सल्फाइड अयस्क से जस्ते का विद्युत शोधन

इलेक्ट्रोविनिंग द्वारा उत्पादित चौथी सबसे अधिक उपभोग की जाने वाली धातु

Metallurgy & Metal Processing Global Industrial Scale $45 billion

अवलोकन

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.

रासायनिक प्रक्रिया

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)

कच्चा माल

  • 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))

अंतिम उत्पाद

  • Special high grade (SHG) zinc cathode — Galvanizing, die casting, brass, zinc oxide (99.995% Zn (4N5), LME deliverable grade)
<path stroke-linecap="round" stroke-linejoin="round" d="M12 9v3.75m-9.303 3.376c-.866 1.5.217 3.374 1.948 3.374h14.71c1.73 0 2.813-1.874 1.948-3.374L13.949 3.378c-.866-1.5-3.032-1.5-3.898 0L2.697 16.126zM12 15.75h.007v.008H12v-.008z" />

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.

सुरक्षा संबंधी विचार

हालिया नवाचार

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.

उत्पादन पैमाना

14000000

टन/वर्ष

$45 billion

बाज़ार मूल्य

%(name)s में और Metallurgy & Metal Processing

इलेक्ट्रिक आर्क फर्नेस द्वारा स्टेनलेस स्टील उत्पादन

Global Industrial Scale

उच्च-शुद्धता धातु के लिए तांबे का विद्युत शोधन

Global Industrial Scale

क्रोल प्रक्रिया द्वारा टाइटेनियम उत्पादन

Global Industrial Scale

ब्लास्ट फर्नेस में लोहे का प्रगलन

Global Industrial Scale

सतह परिष्करण के लिए विद्युत लेपन (क्रोम, निकेल, जस्ता)

Global Industrial Scale

साइनाइड लीचिंग द्वारा सोने का निष्कर्षण

Global Industrial Scale

हॉल-हेरोल्ट विद्युत अपघटन द्वारा एल्युमीनियम प्रगलन

Global Industrial Scale

Frequently Asked Questions

What industry uses सल्फाइड अयस्क से जस्ते का विद्युत शोधन?
सल्फाइड अयस्क से जस्ते का विद्युत शोधन is used in the metallurgy & metal processing sector at global industrial scale scale.
What process is involved in सल्फाइड अयस्क से जस्ते का विद्युत शोधन?
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 सल्फाइड अयस्क से जस्ते का विद्युत शोधन?
सल्फाइड अयस्क से जस्ते का विद्युत शोधन has a market value of $45 billion and annual production of 14,000,000 tons.
What is the environmental impact of सल्फाइड अयस्क से जस्ते का विद्युत शोधन?
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 सल्फाइड अयस्क से जस्ते का विद्युत शोधन?
The main raw materials include: Zinc sulfide concentrate (ZnS, sphalerite), Sulfuric acid (H₂SO₄), Aluminum cathodes.