiocyanate in water containing iron-cyanogen complex in gold cyaniding process

A technology of thiocyanate and determination method, which is applied in the direction of material analysis, measurement device, and preparation of test samples by observing the influence on chemical indicators, and can solve the interference of ferricyanide complex and thiocyanate Unstable color development and other problems, to achieve the effect of increasing the absorbance value

Pending Publication Date: 2021-02-09
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a joint masking agent and a stabilizer to solve the interference problem of ferricyanide complex and the problem of unstable color development of thiocyanate

Method used

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  • Method for determining thiocyanate in water containing iron-cyanogen complex in gold cyaniding process
  • Method for determining thiocyanate in water containing iron-cyanogen complex in gold cyaniding process
  • Method for determining thiocyanate in water containing iron-cyanogen complex in gold cyaniding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Include the following steps:

[0034] Step 1, measure the volume V 1 Put 100mL of thiocyanate water sample in a 250mL beaker, add hydrochloric acid to adjust the pH to 3, add 0.1g of masking agent 1, shake well, add sodium hydroxide to adjust the pH of the solution to 7, add 0.1g of masking agent 2. Heat and boil for 20 minutes, remove and cool, and dilute to a 100mL volumetric flask;

[0035] Step 2, take a 100mL beaker, filter the above solution with quantitative filter paper, and discard the initial filtrate;

[0036] Step 3, the drawing of the standard curve

[0037] Add thiocyanate standard solution 0mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL, 5.00mL to six 50mL brown stoppered colorimetric tubes respectively, then add to six 50mL stoppered colorimetric tubes respectively Add 1mL of ethanol to dilute to the marked line with 5mL of ferric chloride color reagent, shake well, place it in a dark place for 5 minutes and measure it. At this time, the contents of thiocyanate i...

Embodiment 2

[0049] Include the following steps:

[0050] Step 1, measure the volume V 1 Put 100mL of thiocyanate water sample in a 250mL beaker, add hydrochloric acid to adjust the pH to 5, add 0.1g of ferrous sulfate, shake well, add sodium hydroxide to adjust the pH of the solution to 8, add 0.1g of zinc sulfate , heating and boiling time is 20min, remove and cool, and set the volume to 100mL volumetric flask;

[0051] Step 2, take a 100mL beaker, filter the above solution with quantitative filter paper, and discard the initial filtrate;

[0052] Step 3, the drawing of the standard curve

[0053]Add thiocyanate standard solution 0mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL, 5.00mL to six 50mL brown stoppered colorimetric tubes respectively, then add to six 50mL stoppered colorimetric tubes respectively Add 1mL of ethanol to dilute to the marked line with 5mL of ferric chloride color reagent, shake well, place it in a dark place for 5 minutes and measure it. At this time, the contents of thioc...

Embodiment 3

[0065] Including the following steps:

[0066] Step 1, measure the volume V 1 Put 100mL of thiocyanate water sample in a 250mL beaker, add hydrochloric acid to adjust the pH to 4, add 0.1g of masking agent 1, shake well, add sodium hydroxide to adjust the pH of the solution to 7.5, add 0.1g of masking agent 2, Heat and boil for 20 minutes, remove and cool, and dilute to 100mL volumetric flask;

[0067] Step 2, take a 100mL beaker, filter the above solution with quantitative filter paper, and discard the initial filtrate;

[0068] Step 3, the drawing of the standard curve

[0069] Add thiocyanate standard solution 0mL, 0.50mL, 1.00mL, 2.00mL, 3.00mL, 5.00mL to six 50mL brown stoppered colorimetric tubes respectively, then add to six 50mL stoppered colorimetric tubes respectively Add 1mL of ethanol to dilute to the marked line with 5mL of ferric chloride color reagent, shake well, place it in a dark place for 5 minutes and measure it. At this time, the contents of thiocyanate...

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Abstract

The invention relates to a method for determining thiocyanate in water containing an iron-cyanogen complex in a gold cyaniding process, and belongs to the technical field of thiocyanate determination.The method comprises the following steps: adjusting a sample solution to be acidic, adding 0.1 g of ferrous sulfate to form iron ferrocyanide precipitate, adjusting to be alkaline, adding 0.1 g of zinc sulfate to flocculate the precipitate, heating to boil for 20 minutes, taking down, cooling, fixing the volume to a 100mL volumetric flask, performing dry filtration, taking a proper volume of testsolution, and determining the content of thiocyanate by adopting an iron salt colorimetric method. Aiming at the water quality containing high-content ferricyanide complex, the invention successfullyfinds out a combined masking agent for masking the ferricyanide complex, finds out an organic solvent capable of inhibiting fading of thiocyanate, and solves the problem that thiocyanate in wastewater containing the ferricyanide complex cannot be accurately determined.

Description

technical field [0001] The invention belongs to the technical field of thiocyanate determination in water, and in particular relates to an accurate determination method for thiocyanate in water containing ferricyanide complexes in a gold cyanation process. Background technique [0002] At present, 80% of my country's gold production comes from the gold cyanidation process, and in the cyanidation process, due to the relatively high content of pyrite in the ore and gold ore, a large amount of cyanide will be combined with iron and iron during the cyanidation process. Sulfur reacts separately to form thiocyanate and iron cyanide complexes, which exist in large quantities in the water quality after the cyanidation process. The production of thiocyanate directly affects the cyanation efficiency in the process. At the same time, in the subsequent water quality harmless treatment process It will also cause significant interference to the determination of cyanide. Thiocyanate in water...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N21/03G01N1/28
CPCG01N21/78G01N21/31G01N21/03G01N1/28G01N2021/775
Inventor 王菊陈永红葛仲义
Owner CHANGCHUN GOLD RES INST
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