The present research examines zinc femte, an industrial slag denying from the zinc working process. In this slag, as is known, there are several metals that can be easily released. The purpose of this w:ork was to study the release variations, for specific metals present in the zinc ferrite, as a function of two vanables: the pre-treatment temperature of the femte and the pH of the system in which the latter is inserted. The release of the following metals was analyzed: Fe, Zn A1 Cd, Co, Mm Cu, Ni, Cr, Na, K, Cs, Mg, Ca, Ba, Bi, Ga, In, Li, Rb, Sr, Tl, U. In particular, zinc ferrite was pre-treated at different temperatures such as: 200 °C, 400 °C, 600 °C, 800 °C e 1000 °C. Subsequently the different calcined samples were placed in distilled water or m acid solutions (of hydrochloric acid, nitric acid and aqua regia at pH=l) or in basic solution (of ammonium hydroxide at pH=ll). The systems were prepared m a ratio of 1:10, respectively, of grams of calcined ferrite and mL of the selected solution and stirred for one hour. At the end of the test, each system wras filtered and the obtained solution was analyzed by Plasma Mass spectrometry' (ICP-MS). The results obtamed defined the release conditions for each single element according to the two variables used. It is possible to say that tending to release the elements is more favored in an acid environment and above all in aqua regia. In general, it has been identified, for each element, the characteristic calcination temp era tine which favors' its release.

Study on the release conditions of the metals present in the zinc ferrite

De Luca, Pierantonio;Bernaudo, Ivano;Tagarelli, Antonio;Candamano, Sebastiano;
2018

Abstract

The present research examines zinc femte, an industrial slag denying from the zinc working process. In this slag, as is known, there are several metals that can be easily released. The purpose of this w:ork was to study the release variations, for specific metals present in the zinc ferrite, as a function of two vanables: the pre-treatment temperature of the femte and the pH of the system in which the latter is inserted. The release of the following metals was analyzed: Fe, Zn A1 Cd, Co, Mm Cu, Ni, Cr, Na, K, Cs, Mg, Ca, Ba, Bi, Ga, In, Li, Rb, Sr, Tl, U. In particular, zinc ferrite was pre-treated at different temperatures such as: 200 °C, 400 °C, 600 °C, 800 °C e 1000 °C. Subsequently the different calcined samples were placed in distilled water or m acid solutions (of hydrochloric acid, nitric acid and aqua regia at pH=l) or in basic solution (of ammonium hydroxide at pH=ll). The systems were prepared m a ratio of 1:10, respectively, of grams of calcined ferrite and mL of the selected solution and stirred for one hour. At the end of the test, each system wras filtered and the obtained solution was analyzed by Plasma Mass spectrometry' (ICP-MS). The results obtamed defined the release conditions for each single element according to the two variables used. It is possible to say that tending to release the elements is more favored in an acid environment and above all in aqua regia. In general, it has been identified, for each element, the characteristic calcination temp era tine which favors' its release.
Heavy metals; Mdustnal waste; Slag; Zinc ferrite; 2300
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/290736
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