The Experts below are selected from a list of 1539 Experts worldwide ranked by ideXlab platform
Jing Min Hong - One of the best experts on this subject based on the ideXlab platform.
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environmental and economic life cycle assessment of Aluminum silicon alloys production a case study in china
Journal of Cleaner Production, 2012Co-Authors: Jing Min Hong, Jinglan Hong, Jing Zhou, Xu XuAbstract:Abstract A coupled life cycle costing and life cycle assessment was carried out to estimate the economic and environmental impact of silicon-Aluminum alloy production. The results showed that the Aluminum alloy made from secondary Aluminum accounted for 70%–95% of the environmental benefits in most categories, except in the land occupation and economic categories, compared with the Aluminum alloy made from primary Aluminum. These findings could be attributed to the decrease in energy and raw material consumption (i.e., electricity, sodium hydroxide, petroleum coke, and charcoal consumption) and the relatively high cost of secondary Aluminum Scrap. Optimizing raw material and electricity consumption efficiency, decreasing the transport distance from raw material (e.g., bauxite and old Aluminum Scrap) buyers to suppliers, and changing the end-life treatment of red mud from landfill to road building material production are key factors in reducing the overall environmental and economic impact.
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Environmental and Economic Assessment of Recycled Aluminum Alloy Production - A Case Study of China
Advanced Materials Research, 2010Co-Authors: Jing Min Hong, Zainab Z. Ismail, Jinglan HongAbstract:A life cycle assessment was carried out to estimate the environmental and economic impacts of recycled Aluminum alloy production. The impact seen from non-carcinogens, respiratory inorganics, terrestrial ecotoxicity, global warming and non-renewable energy categories played an important role to overall environmental impacts. The impact seen from carcinogens and aquatic ecotoxicity played relatively small role, while the impact seen from the rest categories affect the environment was ignorable. Specifically, the emissions from the Aluminum and silicon production stages involved played an important role due to high energy consumption, while potential impact generated from other elements was quite small. Similarly, the cost of old Aluminum Scrap represented the dominant contribution to overall economic impacts. Accordingly, choosing natural gas based electricity production technology and improving old Aluminum Scrap consumption efficiency are the efficient way to minimize the overall environmental and economic impact, respectively.
Ibrahima Khalil Cissé - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the Behavior of Local Cooking Utensils in Tap Water, Salt Tap Water and Vegetable Oil According to the Temperature
2013Co-Authors: Mamadou Babacar Ndiaye, Sandrine Bec, Bernard Coquillet, Ibrahima Khalil CisséAbstract:In Senegal the Aluminum Scrap are mainly recycled kitchen utensils [1]. The craftsmanship poses the problem of the quality of finished products [1] especially when we know they are used for everyday cooking. Given that none of these alloys should not be used to make cooking utensils if we refer to the EN 601 standard in July 2004, which refers to this regard [1], this study aims at analyzing behavior of these alloys reconstructed in three settings (tap water, vegetable oil and salt water more than 3 grams per liter), chosen for their importance in Senegalese cuisine. Significant loss of mate- rial was observed mainly by intergranular corrosion. It would be interesting that additional studies be conducted to ex- amine the impact of the daily use of these alloys on the health of Senegalese.
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Analysis of Cooking Utensils Containing Aluminium Scrap in Senegal
2012Co-Authors: Mamadou Babacar Ndiaye, Sandrine Bec, Bernard Coquillet, Ibrahima Khalil CisséAbstract:The purpose of this study is to analyze the metallurgical quality cooking utensils containing Aluminum Scrap in Senegal. Indeed, in this country, the recycling of metallic materials is a very interesting income generating activity. A whole chain, from collection to revaluation, has been set up and operate this vein with the support of partners, for the most foreigners. For Aluminum Scrap mostly issued from the automotive industry, they are essentially recycled in cooking utensils by the technique of molding sand. A study was then proposed to analyze the reconstituted Aluminum alloy, the artisan technique and the quality of final products. This first part focuses on the quality of alloys and their mechanical properties. The results show that all the alloys have levels higher than the maximum allowed by the standard NF EN 601 (July 2004). They also proven that the finished products have a high porosity due to the low amount of water control and linked to the quality of sand. That's why our analysis allowed to propose a change in preventive than half of the sand every three (03) months.
Xu Xu - One of the best experts on this subject based on the ideXlab platform.
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environmental and economic life cycle assessment of Aluminum silicon alloys production a case study in china
Journal of Cleaner Production, 2012Co-Authors: Jing Min Hong, Jinglan Hong, Jing Zhou, Xu XuAbstract:Abstract A coupled life cycle costing and life cycle assessment was carried out to estimate the economic and environmental impact of silicon-Aluminum alloy production. The results showed that the Aluminum alloy made from secondary Aluminum accounted for 70%–95% of the environmental benefits in most categories, except in the land occupation and economic categories, compared with the Aluminum alloy made from primary Aluminum. These findings could be attributed to the decrease in energy and raw material consumption (i.e., electricity, sodium hydroxide, petroleum coke, and charcoal consumption) and the relatively high cost of secondary Aluminum Scrap. Optimizing raw material and electricity consumption efficiency, decreasing the transport distance from raw material (e.g., bauxite and old Aluminum Scrap) buyers to suppliers, and changing the end-life treatment of red mud from landfill to road building material production are key factors in reducing the overall environmental and economic impact.
Yogeshwar Sahai - One of the best experts on this subject based on the ideXlab platform.
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Chemical Interactions of Dross with Water and Water Vapor in Aluminum Scrap Remelting
Materials Transactions Jim, 2007Co-Authors: Ramesh Narayanan, Yogeshwar SahaiAbstract:Remelting of Aluminum alloys such as Used Beverage Container (UBC) is done under a cover of molten salt flux based on NaCl-KCl. After the remelting process is over, the used flux (called dross) reacts with water vapor to produce gaseous emissions. Dross is also leached by dissolving in water and subsequently crystallized to regenerate the salt flux for reuse. This leaching process also generates emissions. The calculations indicate that the trace components, such as AlN and Al 4 C 3 present the dross react with water (or water vapor) to produce NH 3 (g) and CH 4 (g) in quantities greater than HCl (g) or HF (g) generated from reactions of NaCI, KCI, and NaF with water or water vapor.
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Wetting Behavior in Aluminum-Alumina-Salt Systems
Materials Transactions Jim, 1997Co-Authors: Raja R. Roy, Yogeshwar SahaiAbstract:Wetting characteristics and interfacial properties of metal, oxide, and salt play an important role during the remelting of Aluminum Scrap. The contact angle between Aluminum and alumina immersed in molten salt, and interfacial tensions between Aluminum/alumina, Aluminum/salt, and alumina/salt are important properties in this regard. In this work, the contact angle between Aluminum and alumina immersed in molten salt, based on equimolar NaCl-KCl composition, was measured using the sessile drop method. The interfacial tension between alumina and salt was calculated from the measured value of the contact angle. The calculated change in free energy due to oxide film removal shows that the oxide film removal is not spontaneous.
Daryoush Emadi - One of the best experts on this subject based on the ideXlab platform.
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Influence of scandium on the microstructure and mechanical properties of A319 alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010Co-Authors: Daryoush Emadi, A.k. Prasada Rao, Musbah MahfoudAbstract:Recycling of Aluminum Scrap alloys by melting is gaining its importance in foundry sector. During recycling, some of the alloying elements present in Scrap alloys eventually become trace/tramp impurities in the recycled alloy. These elements could potentially affect the alloy's microstructure and hence its mechanical properties. In the present work, an attempt has been made to investigate the effect of one of such trace elements on the microstructure and mechanical properties of A319 alloy. The element chosen for the present investigation is scandium (Sc). This paper discusses the effects of the additions of trace amount of Sc on the microstructure and mechanical properties of A319 alloy in as-cast, T6 and T7 heat treated conditions.
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The role of thermal analysis in detecting impurity levels during Aluminum recycling
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: Musbah Mahfoud, A. K. Prasada Rao, Daryoush EmadiAbstract:Recycling of Aluminum Scrap has gained interest owing to its economic and ecological benefits. Unfortunately, during the collection of Scrap from a mixer of junk from various sectors it is difficult to ensure that the recycled alloy has the same chemical composition as that of already existing commercial alloys. Consequently, some of the alloying elements become trace/tramp elements in the recycled alloy. Therefore, in order to obtain high performance recycled alloys, controlling the impurity levels of the Aluminum melt is of vital importance. Normally, computer aided cooling curve analysis (CA-CCA) is used to find the relationship between cooling curve parameters, melt treatments, alloy composition, and properties. In the present study, the first differential thermal analysis (DTA) approach has been used to detect and quantify impurity elements in Scrap-like liquid Aluminum alloys.
