Electrowinning of Zinc

ZnSO₄ + H₂O → Zn + H₂SO₄ + ½O₂

Visão geral

Zinc electrowinning (electroextraction) deposits zinc metal from purified zinc sulfate solution onto aluminum cathodes. The cathode deposit is stripped every 24–48 hours and melted into zinc ingots. The regenerated sulfuric acid is recycled to leach more zinc ore. About 90% of the world's zinc is produced by this hydrometallurgical route.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Water H₂O	1	(l)
Produto	Zinc Zn	1	(s)
Produto	Sulfuric Acid H₂SO₄	1	(aq)

Exemplo do cotidiano

Zinc used in galvanized steel, brass, and zinc alloy die-castings is predominantly produced by this electrowinning process.

Importância industrial

A eletroextração produz cerca de 12 milhões de toneladas de zinco anualmente. É também utilizada para produzir cobre, cobalto, níquel e manganês. O zinco é essencial para a galvanização do aço, que representa mais de 50% do consumo global.

Propriedades

Tipo: Electrochemical
Reversível: Não
Energia: Endotérmico
ΔH: 469,0 kJ/mol

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Frequently Asked Questions

What is the equation for Electrowinning of Zinc?

The balanced equation is: ZnSO₄ + H₂O → Zn + H₂SO₄ + ½O₂.

What type of reaction is Electrowinning of Zinc?

Electrowinning of Zinc is a electrochemical reaction.

Is Electrowinning of Zinc exothermic or endothermic?

Electrowinning of Zinc is endothermic (absorbs energy). The enthalpy change (ΔH) is 469.0 kJ/mol.