Agriculture Reference
In-Depth Information
2NaX + CaSO
4
=
CaX + Na
2
SO
4
↓
(leaching to the soil system)
(b) Reclamation by Acid Formers or Acids
(i) Elemental S and sulfuric acid
Elemental sulfur (S) is oxidized into sulfur dioxide and then sulfur dioxide is
formed into sulfuric acid.
2S + 3O
2
→
2SO
2
(microbial oxidation)
2SO
2
+H
2
O
→
H
2
SO
4
Sulfuric acid reacts with sodium compound as follows:
With the presence of lime
:
H
2
SO
4
+CaCO
3
= CaSO
4
+CO
2
+H
2
O
2NaX + CaSO
4
=CaX+Na
2
SO
4
↓
(leached)
Without lime
:
In this case, sodium is replaced by hydrogen.
NaX + H
2
SO
4
=HX+Na
2
SO
4
(ii) Iron sulfate
FeSO
4
+H
2
O=H
2
SO
4
+ FeO
With lime
:
H
2
SO
4
+CaCO
3
= CaSO
4
+CO
2
+H
2
O
2NaX + CaSO
4
=CaX+Na
2
SO
4
↓
(leached)
Without lime
:
NaX + H
2
SO
4
=2HX+Na
2
SO
4
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