How to determine the gold content of recycled precious metal waste?

Precious metal waste refers to waste or recycled materials containing precious metals such as gold, silver, platinum, etc. Determining the gold content of precious metal waste is crucial for recycling and value assessment. The following will introduce some commonly used methods and techniques to help determine the gold content of precious metal waste.

1. Analysis of original metal content: Firstly, it is very important to analyze the original metal content. This can be achieved through chemical analysis methods, such as spark spectroscopy, X-ray fluorescence analysis, etc. These technologies can measure the content of various metal elements in the sample and determine the relative proportion of precious metals.

2. Weight loss method: This is a simple and intuitive method that can preliminarily estimate the gold content of precious metal waste. This method calculates the gold content by measuring the weight loss of precious metal waste during the heating process. Firstly, heat the waste to a high temperature to melt and evaporate the metal, and then measure the weight of the remaining non-metallic portion. By comparing the weight difference before and after heating, the metal content in the waste can be inferred.

3. Dissolution determination method: Dissolution determination method is a commonly used method for determining the content of precious metals. This method dissolves the waste in an appropriate solvent and then uses chemical analysis techniques to determine the metal content in the solution. Commonly used solvents include acids, bases, or cyanide. By appropriate reactions and measurements, the metal content in the waste can be determined.

4. X-ray diffraction method: X-ray diffraction method is a non-destructive analysis technique that can be used to determine the content and structure of metals in precious metal waste. This method uses samples to analyze the scattering and diffraction of incident X-rays, and determines the type and content of metals by analyzing the characteristic peaks of X-rays.

5. Atomic absorption spectroscopy: Atomic absorption spectroscopy is a common analytical technique, which can be used to determine the metal content in precious metal waste. This method utilizes the characteristics of metal atoms absorbing light under specific wavelength illumination, and determines the content of metals by measuring the absorption intensity of light.

6. Electrochemical methods: Electrochemical methods can be used to determine the content of metals in precious metal waste, especially suitable for the determination of precious metals. Common electrochemical methods include electrochemical stripping, electrodeposition, and electrochemical analysis. By applying a current at a specific potential, metal ions can be dissolved or deposited, and the gold content can be calculated by measuring the current and time.

7. Fire test method: Fire test method is a traditional method for determining the content of precious metals. It mixes waste with specific fluxes and melts at high temperatures, causing the metal to melt and aggregate at the bottom. Then, through the cooling and separation process, metal balls or sheets containing metals can be obtained. By weighing and chemical analysis, the metal content can be determined.

8. Professional laboratory analysis: For accurate and accurate determination of gold content, samples can be sent to a professional laboratory for analysis. Laboratories usually use advanced instruments and technologies, such as mass spectrometers and atomic absorption spectrometers, to determine the content of metals in precious metal waste. These laboratories have experienced technicians who can provide accurate results.

When determining the gold content of precious metal waste, the following points need to be noted:

1. Sample representativeness: Ensure that the sample is representative and accurately reflects the overall gold content of the waste during the sampling process.

Accuracy and calibration of instruments: Use accurate instruments for analysis and regularly calibrate to ensure the accuracy and reliability of the results.

2. Standardization of experimental operations: During the analysis process, strictly follow the operating procedures and standard operating procedures to avoid operational errors affecting the results.

3. Interpretation and analysis of data: After obtaining the analysis results, it is necessary to interpret and analyze the data, and conduct a comprehensive evaluation combined with other relevant factors.

Determining the gold content of precious metal waste is a complex task that requires a combination of multiple methods and techniques for analysis. In practical operation, suitable methods should be selected and accuracy and reliability should be ensured to obtain accurate gold content results.

The above is how to determine the gold content of recycled precious metal waste in Dingfeng Precious Metal Recycling? All answers to the questions.