This paper described the equilibrium and the kinetic of uranium adsorption from waste water using activated carbon without/with nano-iron impregnated, applying batch method. Adsorption isotherms of uranium equilibrium are analysed with Freundlich isotherms which reveal high affinity to activated carbon impregnated with nano-iron compared to nonimpregnate. Kinetic study showed that the decisive step of the uranium adsorption process rate is the intraparticle diffusion.
Abstract. In the present paper, we have studied the intensification of the desorption process of the complex anions of uranium U(VI), from ion exchange resins under the action of the ultrasonic field. The dynamics of uranium desorption from the anionic resins Purolite A600U/3472 and PM 611 was analyzed, both in standard conditions and with ultrasounds. The use of ultrasounds leads to the substantial growth of desorption kinetics and of the uranium recovery degree. The tests for stability of the resin grains size, mechanical resistance and the capacity of loading with uranium, after the repeated action of the ultrasounds field, emphasized the physical-chemical stability of resins used in the experiment (loading capacity of untreated resin 30.36 mgU/g resin and treated in continuous ultrasonic field 30.85 mgU/g resin).
The gold recovery from secondary resources is in the spotlight due to its high economic value and as the circular economy's main objective. As a valuable secondary source, the slag resulted from the gold-bearing electrolytic mud smelting contains up to 0.8-15 k g t −1 Au and 9-13 kg t −1 Ag, respectively. The gravity separation's use to concentrate gold contained by the slag causes significantly reduced reagents and energy consumptions. The diminished reacting time and the increased recovery yield due to the augmentation of contact surface between the solid phase and the leaching reagent are other important advantages. The present contribution aims to point out that a new different type of waste such as the slag resulted from the gold-bearing electrolytic mud smelting may be capitalized using gravity separation on Gemini table and Knelson concentrator, respectively. Metal recoveries up to 90-92% Au and 46-60% Ag, respectively, were obtained on Gemini table . The contributing editor for this article was Brajendra Mishra.
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