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Extracting Precious Metal Elements

     

The method comprises the following steps: mix the precious metal-bearing material with a mixed solution of aluminum nitrate nonahydrate and metal chloride, then obtain the liquid phase containing precious metal elements through standing and separation.

Leveraging the strong acidity and oxidizing property of the high-concentration solution of aluminum nitrate nonahydrate and chloride salts, this process can efficiently dissolve precious metal elements from secondary precious metal resources. It does not involve any volatile inorganic acids or organic solvents, thus achieving the effects of simplified process flow, reduced operational hazards and lower wastewater discharge. It boasts a high dissolution rate for precious metal elements, and can realize complete dissolution of palladium and gold within a short period of time. Compared with traditional methods such as aqua regia leaching, it has the advantages of convenient transportation, safe application, zero emission of volatile gases, etc.

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