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

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...

AI Technical Summary

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) There are still some difficulties in detecting

If the content of nickel and zinc in K gold jewelry is high, the texture of the gold-silver alloy gold roll will be brittle, and the gold roll will be crushed and slag-dropped during the gold separation process, which will affect the final result.

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