Electrowinning of Zinc
ZnSO4 + H2O → Zn + H2SO4 + ½O2
概要
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.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Water H₂O | 1 | (l) |
| 生成物 | Zinc Zn | 1 | (s) |
| 生成物 | Sulfuric Acid H₂SO₄ | 1 | (aq) |
日常の例
Zinc used in galvanized steel, brass, and zinc alloy die-castings is predominantly produced by this electrowinning process.
産業上の重要性
電解採取は年間約1,200万トンの亜鉛を製造する。銅、コバルト、ニッケルにも適用される。高純度な製品が得られ、酸化還元電位を活用して不純物を除去できる。
特性
- タイプ
- Electrochemical
- 可逆的
- いいえ
- エネルギー
- 吸熱性
- ΔH
- 469.0 kJ/mol
関連する反応
Electrorefining of Copper
Alkaline Battery Discharge
Anodizing of Aluminum
Chlor-Alkali Electrolysis
Nickel-Metal Hydride Battery
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrolysis of Molten NaCl (Downs Process)
Lead-Acid Battery Discharge
Hall-Héroult Process (Aluminum Smelting)
Electrolysis of Water
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.