from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several forms of aluminum oxide, Al2O3, occurring naturally as corundum, in a hydrated form in bauxite, and with various impurities as ruby, sapphire, and emery, used in aluminum production and in abrasives, refractories, ceramics, and electrical insulation. Also called aluminum oxide.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Aluminum oxide used especially in mining, material sciences and ceramics.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.
from The Century Dictionary and Cyclopedia
- n. The oxid of aluminium, Al2O3, the most abundant of the earths.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of various forms of aluminum oxide occurring naturally as corundum
Alcoa is also expected to benefit from the rise in alumina, a key raw material that is used to make aluminum.
"The primary reason we see gradually declining prices is the 60% increase in Chinese alumina capacity to about 22% of available world alumina supply," they wrote.
In both cases, much of the pollution comes from the waste left after alumina, which is used to manufacture aluminum, is extracted from bauxite ore.
A protective wall of dolomite and earth – 610 yards (620 meters) long, with an average height of nearly 9 feet (2.7 meters) – has been built in Kolontar to shield the area from further spills of the red sludge, a highly caustic waste produced when making alumina, which is used to make aluminum.
The suit accuses Alcoa and its agent—Canadian businessman Victor Dahdaleh —of conspiring to overcharge Alba by hundreds of millions of dollars for the purchase of thousands of tons of alumina, which is used to make aluminum.
Bauxite ore is refined into a white powder called alumina, which in turn makes the aluminum used in the world's cars and planes.
The suit, which sought monetary damages, accused Alcoa and Mr. Dahdaleh of conspiring to overcharge Alba for its purchase of thousands of tons of alumina, which is used to make aluminum.
Bauxite is refined to produce alumina, which is then smelted to produce aluminum, a metal in great demand to meet the needs of India and China's booming construction and automobile industries.
Guinea holds a third of the world's bauxite reserves, the ore refined into a white powder called alumina that in turn makes the aluminum used in cars and planes.
Bauxite is refined first into alumina, which is then made into aluminum.