| 21. | Other binders that are often used include hydratable aluminas and colloidal silica.
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| 22. | Subsequently, RUSAL acquired a stake in an alumina refinery in Australia.
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| 23. | They bought new machinery, such as steam driven alumina grinding wheels.
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| 24. | It has about 17 % of the global alumina market.
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| 25. | It mines and manufactures bauxite, alumina and primary aluminium.
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| 26. | For these reasons, an alumina substrate is commonly used.
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| 27. | Ion exchange and activated alumina have been considered but not commonly used.
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| 28. | Worsley Alumina constructed a mine site and refinery in the early 1980s.
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| 29. | The pozzolanic mortar used had a high content of alumina and silica.
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| 30. | High-purity alumina bioceramics are currently commercially available from various producers.
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