Question

Write a balance equation conversion bauxite to pure alumina

Answer 1

The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide). Bauxite, the most important ore of aluminium, contains only 30–60% aluminium oxide (Al2O3), the rest being a mixture of silica, various iron oxides, and titanium dioxide.[1] The aluminium oxide must be purified before it can be refined to aluminium metal

Answer 2

$\huge\rm\underline\purple{Question :-}$

Write a balance equation conversion bauxite to pure alumina.

$\large{\underbrace{\sf{\red{ Required\:Solution:}}}}$

The chemical equations involved in the leaching of bauxite ore to prepare pure alumina are as follows:

$\boxed{ \sf \green{ First\: step: }}$

$Al_2O_{3(s)}+2NaOH{(aq)}+3H_2O{(l)}\underset{35-36 bar}{\xrightarrow{\text{473-523 K}}} 2Na[Al(OH)_4]{(aq)}$

$\boxed{ \sf \blue{ Second\: step: }}$

$2Na[Al(OH)_4]+CO_2{(s)}\underset{35-36 bar}{\xrightarrow{\text{473-523 K}}} Al_2O_3.xH_2O+2NaHCO_3$

$\boxed{ \sf \pink{ Third\: step: }}$

$Al_2O_3.xH_2O \overset{1407K}{\longrightarrow}</p><p></p><p>Al_2O_3+xH_2O$

✯Note:

$\orange{\underline\bold{Here,}}$

✏ $Al_2O_{3(s)}$is $\red{\underline\bold{Bauxite.}}$

✏ $2Na[Al(OH)_4]{(aq)}$ is $\red{\underline\bold{Sodium \:aluminate.}}$

✏ $Al_2O_3$ is $\red{\underline\bold{Pure \:alumina.}}$

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━