In the First Stage of the Bayer Process Bauxite Is

question 77

Multiple Choice

In the first stage of the Bayer process bauxite is mixed with a strong base.What is the purpose of the strong base?

• A)Strong base dissolves the silicate constituents of the ore,leaving pure aluminum oxide as a precipitate to be collected by filtration.
• B)Strong base favors the formation of a soluble anion of the aluminum,leaving the silicates and other impurities as precipitates to be removed by filtration.
• C)Strong base dissolves the silicate constituents of the ore and precipitates the aluminum as Al(OH)₃ for collection by filtration.
• D)Strong base dissolves the silicates and aluminum constituents of the ore,allowing for the removal of any insoluble impurities by filtration and eventual precipitation of the aluminum from the filtrate.
• E)The strong base,along with HF,is used to extract the aluminum from the ore as cryolite,a compound used in the electrolytic reduction of aluminum.

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