Question

Extraction of alumina from bauxite 4 marks answer

Answer 1

Hello there friend ,

Here is your answer ,

Baeyer's Processs ,

Bauxite is crushed , cleaned , washed

then hot , concentrated NaOH is added ,

Al2O3.2H2O + 2NaOH -----> 2NaAlO2 + 3H20

[temperature : 140 C - 150 C ; 2 to 8 hours ]

then it is cooled to 50 C ,

NaAlO2 + 2 H2O -------> NaOH + Al(OH)3

Now ,

Al(OH)3 is filtered , washed , dried and ignited at 1000C ,

2Al(OH)3 ------> Al2O3 + 3H2O

Al2O3 is Alumina

I am 100% sure about the answer ,

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