Method for detecting gold content in K gold jewelry by fire assaying gold-adding method

A technology of gold content and fire testing, which is applied to the detection of the main amount of gold in K-gold jewelry, can solve the problems of slag removal, gold coil crushing, detection difficulties, etc., to improve accuracy, eliminate system errors, and facilitate detection work. Effect

Pending Publication Date: 2018-09-21
华津国检(深圳)金银珠宝检验中心有限公司 +1
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Problems solved by technology

It is because of the variability of metal elements in the K gold formula that it is difficult to detect. In my country, the fire test gold method is the arbitration method in GB11887, but the ordinary fire test gold method is not suitable for low content K gold (such as 14K gold, 9K gold) T

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  • Method for detecting gold content in K gold jewelry by fire assaying gold-adding method
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  • Method for detecting gold content in K gold jewelry by fire assaying gold-adding method

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Embodiment

[0020] A method for detecting gold content in K-gold jewellery, comprising the following steps:

[0021] (1) weighing

[0022] Weigh the standard gold and sample of the same quality, measure the gold content in the standard gold respectively by X-ray fluorescence spectrometry, add a certain proportion of standard gold in the sample, so that the gold content is equivalent to the gold content in the standard gold taken, and then Add standard silver equivalent to 2.5 times the quality of standard gold in the weighed standard gold and sample; wrap the weighed standard gold and sample with lead foil respectively, and roll them into spherical samples;

[0023] (2) ash blowing

[0024] Use long-handled stainless steel pliers to put the standard gold and samples wrapped in lead foil into the ash dish that has been preheated to 980°C in the ash blowing furnace, and arrange the standard gold and samples crosswise to avoid errors caused by uneven furnace temperature. The temperature is...

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Abstract

The invention relates to a method for detecting gold content in K gold jewelry by a fire assaying gold adding method. The method comprises the following steps: adding proper amounts of gold and silverto a sample, using lead as a collecting agent, oxidizing and cupelling in a porous cupel, absorbing lead oxide and impurities by the cupel, smelting the retained gold and silver to obtain precious metal balls, rolling into slices and rolling up into small rolls, placing into nitric acid, and gradually dissolving silver to obtain the mass of gold. By the gold-adding method, accuracy of the experiment and parallelism of the data can be greatly enhanced, convenience is brought to daily precious metal jewelry detection work, and smooth and successful completion of the detection work is guaranteed.

Description

technical field [0001] The invention relates to a method for detecting the main amount of gold in K-gold jewelry, in particular to a method for detecting the gold content in K-gold jewelry by a fire test gold adding method. Background technique [0002] With the continuous improvement of people's living standards, precious metal jewelry is more and more popular among consumers, especially white precious metal jewelry. At present, white precious metal jewelry on the market mainly includes platinum alloy, palladium alloy and K gold alloy jewelry. The main components of the first two types of jewelry are Pt and Pd, which belong to the Pt group elements and are white in themselves; K gold alloys are made by adding Pd or Ni to gold to make them white or light yellow. K gold has high hardness, low toughness, high brightness, not easy to deform, not easy to wear, relatively low price, fine workmanship, refreshing appearance, smooth surface and strong inner light feeling, so it has...

Claims

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Application Information

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IPC IPC(8): G01N5/00G01N23/223
CPCG01N5/00G01N23/223
Inventor 赫婷婷那勃孟建华曹维宇张伟桃崔建军
Owner 华津国检(深圳)金银珠宝检验中心有限公司
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