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The process of extracting alumina from bauxite involves several steps. Which of the following options correctly represents the order of these steps?

Option: 1

Leaching, precipitation, calcination


Option: 2

Calcination, leaching, precipitation


Option: 3

Precipitation, leaching, calcination


Option: 4

Calcination, precipitation, leaching


Answers (1)

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The process of extracting alumina from bauxite typically involves the following steps in the correct order:

Precipitation: Bauxite is dissolved in a hot concentrated solution of sodium hydroxide (NaOH) under pressure. This process is known as the Bayer process. The aluminium hydroxide present in the bauxite precipitates out as a solid.

Leaching: The solid aluminium hydroxide is then separated from the remaining impurities by filtration. It is washed to remove any remaining impurities, leaving behind purified aluminium hydroxide.

Calcination: The purified aluminium hydroxide is heated at high temperatures in a kiln, resulting in the decomposition of aluminium hydroxide to form alumina (aluminium oxide). This step is known as calcination. 

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