2021
DOI: 10.3390/su132112261
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Hydrogen-Rich Gas Produced by the Chemical Neutralization of Reactive By-Products from the Screening Processes of the Secondary Aluminum Industry

Abstract: In the framework of the industry of secondary aluminum, the chemical neutralization of highly reactive materials that come from the pre-treatment screening processes of scraps (beverage cans and domestic appliances) was investigated through experiments in aqueous alkaline solutions. Metallic aluminum-rich by-products are classified, according to EU law, as dangerous waste, as they can potentially develop flammable gases capable of forming explosive mixtures with air. In this way they cannot be disposed of in l… Show more

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Cited by 5 publications
(5 citation statements)
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“…The foaming process is achieved by combining the binder, composed of aluminosilicate, and an aqueous alkaline solution with a metal powder (aluminum, or other metals). The result is that a hydrogen-rich gas is generated and released during metal oxidation [ 9 , 10 , 11 , 12 , 13 , 14 ], leading to the formation of a porous structure that is cured [ 15 , 16 , 17 , 18 ] and stabilized with solid particles [ 19 ]. The stabilization facilitates the dispersion of the hydrogen gas in tiny bubbles and increases the strength of the thin films between them [ 20 , 21 , 22 ].…”
Section: Introductionmentioning
confidence: 99%
“…The foaming process is achieved by combining the binder, composed of aluminosilicate, and an aqueous alkaline solution with a metal powder (aluminum, or other metals). The result is that a hydrogen-rich gas is generated and released during metal oxidation [ 9 , 10 , 11 , 12 , 13 , 14 ], leading to the formation of a porous structure that is cured [ 15 , 16 , 17 , 18 ] and stabilized with solid particles [ 19 ]. The stabilization facilitates the dispersion of the hydrogen gas in tiny bubbles and increases the strength of the thin films between them [ 20 , 21 , 22 ].…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, these materials are classified by European regulations as special hazardous wastes and should not be dumped as they are [ 57 , 58 , 59 , 60 , 61 ]. Aluminum dross and scrap can be utilized with hydrogen evolution by its treatment with aqueous alkaline solutions [ 62 , 63 ], while the oxidation of magnesium waste can be performed by saline solutions, natural seawater or a simulated one (3.5 wt.% NaCl solution) [ 64 , 65 , 66 ].…”
Section: Introductionmentioning
confidence: 99%
“…Additionally, the said solid reaction by-products can be returned to the metal production cycles and, thereby, eliminate the process stages of mining, separation of aluminum or magnesium compounds from their ores, and disposal of mud that is produced in large amounts [8]. If a scenario of secondary aluminum or magnesium production by melting, refining, and casting is preferred, some amount of magnesium-and aluminum-based scrap can be used to produce hydrogen that, in turn, can be further utilized to produce energy for the furnaces of the secondary metal industry itself [9].…”
Section: Introductionmentioning
confidence: 99%