The key points for improving the purity of 999.9 gold jewelry are as follows:
Control of raw materials
Selecting high-purity raw materials: The quality of gold products primarily depends on the purity of the raw materials. The first step to improving the purity of 999.9 gold jewelry is to choose high-purity gold raw materials. The purity of gold products in circulation on the market ranges from 99.9% to 99.999%. To enhance the purity, it is necessary to ensure that the raw materials meet a higher standard from the source.
Cooperate with reliable suppliers: By collaborating with reputable suppliers, the purity and quality of raw materials can be guaranteed, preventing the final purity of 999.9 gold jewelry from being affected by raw material issues.
Optimization of refining process
Adopt advanced refining technologies: Advanced processes such as pyrometallurgical refining and hydrometallurgical refining can be employed. Pyrometallurgical refining utilizes high temperatures to oxidize or volatilize impurities. Commonly used equipment includes furnaces and refining furnaces. By controlling the temperature, atmosphere, and adding specific fluxes, impurities such as lead and copper can be effectively removed. Wet refining uses chemical reagents to dissolve and remove impurities. For instance, aqua regia can dissolve impurities such as silver in gold.
Breaking through technical challenges: Raising the purity of gold to an extremely high level requires advanced equipment and professional technicians. Moreover, as the purity increases by one percentage point, the difficulty and cost will increase significantly. Therefore, it is necessary to constantly overcome technical difficulties.
The detection technology is precise.
Employ multiple detection methods: Common detection methods include spectral analysis and chemical analysis. Spectral analysis methods, including atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry, can rapidly and accurately determine the content of various elements in gold, thereby determining its purity. Chemical analysis methods determine the impurity content in gold through chemical reactions and then calculate its purity. For instance, the gravimetric method can be used to determine the content of certain impurities.
Reducing detection errors: Different detection methods have their limitations. For instance, the density method has significant errors for jewelry with complex components and needs to be combined with other methods. For surface coating samples and those doped with iridium, tungsten and lead, the detection is rather difficult. It is necessary to continuously improve the detection technology to reduce errors and risks.
Strict quality control
Establish a complete system: Establishing a strict quality control system is the key to ensuring the purity of 999.9 gold jewelry. This includes conducting strict quality inspections at every stage from raw material procurement to finished product delivery.
Strengthen review and testing: Through regular internal audits and third-party testing, ensure that each batch of products meets the established quality standards, guaranteeing the stability and consistency of the purity of 999.9 gold jewelry.