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. |