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Questions and Answers
What is the main ore of aluminium?
What is the main ore of aluminium?
How is iron oxide separated from bauxite in the extraction process of aluminium?
How is iron oxide separated from bauxite in the extraction process of aluminium?
What is the chemical formula of sodium aluminate formed during the leaching process of bauxite?
What is the chemical formula of sodium aluminate formed during the leaching process of bauxite?
What are the main impurities present in bauxite ore?
What are the main impurities present in bauxite ore?
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Which method is used to separate impurities from bauxite in the extraction of aluminium?
Which method is used to separate impurities from bauxite in the extraction of aluminium?
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What temperature range is used for leaching bauxite with concentrated caustic soda in the Bayer’s method?
What temperature range is used for leaching bauxite with concentrated caustic soda in the Bayer’s method?
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Study Notes
Extraction of Aluminium
- Bauxite is the principal ore of aluminium, predominantly composed of aluminium oxide minerals.
- During the extraction process, iron oxide is separated from bauxite through the Bayer process, which involves crushing and mixing bauxite with sodium hydroxide.
- The chemical formula of sodium aluminate formed during the leaching process is NaAlO2.
Impurities in Bauxite
- Common impurities in bauxite ore include silica, iron oxides, titanium dioxide, and other minerals.
- The Bayer process is employed to efficiently separate impurities from bauxite, primarily through the use of caustic soda.
Leaching Conditions
- The leaching of bauxite with concentrated caustic soda typically occurs within a temperature range of 140 to 240 degrees Celsius, promoting the dissolution of aluminium while leaving behind impurities.
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Description
This quiz covers the extraction process of aluminium from its ore bauxite, including the concentration of bauxite ore and the subsequent extraction of aluminium metal. Learn about the abundance of aluminium in the Earth's crust and the components of bauxite ore.
