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(C) In the Bayer's process for the extraction of aluminum from bauxite,the powdered ore is digested with a concentrated solution of $NaOH$ at $473 - 5

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Sodium aluminate,Sodium silicate

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(C) In the Bayer's process for the extraction of aluminum from bauxite,the powdered ore is digested with a concentrated solution of $NaOH$ at $473 - 523 \ K$ and $35 - 36 \ bar$ pressure.$Al_2O_3 \cdot 2H_2O + 2NaOH \rightarrow 2NaAlO_2 + 3H_2O$$SiO_2 + 2NaOH \rightarrow Na_2SiO_3 + H_2O$Here,$Al_2O_3$ (alumina) dissolves to form sodium aluminate $(NaAlO_2)$ and silica $(SiO_2)$ dissolves to form sodium silicate $(Na_2SiO_3)$.Both are soluble in the reaction mixture.

$I$	$II$
$X$. Magnetic separation	$a$. $Ag_2S$
$Y$. Froth floatation	$b$. $FeCr_2O_4$
$Z$. Gravity separation	$c$. $Al_2(SiO_3)_3$

Which soluble substances are obtained when bauxite is treated with a solution of $NaOH$ at a temperature of $473 - 523 \ K$ and a pressure of $35 - 36 \ bar$?

Similar Questions

Which of the following processes does not involve heating?

An ore containing the impurity of $FeCr_2O_4$ is concentrated by

Match the method of concentration of the ore in column $I$ with the ore in column $II$ and select the correct alternate :

$I$ $II$

$X$. Magnetic separation $a$. $Ag_2S$

$Y$. Froth floatation $b$. $FeCr_2O_4$

$Z$. Gravity separation $c$. $Al_2(SiO_3)_3$

Which of the following ores is best concentrated by the froth-flotation method?

Leaching is commercially carried out for the concentration of which of the following ores?

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