5. Production of boron and sodium perborate

5.1 Obtaining basic boron

Elemental boron is obtained by hot reduction of B ₂ O ₃ obtained :

• from boric acid by a highly reducing metal (Mg, Ca, alkali, Al);

• by igneous electrolysis at 1,100°C of B ₂ O ₃ and/or borates in a molten bath composed of various magnesium salts (MgCl ₂ , MgSO ₄ , MgCO ₃ ). There is in fact a reduction of the anhydride B ₂ ...