alumina
noun
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Definition of alumina
: the oxide of aluminum Al2O3 occurring native as corundum and in hydrated forms (as in bauxite)
Examples of alumina in a Sentence
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Raw materials including coke, which helps to fuel iron-ore smelters, and caustic soda, used to extract alumina from bauxite, are also rocketing higher in price. — Rhiannon Hoyle, WSJ, "What Goes Around Comes Around: Energy Prices Dig Into Miners’ Profits," 12 Mar. 2018 Below that sits an alumina-zircon-silica nozzle, which can programmed to make the same intricate moves in X-, Y-, and Z-space familiar to anyone who has seen a 3D printer in action. — Jake Swearingen, Popular Mechanics, "MIT Creates a 3D Printer for Glass," 21 Aug. 2015 Bloomberg News reported that Rusal officials met Chinese companies and traders this week to discuss the possibility of buying alumina and selling aluminum in the Asian country. — David Hodari, WSJ, "Wanted: New Home for a Lot of Russian Aluminum," 20 Apr. 2018 Rusal had provided 7 percent of the world’s alumina, the raw material for aluminum production. — Eric Levitz, Daily Intelligencer, "Trump Administration Eases Sanctions on Russian Metal Giant," 23 Apr. 2018 The disruption -- playing out as U.S. sanctions on Russian aluminum giant United Co. Rusal ripples through the metal’s supply chain -- has helped send an alumina index to a five-month high. — Bloomberg.com, "Brazil Ponders Fate of Key Aluminum Ingredient Maker," 13 Apr. 2018 Such proposals often involve sulfates, particles that form in the stratosphere from sulfur dioxide ejected by volcanoes, or other molecules with high reflectivity, such as diamond dust or alumina (aluminum oxide). — Paul Voosen, Science | AAAS, "A dusting of salt could cool the planet," 21 Mar. 2018 The practice is common in aluminum production, where the smelting process uses vast amounts of electricity to create aluminum metal from alumina. — Megan Geuss, Ars Technica, "New York power companies can now charge Bitcoin miners more," 16 Mar. 2018 Bauxite is a clay rock that is refined to produce aluminum hydroxide, or alumina, which is then smelted to produce primary aluminum (secondary aluminum comes from recycled scrap). — Greg Ip, WSJ, "The Flaw in Trump’s National Security Tariffs Logic," 9 Mar. 2018These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alumina.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for alumina
alumina
noun
\
Medical Definition of alumina
: an oxide of aluminum Al2O3 that occurs native as corundum and in hydrated forms (as in bauxite) and is used in antacids
— called also
aluminum oxide
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