A method for measuring nickel in raw gold

A determination method and titration technology, applied in the direction of chemical analysis by titration method, can solve the problem of high content of nickel without suitable detection methods, etc., and achieve the effects of being suitable for batch detection, easy process control and simple operation.

Inactive Publication Date: 2017-12-15
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 nickel in crude gold to solve the problem that there is no suitable detection method for the high conten

Method used

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  • A method for measuring nickel in raw gold
  • A method for measuring nickel in raw gold
  • A method for measuring nickel in raw gold

Examples

Experimental program
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Effect test

experiment example 1

[0102] Prepare a mixed standard solution containing 150mg of gold, 8.0mg of silver, 40mg of zinc, 250mg of copper, and 40mg of nickel, 4 parts, respectively, in 250mL beakers, add 10mL of aqua regia, and cover with a watch glass. Heat at low temperature until the sample is completely dissolved, add 1mL of sodium chloride solution, and evaporate to near dryness. Add 2mL of HCl, then evaporate to near dryness, repeat 3 times, take it off, wash the watch glass and cup wall with water, add water to 100mL, add 4mL of hydrazine hydrate solution dropwise under constant stirring, heat and boil for 30min to make the gold coagulate and precipitate. Remove and cool to room temperature. Use medium-speed quantitative filter paper to filter the test solution into a 400mL beaker, rinse the watch glass, beaker, filter paper and precipitation with water for 4 times. The residue is used for gold recovery. Place the filtrate on an electric hob and heat to evaporate to a volume of about 20mL, a...

experiment example 2

[0104]Prepare a mixed standard solution containing 300mg of gold, 8.0mg of silver, 12mg of zinc, 150mg of copper and 30mg of nickel respectively, put it in a 250mL beaker, add 10mL of aqua regia, and cover with a watch glass. Heat at low temperature until the sample is completely dissolved, add 1mL of sodium chloride solution, and evaporate to near dryness. Add 2mL of HCl, then evaporate to near dryness, repeat 3 times, take it off, wash the watch glass and cup wall with water, add water to 100mL, add 4mL of hydrazine hydrate solution dropwise under constant stirring, heat and boil for 30min to make the gold coagulate and precipitate. Remove and cool to room temperature. Use medium-speed quantitative filter paper to filter the test solution into a 400mL beaker, rinse the watch glass, beaker, filter paper and precipitation with water for 4 times. The residue is used for gold recovery. Place the filtrate on an electric hob and heat to evaporate to a volume of about 20mL, add 5...

Embodiment 3

[0106] To measure a crude gold sample with an unknown content, weigh 0.5000g of the sample, place it in a 250mL beaker, add 10mL of aqua regia, and cover with a watch glass. Heat at low temperature until the sample is completely dissolved, add 1mL of sodium chloride solution, and evaporate to near dryness. Add 2mL of HCl, then evaporate to near dryness, repeat 3 times, take it off, wash the watch glass and cup wall with water, add water to 100mL, add 4mL of hydrazine hydrate solution dropwise under constant stirring, heat and boil for 30min to make the gold coagulate and precipitate. Remove and cool to room temperature. Use medium-speed quantitative filter paper to filter the test solution into a 400mL beaker, rinse the watch glass, beaker, filter paper and precipitation with water for 4 times. The residue is used for gold recovery. Place the filtrate on an electric hob and heat to evaporate to a volume of about 20mL, add 5mL of sulfuric acid, heat until thick white smoke co...

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Abstract

The invention relates to a method for measuring nickel in raw gold, and belongs to methods for measuring the nickel content in raw gold. The method includes dissolving a specimen with nitrohydrochloric acid; precipitating and separating gold by utilizing hydrazine hydrate; performing filtration with the filter residue being used for recovering the gold; adding ammonium chloride and ammonia water into the filtrate to form an alkaline buffer system; precipitating and separating nickel by adding dimethylglyoxime into the system; adding an excessive amount of EDTA and reacting the EDTA with the nickel by adopting hexamethylenetetramine as a buffer solution; titrating the excess EDTA until an end point of a color conversion from yellow to purplish red of the solution by adopting xylenol orange as an indicator and adopting zinc chloride as a titrant; and calculating the nickel content of the raw gold. The method can accurately measure the nickel content of the raw gold, is suitable for large-scale analysis, and fills the gap of nickel content measurement methods for raw gold.

Description

technical field [0001] The invention belongs to a method for determining nickel in crude gold, and is particularly suitable for batch determination of nickel 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 and nickel. The nickel content is Ni: 0.522% to 17.1%. However, in ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 陈永红王菊芦新根颜凯刘正红
Owner CHANGCHUN GOLD RES INST
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