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Analytic method of trace gold contained in composition brass

An analytical method and technology of miscellaneous copper, applied in the field of chemical analysis, can solve the problems of high labor intensity, high analysis cost and long process.

Inactive Publication Date: 2013-04-03
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires the use of a lot of solid flux, and the process is long, the analysis cost is high, and the labor intensity is high. At the same time, a large amount of lead vapor is generated during ash blowing, which is easy to cause lead pollution.

Method used

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  • Analytic method of trace gold contained in composition brass
  • Analytic method of trace gold contained in composition brass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Weigh about 1 gram of sample into a 200mL beaker, and slowly add 50mL of 50% nitric acid solution by volume. After the violent reaction, put it on a low-temperature electric heating plate and heat it to boil, slightly boil and dissolve for about 10 minutes, then remove it and cool it down. Filter with quantitative slow filter paper, wash the beaker with deionized water, transfer all the lotion to the filter funnel, and then wash the precipitate with deionized water three times. Water, continue to heat on a low-temperature electric heating plate, slightly boiled and dissolved until the solution volume is about 5-10mL, then remove and cool, set the volume to a 100mL volumetric flask, and dry filter with a sand core funnel. The filtrate was used as a detection solution, and its absorbance was measured with an air-acetylene flame atomic absorption spectrometer, and the mass concentration of gold was calculated according to the standard working curve method.

Embodiment 2

[0010] Example 2: Weigh about 5 grams of sample into a 200mL beaker, slowly add 80mL of 50% nitric acid solution by volume. After the violent reaction, put it on a low-temperature electric heating plate and heat it to boil, slightly boil and dissolve for about 10 minutes, then remove it and cool it down. Filter with quantitative slow-speed filter paper, wash the beaker with deionized water, transfer all the lotion to the filter funnel, and then wash the precipitate with deionized water three times. , continue to heat on a low-temperature electric heating plate, slightly boil and dissolve to a solution volume of about 5-10mL, remove and cool, set the volume to a 100mL volumetric flask, and dry filter with a sand core funnel. The filtrate was used as a detection solution to measure its absorbance with an air-acetylene flame atomic absorption spectrometer, and the mass concentration of gold was calculated according to the standard working curve method.

Embodiment 3

[0011] Example 3: Weigh about 10 grams of sample into a 200 mL beaker, slowly add 100 mL of 50% nitric acid solution by volume. After the violent reaction, put it on a low-temperature electric heating plate and heat it to boil, slightly boil and dissolve for about 10 minutes, then remove it and cool it down. Filter with quantitative slow-speed filter paper, wash the beaker with deionized water, transfer all the lotion to the filter funnel, and then wash the precipitate with deionized water three times. Water, continue to heat on a low-temperature electric heating plate, slightly boiled and dissolved until the solution volume is about 5-10mL, then remove and cool, set the volume to a 100mL volumetric flask, and dry filter with a sand core funnel. The filtrate was used as a detection solution to measure its absorbance with an air-acetylene flame atomic absorption spectrometer, and the mass concentration of gold was calculated according to the standard working curve method.

[0...

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Abstract

The invention discloses an analytic method of trace gold contained in composition brass. The analytic method of the trace gold contained in the composition brass is characterized by comprising the following steps of: grinding a sample to be powdery, weighing 1-10 grams, placing into a beaker, and adding a nitric acid solution at the volume ratio of 50%; after reaction, heating, and boiling; dissolving during micro-boiling for about 10 minutes, and taking out for cooling; filtering through a quantitative low-speed filter paper, cleaning the beaker by using deionized water, and totally transferring cleaning liquid to a filter funnel; then cleaning depositions for three times by using the deionized water, and transferring the filter paper and filter residues together into the beaker used for originally dissolving the sample; adding aqua regia, and heating; dissolving during micro-boiling till the volume of the solution is about 5-10mL, and taking out for cooling; carrying out dry filtering by using a volumetric flask with the constant volume of 25-1000mL and a core funnel; measuring the light absorbance of filter liquor by using an air-acetylene flame atomic absorption spectrophotometer; and computing the mass concentration of the gold according to a standard working curve method. The method disclosed by the invention has the advantages of ideal separation effect, accurate analytic result, good reproducibility and easiness and fastness for operation; and compared with the traditional fire assay, the method has the advantages of cost conservation, equipment, namely a high-temperature furnace, a cupellation furnace, and the like, conservation, lead pollution prevention and environment friendliness.

Description

technical field [0001] The invention relates to a chemical analysis method, in particular to a chemical analysis method of trace precious metal elements. Background technique [0002] Miscellaneous copper is produced by pyromelting copper-containing waste. In addition to copper as the main component, it also includes a large number of other metals, such as: iron, lead, nickel, tin, etc., and also contains trace amounts of gold, palladium, silver and other precious metals. Due to the high price of precious metals, gold is an important pricing element in miscellaneous copper trade, and its analysis results are also one of the basis for evaluating the recovery rate of metallurgical processes, so accurate and rapid determination of gold content is of great significance. At present, the classic method of determining gold is the lead fire assay. The detection of gold in blister copper generally adopts the national standard YS / T521.3-2006, and its principle is an ancient and clas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/44
Inventor 肖红新庄艾春唐维学赖心
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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