Method for determining content of cyanide in electroforming process gold product by ion chromatography

A technology of ion chromatography and gold products, which is applied in the field of detection of new gold products, can solve the problems of poor stability and easy destruction of cyanide, and achieve the effects of high detection amount, improved dissolution amount, and good peak shape

Active Publication Date: 2020-05-01
NANJING INST OF PROD QUALITY INSPECTION +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, the stability of cyanide is relatively poor, for example, it is easily destroyed under strong oxidant and strong acidic conditions, and the dissolution of gold usually needs to be completed under the condition of aqua regia; in addition, gold element and cyanide ion chelation ability in gold products ( Binding constant 1*10 45 ) is very strong, and a large amount of gold that exists in the sample in the process of processing seriously affects the detection results, so the present invention has carried out a large amount of innovative research work on the technical difficulties faced in the above-mentioned actual detection process, and realized the cyanide extraction of gold products and separation, and to explore the method for determining the content of cyanide by ion chromatography suitable for this type of product, so as to fill the gap in the detection of cyanide in electroformed gold products

Method used

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  • Method for determining content of cyanide in electroforming process gold product by ion chromatography
  • Method for determining content of cyanide in electroforming process gold product by ion chromatography
  • Method for determining content of cyanide in electroforming process gold product by ion chromatography

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] Select 6 kinds of electroforming process gold product samples, two of which are cyanide-free electroforming process (No. 1#, 2#), and 4 kinds are cyanide electroforming process (3#, 4#, 5#, 6#) . Under the optimal conditions of step 2, step 3, and step 4, weigh 0.2g of the sample and pulverize it, and choose 5 kinds of reagents according to the sample dissolution of step 1, 1-SJ-1#: 50mL aqua regia solution; 1-SJ-2#: 50mL , 50% (volume ratio) aqua regia; 1-SJ-3#: 50mL concentrated hydrochloric acid (analytical pure); 1-SJ-4#: 50mL concentrated sulfuric acid (analytical pure); 1-SJ-5#: 50mL phosphoric acid ( Analytical pure); 1-SJ-6#: the mixed solution of 50mL sulfuric acid and hydrochloric acid (concentration of sulfuric acid in the mixed solution is 10wt%, concentration of hydrochloric acid is 10wt%); 1-SJ-7#: 50mL mixed reagent (40mL water, 10mL (analytically pure nitric acid), 18g sodium chloride, 5g tartaric acid); 1-SJ-8#: 50mL mixed reagent (48mL water, 2mL (ana...

example 2

[0066] Adopt six samples selected in Example 1 to carry out research experiment, take by weighing 0.2g sample pulverization, dissolve sample (1-SJ-8# described condition) according to step 1 optimal condition, step 2 separation reagent selects 5 kinds of reagents, 2-SJ-1#: ethyl acetate; 2-SJ-2#: dichloromethane; 2-SJ-3#: chloroform; 2-SJ-4#: isopropyl ether; 2-SJ-5#: mixed Reagents (30mL ethyl acetate, 35mL dichloromethane, 15mL isopropyl ether); 15mL reagent was extracted and separated, and part of the aqueous phase solution was collected. Under step one, step three, step four optimal conditions, measure the content of cyanide (in cyanide ion), the results are shown in Table 2.

[0067] Table 2. Cyanide content in electroformed gold products under different separation reagent conditions

[0068]

[0069]

[0070] The results show that the cyanide test results of the six selected separation and extraction reagents to separate the cyanide process gold product samples a...

example 3

[0072] The six samples selected in Example 1 were used for research experiments, 0.2g samples were weighed and pulverized, and the samples were dissolved successively according to the preferred conditions of step 1 and step 2, and the cyanide was separated to obtain an aqueous cyanide solution. Transfer the separated aqueous cyanide solution to a round bottom flask, add 6 different extraction reagents, 3-SJ-1#: 15mL hydrochloric acid analytically pure; 3-SJ-2#: 15mL phosphoric acid analytically pure; 3-SJ-3 #: 15g oxalic acid; 3-SJ-4#: 15g tartaric acid; 3-SJ-5#: 15g phthalic acid; 3-SJ-6#: 7g oxalic acid, 8g tartaric acid; 3-SJ-7#: 5g oxalic acid , tartaric acid 8g, o-dibenzoic acid 2g, reflux at 100°C, absorb the distilled fraction with 40mL 30g / L sodium hydroxide aqueous solution to obtain cyanide absorption solution, and dilute to 50mL with 20g / L sodium hydroxide solution ; Under the optimal condition of step 4, measure the content of cyanide (in cyanide ion), the results ...

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Abstract

The invention discloses a method for determining the content of cyanide in an electroforming process gold product by ion chromatography. The method comprises the following steps of 1) dissolving a test sample by selecting a mixed reagent of 0.1 to 10 percent nitric acid, sodium chloride and tartaric acid; 2) performing extracting and separating by selecting a mixed solvent of ethyl acetate, methylene chloride and isopropyl ether to obtain a cyanide aqueous solution; 3) distilling out hydrogen cyanide by using oxalic acid, tartaric acid and phthalic acid under the condition of boiling, performing absorbing by using 10 to 40 g / L sodium hydroxide solution to obtain sodium cyanide to be determined, and performing a blank test under the same conditions; and 4) selecting a mixed solution of sodium hydroxide, disodium edetate and ethylenediamine as a leacheate, establishing an ion chromatography test cyanide calibration work curve, and determining the content of the cyanide in the solution tobe determined. According to the method, the content of the cyanide in the electroforming process gold product can be determined accurately; the technical blank that the cyanide of the types of products cannot be determined is filled; a detection process is convenient and quick; a detection result is accurate; and the consistency is good.

Description

technical field [0001] The invention belongs to the technical field of detection of new gold products, in particular to a method for measuring the content of cyanide (calculated as cyanide ions) in gold products of electroforming technology, especially the detection of cyanide content in gold products of electroforming technology by using ion chromatography Methods. Background technique [0002] The production process of electroformed gold products is different from traditional gold products. The preparation process of such products first dissolves gold, and uses cyanide to prepare an electrolyte solution. When the electricity is turned on, gold ions are reduced to gold, and electroformed gold products are formed by continuous electrolysis. Different processing enterprises have their own unique production processes and formulas. At present, more than 70% of the production enterprises still use cyanide as the raw material for preparing electrolyte. The risk of cyanide in the ...

Claims

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Application Information

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IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 王金砖黄成张帆王亮王鑫磊曹小勇张翼金绪广周骏贵伏荣进蔡薇白志辉张爽黄文清黄杏娇杨桂群李倍
Owner NANJING INST OF PROD QUALITY INSPECTION
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