A very interesting possibility of Coal Combustion Ash (CCA) reutilization is as adsorbent material, and CCA reuse can take advantage from proper beneficiation techniques such as mechanical sieving and demineralization. In this work adsorption of cadmium was taken into consideration, with the emphasis on the intertwining among waste properties, beneficiation treatments, properties of the beneficiated materials and adsorption capacities. The physico-chemical/microstructural characterization of three solid materials (the as-received CCA, the ash sieved in the size range 0-25 m -F25-, the demineralized ash -DEM-) was thoroughly carried out by a number of methods (chemical analyses, X-ray diffraction, laser granulometry, mercury porosimetry). Cadmium adsorption kinetic tests were conducted for times ranging from 15 min to 7 d, and liquid solutions after adsorption were analyzed by atomic absorption spectrophotometry. Moreover, a pseudo-second-order kinetic model was successfully employed to obtain other relevant parameters for the sorbents investigated. Results were discussed in terms of the influence of the beneficiation treatments on the sorbents properties and of the effect of these latter on the Cd adsorption capacities, and shed light on interesting correlations among solid properties, Cd capture rate and maximum Cd uptake.

Effect of sieving/demineralization on cadmium adsorption by coal combustion ash

DI NATALE, Francesco;ERTO, ALESSANDRO;LANCIA, AMEDEO;MONTAGNARO, FABIO;SANTORO, LUCIANO
2009

Abstract

A very interesting possibility of Coal Combustion Ash (CCA) reutilization is as adsorbent material, and CCA reuse can take advantage from proper beneficiation techniques such as mechanical sieving and demineralization. In this work adsorption of cadmium was taken into consideration, with the emphasis on the intertwining among waste properties, beneficiation treatments, properties of the beneficiated materials and adsorption capacities. The physico-chemical/microstructural characterization of three solid materials (the as-received CCA, the ash sieved in the size range 0-25 m -F25-, the demineralized ash -DEM-) was thoroughly carried out by a number of methods (chemical analyses, X-ray diffraction, laser granulometry, mercury porosimetry). Cadmium adsorption kinetic tests were conducted for times ranging from 15 min to 7 d, and liquid solutions after adsorption were analyzed by atomic absorption spectrophotometry. Moreover, a pseudo-second-order kinetic model was successfully employed to obtain other relevant parameters for the sorbents investigated. Results were discussed in terms of the influence of the beneficiation treatments on the sorbents properties and of the effect of these latter on the Cd adsorption capacities, and shed light on interesting correlations among solid properties, Cd capture rate and maximum Cd uptake.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/364596
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