Production[edit]Virtually all the aluminium hydroxide used commercially is manufactured by the Bayer process[5] which involves dissolving bauxite in sodium hydroxide at temperatures up to 270 °C (518 °F). The remaining solid, which is a red mud, is separated and aluminium hydroxide is precipitated from the remaining solution. This aluminium hydroxide can be converted to alumina by calcination.This red mud is damaging to the environment and highly toxic. It is usually stored in large artificial lakes: this led to the Ajka alumina plant accident in 2010 in Hungary, killing nine people and injuring 122. The dam holding back the red mud burst, allowing it to contaminate large areas of land and waterways.[
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