Abstract

DALMAU, Aymeé Reyes et al. Scandium adsorption from WL residual liquor with activated carbon modified with H₃PO₄ solutions. Min. Geol. [online]. 2022, vol.38, n.3, pp. 251-265.  Epub Sep 30, 2022. ISSN 1993-8012.

Results of a virgin activated carbon oxidation effect and the same carbon, but regenerated after being declared exhausted in producing rum process, using phosphoric acid solutions of 1 mol/L and 2 mol/L concentration are presented. Consequences of chemical modification on the mechanism and degree of scandium adsorption (III) ions in the WL residual liquor of acid technology were evaluated. Textural characterization by N2 adsorption allowed verifying the microporous nature of the carbons used. The highest increase in scandium adsorption capacity was achieved by oxidizing the regenerated coal with H3PO4 at lowest concentration, with a value of 0,145 mg/g, which represented 11,8 % removal. It was demonstrated that chemical modification of activated carbon causes an increase in the adsorption capacity and thus in the scandium removal due to the creation of specific interactions with the adsorbent material. Treatment of WL waste liquor with activated carbon constitutes a part from a way to recover scandium for financial purposes, an alternative to mitigate the environmental pollution caused by this waste.

Keywords : adsorption processes; activated carbon; chemical modification; phosphoric acid; scandium removal.

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