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Determination method of copper in raw gold

A measurement method and titration technology, which is applied in the direction of chemical analysis by titration method, preparation of test samples, etc., can solve the problem of no suitable detection method for high-content copper, and achieve batch detection, simple operation, and wide measurement range. Effect

Inactive Publication Date: 2018-01-12
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for measuring copper in crude gold to solve the problem that there is no suitable detection method for high copper content in crude gold, which can accurately measure the amount of copper in crude gold and is suitable for batch operation

Method used

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  • Determination method of copper in raw gold
  • Determination method of copper in raw gold
  • Determination method of copper in raw gold

Examples

Experimental program
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Embodiment 1

[0031] Include the following steps:

[0032] (1) Weigh an appropriate amount of sample and place it in a 250mL beaker, add 18mL of water and 5mL of nitric acid, cover the watch glass, heat at low temperature to slightly boil for 25min, take it off and cool slightly, slowly add 18mL of hydrochloric acid, heat to make the sample completely dissolve;

[0033] (2) Evaporate until almost dry, take it off and cool slightly, rinse the watch glass and cup wall with water, add water to 100mL in volume, shake well, heat to boil to dissolve the soluble salts, and take it off;

[0034] (3) Rinse the watch glass and cup wall with a small amount of water, slowly add 12mL of sulfurous acid under constant stirring, heat to a slight boil and keep for 25min;

[0035] (4) Wash the watch glass, filter with medium-speed quantitative filter paper by decantation, wash the beaker with hot water for 3 times, wash the filter paper and precipitate with hot water for 5 times, and then wash with (1+1) ni...

Embodiment 2

[0053] Include the following steps:

[0054] (1) Weigh an appropriate amount of sample and place it in a 250mL beaker, add 20mL of water, 5mL of nitric acid, cover the watch glass, heat at low temperature to slightly boil for 30min, take it off and cool slightly, slowly add 20mL of hydrochloric acid, heat to make the sample completely dissolve;

[0055] (2) Evaporate until almost dry, take it off and cool slightly, rinse the watch glass and cup wall with water, add water to 100mL in volume, shake well, heat to boil to dissolve the soluble salts, and take it off;

[0056] (3) Rinse the watch glass and cup wall with a small amount of water, slowly add 15mL of sulfurous acid under continuous stirring, heat to a slight boil and keep for 30min;

[0057] (4) Wash the watch glass, filter with medium-speed quantitative filter paper by decantation, wash the beaker with hot water for 4 times, wash the filter paper and precipitate with hot water for 6 times, and then wash with (1+1) nit...

Embodiment 3

[0064] Include the following steps:

[0065] (1) Weigh an appropriate amount of sample and place it in a 250mL beaker, add 22mL of water, 5mL of nitric acid, cover the watch glass, heat at low temperature to slightly boil for 35min, take it off and cool slightly, slowly add 22mL of hydrochloric acid, heat to make the sample completely dissolve;

[0066] (2) Evaporate until almost dry, take it off and cool slightly, rinse the watch glass and cup wall with water, add water to 100mL in volume, shake well, heat to boil to dissolve the soluble salts, and take it off;

[0067] (3) Rinse the watch glass and cup wall with a small amount of water, slowly add 18mL of sulfurous acid under continuous stirring, heat to a slight boil and keep for 28min;

[0068] (4) Wash the watch glass, filter with medium-speed quantitative filter paper by decantation, wash the beaker with hot water for 5 times, wash the filter paper and precipitate with hot water for 7 times, and then wash with (1+1) nit...

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Abstract

The invention discloses a determination method of copper in raw gold, and belongs to a determination method of copper in raw gold. The determination method comprises the following steps: firstly usingnitric acid to dissolve most silver in a specimen, then adding hydrochloric acid to form an aqua regia system to completely dissolve the specimen, using sulphurous acid to precipitate and separate gold, filtering, using a filter residue to recycle the gold, adding sulfuric acid in filter liquor, and evaporating until the filter liquor is approximately dry, then using sulfuric acid to dissolve a precipitate, using ammonium hydroxide to adjust until blue copper ammonia complex ions appear, adding 0.5 g of ammonium hydrogen fluoride, shaking uniformly, adding 3 g of potassium iodide, instantly using a sodium thiosulfate standard titration solution to be titrated until the solution is light yellow, adding 5 mL of a starch solution, continuously titrating until the solution is light blue, adding 0.5 to 1.0 g of potassium rhodanide, intensively shaking until blue color is deepened, then titrating until blue color justly disappears, recording the volume V1 of the consumed sodium thiosulfatestandard titration solution, and calculating the content of copper in the raw gold. The determination method has the advantages that the content of the copper in the raw gold can be accurately determined, the method is applicable to mass analysis, and meanwhile the blank of the determination method for the copper content in the raw gold is filled.

Description

technical field [0001] The invention relates to a method for measuring copper in crude gold, and is particularly suitable for batch determination of copper content in crude gold containing multiple metal impurities. Background technique [0002] In the rough gold product standard YS / T3026-2016, the melted rough gold is divided into two grades according to the mass fraction of gold, and its chemical composition should meet the requirements in Table 1. [0003] Chemical composition of crude gold after table 1 melting [0004] [0005] In the standard, only mercury and iridium are not detected. In addition, only the total amount of impurities is regulated, and the impurity elements that are regulated for detection include but are not limited to the impurity elements listed in Table 1. [0006] Through enterprise research and analysis, the common crude gold and impurity elements are: silver, copper, zinc, nickel and lead. In the detection standard, only the determination of...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/44
Inventor 颜凯刘正红
Owner CHANGCHUN GOLD RES INST
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