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Iodometry process of measuring gold content in high accuracy and precision

A precision and accuracy technology, applied in the field of determination of gold, can solve the problems of high cost, low work efficiency, lengthy operation, etc., and achieve the effect of short operation time, high work efficiency and good reproducibility

Active Publication Date: 2007-10-03
青海西部矿业科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Atomic absorption method, ICP method, and graphite furnace atomic photometry require a large investment, require the use of corresponding acetylene or nitrogen, and put forward high requirements for the safety and environment of use; although the results of the traditional fire assay are accurate, the operation is tedious , and produce toxic lead vapor during soot blowing, low work efficiency and high cost; malachite green and crystal violet spectrophotometry must be extracted with toxic organic reagents, and the operating conditions for color development are the same as those for the thio-Michler ketone colorimetric method. It is very harsh, and the multi-component complex is easily oxidized in the air, resulting in unstable results; the titration operation of the hydroquinone volumetric method can only be carried out completely in a warm solution.

Method used

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  • Iodometry process of measuring gold content in high accuracy and precision
  • Iodometry process of measuring gold content in high accuracy and precision
  • Iodometry process of measuring gold content in high accuracy and precision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This implementation example illustrates the method of the present invention to the assay result of low content gold in complex sample

[0049] Weigh an appropriate amount of sample according to the gold content of the sample in a porcelain evaporating dish, start from low temperature, bake in a high-temperature furnace at 550-650°C for 1-2 hours, stir 2-3 times in the middle, transfer it to a 300mL conical flask after cooling, add 30-50mL of aqua regia, heat and dissolve on a hot plate, steam to about 20mL (if it contains antimony and tungsten, add 1-2g of tartaric acid; if it contains acid-soluble silicate, add 5-10g of sodium fluoride, and boil), Cool to room temperature, dilute to 100mL with water, add 4 saturated bromine water, shake well, add 0.1 g of foamed plastic (wetted with water in advance), plug the bottle with a rubber stopper, and vibrate on a reciprocating shaker for 30-60 minutes.

[0050] Take out the gold-loaded foam plastic, wash it thoroughly with ta...

Embodiment 2

[0057] This implementation example illustrates the method of the present invention to the determination result of gold in the complex sample of medium content

[0058] Adopt national standard substance GBW07205, carry out by the operating condition of embodiment one, its measurement result is shown in Table 2

[0059] sample name

[0060] The significant difference (95% confidence level) of the method of the present invention is: ± t = | x ‾ - μ | × n s | 14.09 - 14.0 | × 8 0.21 = 1.21 , while t 95％，7 =2.36, 1.21-1 The allowable difference between laboratories for gold in ore is 1.80g·t -1 , It can be seen that the method of the present invention is satisfactor...

Embodiment 3

[0062] This implementation example illustrates the accuracy and precision of the method of the present invention for the determination of higher content gold samples

[0063] Adopt copper concentrate as test object, carry out by the operating condition of embodiment one, its measurement result is shown in Table 3

[0064] sample name

fire assay results

/ g·t -1

This method

Determination result / g·t -1

relative standard deviation

/ %

copper concentrate

199.98 (four

average result)

203.42,

198.95,

201.71,

202.55,

200.87,

199.10, average

Value: 201.10

0.90

[0065] The significant difference (95% confidence level) in this experiment is:

[0066] t = | ( ...

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Abstract

The present invention relates to gold content measuring method, and is especially iodometry process of measuring gold content in high accuracy. The iodometry process include the following steps: 1. preparing standard gold solution through weighing gold in 0.1000g, setting in a 50 ml beaker, adding aqua regia in 10 ml, heating to dissolve, adding 5 drops of 200g / l concentration potassium chloride solution, evaporating to dry in a water bath, adding 2 ml of hydrochloric acid, evaporating to dry, repeating for three times, adding 10 ml hydrochloric acid and 3-5 drops of hydrogen peroxide to dissolve, and adding water to 100 ml to form solution of gold content of 1 mg / ml; and 2. preparing standard work solution of gold content 0.1 mg / ml with the standard gold solution. The present invention is suitable for gold content detection of different kinds of gold content material.

Description

technical field [0001] The invention relates to a method for measuring gold, in particular to an effective method for improving the accuracy and precision of results in gold determination by iodometric method. Background technique [0002] Potassium iodide volumetric determination of low-impurity and high-content gold (≥100g / t or 100μg / mL) such as gold-loaded carbon, electrolyte, anode slime, etc. has a small error and is easy to operate. (The entire sample contains a total of several micrograms or tens of micrograms) The measurement results sometimes differ by as much as ten times. In addition to the factors affecting the separation of impurities and gold enrichment, most of the cases are caused by heating with hydrochloric acid in the later stage of dissolving gold with aqua regia. Part of the gold is not well kept in the trivalent state to be determined during the process of catching oxidized nitrate, either the nitrate is not completely removed (which will make the resul...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N1/28
Inventor 林大泽吴敏张永德肖云
Owner 青海西部矿业科技有限公司
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