Điện Tinh Luyện Kẽm từ Quặng Sunfua

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Metallurgy & Metal Processing Global Industrial Scale $45 billion

Tổng quan

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.

Quy trình hóa học

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)

Nguyên liệu thô

  • 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))

Sản phẩm cuối

  • 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.

Lưu ý an toàn

Đổi mới gần đây

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.

Quy mô sản xuất

14000000

tấn/năm

$45 billion

giá trị thị trường

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Frequently Asked Questions

What industry uses Điện Tinh Luyện Kẽm từ Quặng Sunfua?
Điện Tinh Luyện Kẽm từ Quặng Sunfua is used in the metallurgy & metal processing sector at global industrial scale scale.
What process is involved in Điện Tinh Luyện Kẽm từ Quặng Sunfua?
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 Điện Tinh Luyện Kẽm từ Quặng Sunfua?
Điện Tinh Luyện Kẽm từ Quặng Sunfua has a market value of $45 billion and annual production of 14,000,000 tons.
What is the environmental impact of Điện Tinh Luyện Kẽm từ Quặng Sunfua?
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 Điện Tinh Luyện Kẽm từ Quặng Sunfua?
The main raw materials include: Zinc sulfide concentrate (ZnS, sphalerite), Sulfuric acid (H₂SO₄), Aluminum cathodes.