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-
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]