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High-Iron-Bearing Precious Metal Alloys

     

In hydrometallurgical processes, feed materials are first converted into soluble substances with chemical solvents to facilitate subsequent separation and refining. Precious metals have extremely high chemical stability, which makes the dissolution of precious metal-bearing materials a persistent challenge in hydrometallurgy. For relatively high-grade platinum group metal (PGM)-bearing materials, the concentrated sulfuric acid digestion process is adopted to separate precious metals from base metals.

At present, the aqua regia dissolution method and the aqueous chlorination method are commonly used to dissolve precious metal-bearing materials in industrial production. However, the aqua regia dissolution method generates a large amount of nitrogen oxides (NOₓ), which causes environmental pollution. In addition, the process requires repeated evaporation to dryness to decompose nitro compounds, leading to cumbersome operating procedures.

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