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Aluminum environmental

Buschmann, J., Kappeler, A., Lindauer, U. et al. (2006) Arsenite and arsenate binding to dissolved humic acids influence of pH, type of humic acid, and aluminum. Environmental Science and Technology, 40(19), 6015-20. [Pg.203]

Health Canada (1998) Aluminum, Environmental Health Program. [Pg.654]

Cooling coils were installed on the loading and support push-rods to protect frame electronics and load cells from high-temperatures. An aluminum environmental chamber, connected to the push-rods by a bellows assembly, was used to maintain a controlled environment. Test frames were connected to a back-up-power supply system to provide uninterrupted power during the event of a ptower failure. [Pg.85]

Dean has reported on a U.S. verification study of the ISO methodology. This study was conducted over a 4-year time period at five exposure sites and with four materials (steel, copper, zinc, and aluminum). Environmental data were used to obtain the ISO corrosivity classes, and these estimates were then compared to the corrosion classes obtained by direct coupon measurement. Overall, agreement was found in 58 percent of the cases studied. In 22 percent of the cases the estimated corrosion class was lower than the measured, and... [Pg.73]

Environmental Considerations. Environmental problems in Ziegler chemistry alcohol processes are not severe. A small quantity of aluminum alkyl wastes is usually produced and represents the most significant disposal problem. It can be handled by controlled hydrolysis and separate disposal of the aqueous and organic streams. Organic by-products produced in chain growth and hydrolysis can be cleanly burned. Wastewater streams must be monitored for dissolved carbon, such as short-chain alcohols, and treated conventionally when necessary. [Pg.457]

Environmental Aspects. More than two-thirds of aluminum cans are recaptured and returned for recycling into more cans. Because of the heat of melting, the use of post-consumer recycled cans is safe for beverage contents. Not only does recycling save on mass of materials, it also saves the energy of manufacture from aluminum ore (see Recycling, nonferrous metals). [Pg.450]

The alkylation of phenol with an alkene using either acid or aluminum catalysis probably accounts for 95% of the commercially produced alkylphenols with alkyl groups of three carbons or larger. The alkenes are commercially available and environmentally kind. They do not produce by-products as do alkylations which use alcohols or alkyl haUdes. Together with an acid catalyst and the appropriate amount of phenol, mono-, di-, and trialkylphenols can be produced. [Pg.59]

Scrap that is unsuitable for recycling into products by the primary aluminum producers is used in the secondary aluminum industry for castings that have modest property requirements. Oxide formation and dross buildup are encountered in the secondary aluminum industry, and fluxes are employed to assist in the collection of dross and removal of inclusions and gas. Such fluxes are usually mixtures of sodium and potassium chlorides. Fumes and residues from these fluxes and treatment of dross are problems of environmental and economic importance, and efforts are made to reclaim both flux and metal values in the dross. [Pg.124]

Environmental Protection. Fumes resulting from exposure of anhydrous aluminum chloride to moisture are corrosive and acidic. Collection systems should be provided to conduct aluminum chloride dusts or gases to a scmbbing device. The choice of equipment, usually one of economics, ranges from simple packed-tower scmbbers to sophisticated high energy devices such as those of a Venturi design (11). [Pg.148]

P. M. Bertsch, "Aqueous Polynuclear Aluminum Species," in G. Sposito, ed.. The Environmental Chemistry ofMluminum, GRG Press, Boca Raton, Fla., 1989, Ghapt. 4. (This is an excellent review of the Hterature on this chemistry.)... [Pg.181]

Disposal of the solutions of aluminum salts generated in the Eriedel-Crafts process presents an environmental problem unless use can be found for them as coagulants in a water treatment plant. [Pg.425]

Minor and potential new uses include flue-gas desulfurization (44,45), silver-cleaning formulations (46), thermal-energy storage (47), cyanide antidote (48), cement additive (49), aluminum-etching solutions (50), removal of nitrogen dioxide from flue gas (51), concrete-set accelerator (52), stabilizer for acrylamide polymers (53), extreme pressure additives for lubricants (54), multiple-use heating pads (55), in soap and shampoo compositions (56), and as a flame retardant in polycarbonate compositions (57). Moreover, precious metals can be recovered from difficult ores using thiosulfates (58). Use of thiosulfates avoids the environmentally hazardous cyanides. [Pg.30]

Contrary to proponents assumptions, natural dyes are not necessarily environmentally friendly. First, large amounts of plant waste would be produced because of the low dye content in plants, eg, 170 million t of waste to color the cotton volume. Also, in order to dye fabric with natural dyes, "mordants," which are usually based on heavy metals, have to be used. For example, madder is appHed with tin (Sn) or aluminum (Al). Weld is appHed with tin salts. Salts based on copper and iron can also be used. [Pg.348]

Although transformers suitable for other industrial installations are generally suitable for producing applications, certain options may be desirable— primarily due to environmental considerations. At locations subject to harsh environmental conditions, and particularly at locations subject to washdown with high-pressure hoses, non-ventilated enclosures are desirable, if not necessary. Likewise, at locations subjected to salt water and salt-laden air, it often is desirable to specify copper windings and lead wires. Most manufacturers provide standard units with aluminum windings and lead wires. Even if aluminum coils are used, it is almost always desirable to require stranded copper lead wires. This will lessen corrosion and loose terminal problems when transformers arc interconnected to the facility electrical system with copper conductors. If the transformers are to be installed outdoors in corrosive environments, cases should be of corrosion-resistant material (e.g., stainless steel) or be provided with an exterior coating suitable for the location. [Pg.541]

Substrates protected from different environmental conditions basically include the metals (steel, zinc, aluminum and copper), inorganic materials (plaster, concrete and asbestos), and organic materials (wood, wall-board, wallpaper and plastics). Metals may be surface coated to improve their workability in mechanical processing. [Pg.177]

EPA. 1988b. Effluent guidelines and standards. Aluminum forming point source category. U.S. Environmental Protection Agency. Code of Eederal Regulations. 40 CER 467. [Pg.287]

The zone elution method has been used for quantitative estimation or recovery of heavy metals in plants and vegetable juices [29], mercury (11) in river and waste waters [52], zinc in different environmental samples [46], nickel and copper in alloys [53], zirconium in Mg-Al alloys [22], cobalt, zinc, nickel, and copper in natural water and alloy samples [54], thiocyanate in spiked photogenic waste water [55], and aluminum in bauxite ores [42],... [Pg.354]

However, lithinm aluminum hydride or zinc metal and HCl (5) are required as reducing agents to reduce the thiocyanate to the thiol. These reducing agents are stoichiometric reagents and aren t environmentally acceptable at this time because of their hazardous properties and waste disposal problems on a large manufacturing scale. [Pg.136]


See other pages where Aluminum environmental is mentioned: [Pg.84]    [Pg.84]    [Pg.38]    [Pg.457]    [Pg.257]    [Pg.133]    [Pg.148]    [Pg.376]    [Pg.57]    [Pg.478]    [Pg.9]    [Pg.349]    [Pg.367]    [Pg.371]    [Pg.207]    [Pg.280]    [Pg.281]    [Pg.444]    [Pg.455]    [Pg.518]    [Pg.1137]    [Pg.1144]    [Pg.138]    [Pg.754]    [Pg.675]    [Pg.110]    [Pg.865]    [Pg.958]    [Pg.767]    [Pg.92]    [Pg.145]    [Pg.629]   
See also in sourсe #XX -- [ Pg.652 ]




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Aluminum alloys corrosion environmental influence

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