Definition of alumina
: the oxide of aluminum Al2O3 occurring native as corundum and in hydrated forms (as in bauxite)
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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).
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The practice is common in aluminum production, where the smelting process uses vast amounts of electricity to create aluminum metal from alumina.
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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).
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The factory would mix the ore with chemicals and heat it to separate alumina from the ore — the first step in producing raw aluminum.
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Many of the most common technologies -- such as reverse osmosis, deionization and activated alumina -- cost in the hundreds of dollars.
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In 2009, workers in the town of Pikalevo (population 22,000) began protesting after Deripaska's alumina refinery there halted production, triggering layoffs and pay cuts.
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In the smelting process, the raw material, alumina, is poured into large pots, bathed in caustic chemicals and fried with heavy electric current.
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Aluminum rose as China’s top state smelter suspends production capacity of intermediate material alumina.
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Origin and Etymology of alumina
New Latin, from Latin alumin-, alumen alum
Medical Dictionary
Learn More about alumina
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Britannica.com: Encyclopedia article about alumina
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