In a Jamaican bauxite processing plant, crusite ore is mixed with water to form a slurry. After chemical treatment, the aluminium hydroxide precipitates and settles at the bottom. Which separation technique is used to remove the clear liquid from above the settled solid?

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Question

In a Jamaican bauxite processing plant, crusite ore is mixed with water to form a slurry. After chemical treatment, the aluminium hydroxide precipitates and settles at the bottom. Which separation technique is used to remove the clear liquid from above the settled solid?

Accepted Answer

Decantation — Award 1 mark for identifying decantation as the technique of carefully pouring off liquid from above a settled solid. A is incorrect — filtration requires passing through a filter medium. C is incorrect — centrifugation uses spinning force and is not described in this scenario. D is incorrect — chromatography separates dissolved substances based on differential movement.

Answer

Chromatography

Answer

Filtration

Answer

Decantation

Answer

Centrifugation

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