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What is an alumina?

What is an alumina? Here are some definitions.

Noun
  1. Aluminum oxide used especially in mining, material sciences and ceramics.
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It is among the world's leading producers of bauxite and alumina, which are exported to Canada, Norway, and the United States.
And the unstable alumina distribution in the electrolyte furtherly causes larger voltage fluctuation of the cell.
Some of the alumina and iron oxide may occasionally be chemically combined, so as to form an iron spinel, or hercynite.
These products, also known as corundum, are obtained by fusing alumina or bauxite in an electric arc furnace.
If it be desired to obtain the alumina as an earthy compact precipitate, bicarbonate of soda is used instead of carbonic acid.
Quartz ought to exist in a state of hydrate, and Wavellite, not corundum, ought to be the state of alumina in granite.

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