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Write the chemical equations involved in the preparation of elemental boron from mineral colemanite.

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Write the chemical equations involved in the preparation of elemental boron from mineral colemanite.
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`Ca_(2)B_(6)O_(11)+4SO_(2)+11H_(2)Oto2Ca(HSO_(3))_(2)+6H_(3)BO_(3)`
`2H_(3)BO_(3)overset(Delta)toB_(2)O_(3)+3H_(2)O, B_(2)O_(3)+2Al to Al_(2)O_(3)+2B`
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