Elektrolytische Zinkraffination aus Sulfiderz

Das viertmeistkonsumierte Metall durch Elektrogewinnung

Metallurgy & Metal Processing Global Industrial Scale $45 billion

Übersicht

Zinc is the fourth most consumed metal globally, primarily produced by the roast-leach-electrowin (RLE) process from zinc sulfide (sphalerite) ore. The ore is roasted to zinc oxide, leached in sulfuric acid, and the purified zinc sulfate solution is electrolyzed to deposit high-purity zinc on aluminum cathodes. Over 85% of the world's zinc is produced by this hydrometallurgical route. Zinc's primary use is galvanizing steel (60%), followed by zinc alloys, brass, and zinc compounds.

Chemischer Prozess

Zinc sulfide concentrate is roasted in a fluidized bed at 900-950 degrees C, converting ZnS to ZnO and producing SO₂ for sulfuric acid. The calcine is leached in spent electrolyte (H₂SO₄) at 60-80 degrees C. Iron is precipitated as jarosite or goethite. The solution is purified by cementation with zinc dust to remove Cu, Cd, Co, and Ni. Purified ZnSO₄ solution is electrolyzed at 3.3-3.5 V to deposit zinc on aluminum cathodes.

2ZnS + 3O₂ →[900 degrees C] 2ZnO + 2SO₂ (roasting)
ZnO + H₂SO₄ → ZnSO₄ + H₂O (leaching)
Cathode: Zn²⁺ + 2e⁻ → Zn(s) (zinc deposition)
Anode: H₂O → ½O₂ + 2H⁺ + 2e⁻ (oxygen evolution, regenerates H₂SO₄)

Rohstoffe

  • Zinc sulfide concentrate (ZnS, sphalerite) — Flotation of zinc ore (Zinc source (50-60% Zn))
  • Sulfuric acid (H₂SO₄) — Contact process using SO₂ from roasting (Leaching acid (recycled as spent electrolyte))
  • Aluminum cathodes — Aluminum smelting (Zinc deposition substrate (peeled after 24-48 hours))

Endprodukte

  • Special high grade (SHG) zinc cathode — Galvanizing, die casting, brass, zinc oxide (99.995% Zn (4N5), LME deliverable grade)
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Environmental Impact

Zinc roasting produces SO₂ which is captured as sulfuric acid. Iron precipitation generates large volumes of jarosite or goethite residue containing entrapped impurities. Cadmium recovered during purification is a toxic heavy metal requiring careful management. However, zinc galvanizing extends steel life by 50-100 years, reducing overall metal consumption and environmental impact.

Sicherheitshinweise

Neuere Innovationen

Direct leaching of zinc sulfide concentrates using oxygen pressure leaching eliminates roasting.
Solvent extraction for zinc recovery from complex ores improves selectivity.
Zinc-air batteries for grid energy storage could create new demand.
Hot-dip galvanizing with zinc-aluminum-magnesium (ZAM) alloys provides 3-5x longer corrosion protection.

Produktionsmaßstab

14000000

Tonnen/Jahr

$45 billion

Marktwert

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Frequently Asked Questions

What industry uses Elektrolytische Zinkraffination aus Sulfiderz?
Elektrolytische Zinkraffination aus Sulfiderz is used in the metallurgy & metal processing sector at global industrial scale scale.
What process is involved in Elektrolytische Zinkraffination aus Sulfiderz?
Zinc sulfide concentrate is roasted in a fluidized bed at 900-950 degrees C, converting ZnS to ZnO and producing SO₂ for sulfuric acid. The calcine is leached in spent electrolyte (H₂SO₄) at 60-80 degrees C. Iron is precipitated as jarosite or goethite. The solution is purified by cementation with z
What is the economic significance of Elektrolytische Zinkraffination aus Sulfiderz?
Elektrolytische Zinkraffination aus Sulfiderz has a market value of $45 billion and annual production of 14,000,000 tons.
What is the environmental impact of Elektrolytische Zinkraffination aus Sulfiderz?
Zinc roasting produces SO₂ which is captured as sulfuric acid. Iron precipitation generates large volumes of jarosite or goethite residue containing entrapped impurities. Cadmium recovered during purification is a toxic heavy metal requiring careful management. However, zinc galvanizing extends stee
What raw materials are used in Elektrolytische Zinkraffination aus Sulfiderz?
The main raw materials include: Zinc sulfide concentrate (ZnS, sphalerite), Sulfuric acid (H₂SO₄), Aluminum cathodes.