高純度金属のための銅電解精製

電気用途のために銅を99.99%に精製する

Metallurgy & Metal Processing Global Industrial Scale $200 billion

概要

Copper electrorefining purifies blister copper (99% Cu) to cathode copper (99.99% Cu) by electrolysis in acidic copper sulfate solution. Impure copper anodes dissolve at the anode while pure copper deposits at the cathode. Precious metals (gold, silver, platinum) accumulate in the anode slime, providing a significant revenue stream. High-purity copper is essential for electrical wiring, as even small impurities dramatically increase resistivity. Global copper consumption exceeds 25 million tons annually.

化学プロセス

Blister copper anodes (99% Cu) are suspended in tanks of acidified CuSO₄ solution (180-220 g/L CuSO₄, 150-200 g/L H₂SO₄) at 60-65 degrees C. A DC current of 200-400 A/m² dissolves Cu from the anode and deposits it on thin copper starter sheets (cathodes) over 10-14 days. Impurities less noble than Cu (Fe, Ni, Zn) remain in solution; more noble metals (Au, Ag, Se, Te) fall to the tank bottom as anode slime.

Anode: Cu(impure) → Cu²⁺ + 2e⁻ (dissolution of 99% Cu anode)
Cathode: Cu²⁺ + 2e⁻ → Cu(pure) (deposition of 99.99% Cu cathode)
Cell voltage ~0.2-0.3 V (much less than Hall-Heroult because same metal dissolves and deposits)

原材料

  • Blister copper anodes (99% Cu) — Copper smelting (flash or reverberatory furnace) (Impure copper feed)
  • Sulfuric acid (H₂SO₄) — Contact process and SO₂ capture from smelting (Electrolyte acid)
  • Copper sulfate (CuSO₄) — Dissolution of copper in H₂SO₄ + air (Electrolyte copper source)

最終製品

  • Electrolytic tough pitch (ETP) copper cathode — Electrical wiring, motors, electronics, construction (99.99% Cu (4N), meets LME Grade A specification)
  • Anode slime — Precious metal recovery (Au, Ag, Se, Te, Pt) (Contains $500-2,000 worth of precious metals per ton of Cu)
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Environmental Impact

Electrorefining is relatively clean as an electrolytic process. The main environmental concerns relate to upstream copper smelting, which produces SO₂ (captured as sulfuric acid). Acid mist from electrolysis tanks requires ventilation. Spent electrolyte is recycled. Copper mining is the primary environmental concern — open-pit mines and tailings dams.

安全性の考慮事項

最新のイノベーション

Permanent stainless steel cathode technology (ISA/Kidd process) eliminates copper starter sheets.
Solvent extraction-electrowinning (SX-EW) processes leach copper from oxide ores without smelting.
Bioleaching using acidophilic bacteria extracts copper from low-grade sulfide ores.

生産規模

25000000

トン/年

$200 billion

市場価値

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Frequently Asked Questions

What industry uses 高純度金属のための銅電解精製?
高純度金属のための銅電解精製 is used in the metallurgy & metal processing sector at global industrial scale scale.
What process is involved in 高純度金属のための銅電解精製?
Blister copper anodes (99% Cu) are suspended in tanks of acidified CuSO₄ solution (180-220 g/L CuSO₄, 150-200 g/L H₂SO₄) at 60-65 degrees C. A DC current of 200-400 A/m² dissolves Cu from the anode and deposits it on thin copper starter sheets (cathodes) over 10-14 days. Impurities less noble than C
What is the economic significance of 高純度金属のための銅電解精製?
高純度金属のための銅電解精製 has a market value of $200 billion and annual production of 25,000,000 tons.
What is the environmental impact of 高純度金属のための銅電解精製?
Electrorefining is relatively clean as an electrolytic process. The main environmental concerns relate to upstream copper smelting, which produces SO₂ (captured as sulfuric acid). Acid mist from electrolysis tanks requires ventilation. Spent electrolyte is recycled. Copper mining is the primary envi
What raw materials are used in 高純度金属のための銅電解精製?
The main raw materials include: Blister copper anodes (99% Cu), Sulfuric acid (H₂SO₄), Copper sulfate (CuSO₄).