What are the detection methods, procedures and standards of rare earth elements in Heyuan, Guangdong Province?

Shenzhen Huarui Testing provides rare earth content, rare earth element detection, cerium oxide detection, rare earth oxalate detection method, ammonium sulfate rare earth extraction, rare earth chloride separation, nitric acid soaking and rare earth oxide element analysis. The methods provided by different regions are basically the same.

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Chemical analysis includes gravimetric method, volumetric method and spectrophotometry. Chemical analysis is widely used in production process and product inspection.

1, gravimetric method

Oxalate gravimetric method has long been used to determine the total amount of major rare earths. This method is clean and accurate in separating interference elements, and is recommended as an accurate and standard analysis method. In addition, the determination of rare earth constant humidity and ignition loss also adopts gravimetric method.

2. Volumetric analysis method

Volumetric analysis is used to determine the total amount of rare earth and cerium and the analysis of raw materials (hydrochloric acid, sulfuric acid, etc.). ) used in smelting process. Including complexometric titration (EDTA titration to determine the total amount of rare earth), redox titration (ammonium ferrous sulfate method to determine the content of cerium) and acid-base titration (to analyze the concentration of hydrochloric acid and sulfuric acid).

3. Spectrophotometric determination

Spectrophotometry is used to determine trace impurities in rare earth, such as silicon, phosphorus, chloride, sulfate and other non-metallic elements.

4, atomic absorption spectrometry analysis

In rare earth metallurgical analysis, air-acetylene and nitrous oxide-acetylene flames are often used to determine non-rare earth impurities. In a proper flame, most elements are quantitatively dissociated into atomic vapor, so it can be quantitatively determined by atomic absorption spectrometry.