| 11. | Comalco is the world's largest producer of alumina.
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| 12. | Alcoa is the world's biggest producer of alumina.
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| 13. | Alumina refineries produce two grade of alumina from bauxite ore.
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| 14. | Alumina refineries produce two grade of alumina from bauxite ore.
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| 15. | Worsley is one of the world's lowest cost alumina refineries.
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| 16. | Manning said the aluminum smelter will source alumina from Jamaica and Suriname.
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| 17. | The refinery exports about 750, 000 tonnes of alumina.
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| 18. | It also differs according to the amount of alumina present in it.
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| 19. | This made Hydro a significant player in bauxite mining and alumina refining.
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| 20. | After this process, aluminum can be extracted from alumina.
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