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If the iron oxide is Fe3O4 you can use a magnet.
This is possible because magnetite has strong magnetic properties.
For the separation from other iron oxides aluminium hydroxide can be dissolved in alkalis; iron oxides are not soluble in alkalis.

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What is the word equation for heating aluminium powder with iron oxide?

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How do you make iron sulfate hydroxide and oxide?

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How is aluminium metal extracted by thermite process?

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Is iron III oxide soluble in sodium hydroxide?

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What are aliminium and iron extracted from?

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What happens when iron oxide is added to sodium hydroxide solution?

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