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Adsorption Separation and Extraction Method

     

Adsorption Separation and Extraction Method for Precious Metals

Adsorption separation is a separation and enrichment technique where an adsorbent captures one or more components from a mixture via exchange, physical adsorption, or chemical adsorption processes—driven by electrostatic interactions, van der Waals forces, or stronger chemical bonding. This enables the target component to be separated and concentrated from the mixture. After subsequent treatments, the target substance is detached from the adsorbent to facilitate accurate quantitative analysis in follow-up steps.

Compared with fire assay and coprecipitation methods, it has become an important separation and enrichment approach for precious metals due to its simplicity of operation, environmental friendliness, and low cost. Traditional adsorbents mainly include activated carbon and ion exchange resins, whose applications in precious metal separation are relatively well-established. This article focuses on introducing new adsorbents developed in recent years, which offer higher adsorption efficiency and better selectivity.

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