New methods of aluminium and aluminium-alloy chips recycling

Gronostajski, Z.; Marciniak, Henning; Matuszak, A.

doi:10.1016/s0924-0136(00)00634-8

Cited by 169 publications

(116 citation statements)

References 6 publications

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“…This observation suggests the possibility that the crystal structure of the second precipitate is similar to that of the first one although the chances of both these precipitates to have identical atomic arrangements are unlikely. Consequently, the precipitates formed in the NaOH aqueous solutions were expected to have a crystal structure close to that of bayerite and to have the composition of Al(OH) 3 .…”

Section: Xrd Analysis Of Reaction Productsmentioning

confidence: 99%

“…(f) In evaluating the conventional process, not only was the production of Al(OH) 3 based on the so-called Bayer process considered, but the hydrogen production based on steam reforming of natural gas was also taken into consideration. Table 2 lists the energy requirement and the amount of carbon dioxide emissions for producing 1.0 kg hydrogen and 26 kg Al(OH) 3 . The LCA evaluation of the conventional process concluded that the required energy was 418 MJ and the amount of carbon dioxide emissions was 18.2 kg.…”

Section: Systematic Evaluation Based On Life Cycle Assessment (Lca)mentioning

confidence: 99%

“…Since the amount of aluminum recycling is insufficient, thus we have still not a small missing, unutilized aluminum. [3][4][5][6][7] The amount of missing reaches 0.80 Mt in processes such as beverage can production and 0.77 Mt in market places. Furthermore, even if we successfully collect the used aluminum products, 0.30 Mt of dross, containing metallic aluminum as a byproduct, is released into the atmosphere during the remelting process.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Production from Waste Aluminum at Different Temperatures, with LCA

et al. 2005

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The recycling of waste metallic aluminum with high chemical exergy, which consumes a large quantity of electricity in the refining process, is insufficient. In particular, the so-called dross generated during the remelting process a part of recycling requires expensive treatment, particularly when the metallic concentration is less than 20%, before it can be landfilled. The purpose of this study is to produce hydrogen from waste aluminum sources, such as dross, using an aqueous solution of sodium hydroxide in a beaker and an autoclave. During the study, the effects of temperature of the aqueous solution on the rate of hydrogen generation are to be chiefly examined. The result obtained from an XRD analysis showed that the white product that precipitated during the experiments contained aluminum hydroxide, the rate of hydrogen generation significantly increased with the concentration of sodium hydroxide and temperature of the aqueous solution, and the activation energy was 68.4 kJ mol À1 . In the autoclave experiments, hydrogen is released quickly, along with an increase in the inner pressure to a minimum of 1.0 MPa and an increase in the temperature above 473 K. The results suggested a possibility of a new cost effective process of hydrogen production from waste aluminum along with the by prodution of sodium hydroxide. The life cycle assessment (LCA) of the proposed process for producing not only 1 kg of hydrogen but also 26 kg aluminum hydroxide from waste aluminum was carried out to assess the energy requirement and amount of carbon dioxide emissions. Results suggest that the energy requirement of our process is only 2% and the amount of carbon dioxide emissions is 4%, in comparison to a conventional method.

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Section: Xrd Analysis Of Reaction Productsmentioning

confidence: 99%

Section: Systematic Evaluation Based On Life Cycle Assessment (Lca)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen Production from Waste Aluminum at Different Temperatures, with LCA

et al. 2005

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“…The technique consists of cutting of chips to a granulated product that is then cold pressed and hot extruded or hot forged (Gronostajski et al, 2000;Gronostajski and Matuszak, 1999), (Samuel, 2003).…”

Section: Introductionmentioning

confidence: 99%

Micro-indentation based study on steel sheet degradation through forming and flattening: Toward a predictive model to assess cold recyclability

Falsafi

Demirci

2016

Materials & Design

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Article history:In Cold Roll Forming (CRF) process sheet material undergo a complex set of deformation that entail complicated through thickness residual deformation. This paper, focuses on material behaviour in CRF processes, with regarding damage and material degradation. A roll forming process is taken as case study and experimental investigation using extensive microhardness mapping alongside FE simulation of the process are the basis of material damage study. Indentation on different cross-sectional cutting angles -45, 0, 45 has been performed to study the sensitivity to orientation and crystallographic texture. A 3D Finite Element simulation with emphasis on through-thickness variation of the plastic deformation was carried out, using multiple layers of solid elements representing the sheet. A smart approach to reduce computational cost was employed in MSC.Marc by implementing simulation of a master model of complete material with shell elements, followed by partial submodelling comprising solid elements in regions of interest. This cross-sectional hardness map was then converted to the corresponding equivalent plastic strain in the cross section for validation. The correlation factor between Hardness and yield stress was discussed.

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“…For those reasons researchers are actually trying to develop recycled materials which can be produced differently than through remelting processes and will have some particularly properties. There are several examples where powder metallurgy process has been used to reuse aluminum chips [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study Of Aluminum Alloy Matrix Composite Reinforced SiC Made By Hot Pressing Method

Suśniak¹,

Karwan-Baczewska²,

Grande³

et al. 2015

Archives of Metallurgy and Materials

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The present work investigates the possibility of using powder metallurgy processing for producing a metal matrix composite. Materials were prepared from AlSi5Cu2 chips with reinforcement of 10, 15, 20 wt. % silicon carbide. Aluminum alloy chips were milled with SiC powder in a high-energy ball mill by 40 hours. Mechanical alloying process lead to obtain an uniform distribution of hard SiC particles in the metallic matrix and refine the grain size. The consolidation of composite powders was performed by vacuum hot pressing at 450 • C, under pressure of 600 MPa by 10 min. The results shows that the addition of SiC particles has a substantial influence on the microstructure and mechanical properties of composite powder as well as consolidated material. Hot pressing is an effective consolidation method which leads to obtain dense AlSi5Cu2/SiC composite with homogeneous structure and advanced mechanical properties.

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New methods of aluminium and aluminium-alloy chips recycling

Cited by 169 publications

References 6 publications

Hydrogen Production from Waste Aluminum at Different Temperatures, with LCA

Hydrogen Production from Waste Aluminum at Different Temperatures, with LCA

Micro-indentation based study on steel sheet degradation through forming and flattening: Toward a predictive model to assess cold recyclability

An Experimental Study Of Aluminum Alloy Matrix Composite Reinforced SiC Made By Hot Pressing Method

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