reactions involved:1.leaching of bauxite ore to prepare pure alumina.

2.refining of zirconium by van-arkel method.

3.recovery of gold after gold ore has been leached with NaCN solution.

Reactions involved -:

1. Leaching of bauxite ore to prepare pure alumina.

Four major reaction involved are-

First-


Second-



Third-



Fourth-



 

2. Refining of zirconium by van-arkel method.

Involve two major step-

First-
At a temperature of 895 K

 Zr+ 2 I2 →  ZrI4

Second-
At a  temperature of 2070K

ZrI4 → Zr(s) + 2I2

3. Recovery of gold after gold ore has been leached with NaCN solution



Involve two major step-

First-
Au + 8 NaCN + O2 + 2 H2O → 4 Na[Au(CN)2] + 4 NaOH

Second-
2 Na[Au(CN)2] + Zn  → 2Au + Na2[Zn(CN)4]



 

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