크롤 공정에 의한 타이타늄 생산
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매우 안정적인 산화물에서 항공 우주 금속 추출하기
개요
Titanium metal is produced by the Kroll process — reduction of titanium tetrachloride (TiCl₄) with magnesium in an inert atmosphere. Developed by William Kroll in 1940, this batch process remains the primary production method despite 80+ years of efforts to develop a continuous alternative. Titanium's exceptional strength-to-weight ratio, corrosion resistance, and biocompatibility make it essential for aerospace (jet engines, airframes), medical implants, chemical processing equipment, and marine applications. The process is inherently expensive because titanium's extreme reactivity with oxygen requires strict inert atmosphere handling throughout.
화학 공정
TiCl₄ (from chlorination of rutile ore TiO₂ + C + Cl₂) is slowly fed into a sealed stainless steel retort containing molten magnesium at 800-850 degrees C under argon atmosphere. Magnesium reduces TiCl₄ to titanium metal and MgCl₂. The resulting sponge-like mass is cooled, extracted from the retort, crushed, and the entrapped MgCl₂ is removed by vacuum distillation at 1,000 degrees C. The titanium sponge is compacted and melted in a vacuum arc furnace to produce ingots.
TiCl₄ + 2Mg →[800-850 degrees C, Ar] Ti(sponge) + 2MgCl₂ (Kroll reduction)
MgCl₂ →[electrolysis] Mg + Cl₂ (magnesium and chlorine recycling)
원자재
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Titanium tetrachloride (TiCl₄) — Chlorination of rutile (TiO₂) at 900 degrees C (Titanium source (purified by distillation to >99.9%))
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Magnesium metal (Mg) — Electrolysis of MgCl₂ (Pidgeon or Dow process) (Reducing agent)
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Argon gas (Ar) — Air separation (Inert atmosphere (Ti reacts with N₂ and O₂))
최종 제품
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Titanium sponge — Melted into ingots for aerospace, medical, chemical applications (>99.5% Ti, grades 1-4 (CP) and grade 5 (Ti-6Al-4V alloy))
Environmental Impact
The Kroll process is energy-intensive (20-50 kWh/kg Ti) and produces chlorinated waste. Chlorine gas from TiCl₄ production is recycled. MgCl₂ byproduct is electrolyzed to recover Mg and Cl₂, creating a closed loop. The batch nature of the process limits throughput and increases cost. Titanium scrap recycling is well-established but limited by alloy mixing.
안전 고려사항
- ⚠ TiCl₄ is corrosive and produces HCl fumes on contact with moisture
- ⚠ Molten magnesium is pyrophoric and reacts violently with water
- ⚠ Titanium sponge fines are flammable
- ⚠ Chlorine gas is extremely toxic — leak detection essential
최근 혁신
The FFC Cambridge process (electrolytic reduction of TiO₂ directly) could reduce cost by 50-75%.
Armstrong/CSIRO continuous processes produce titanium powder directly from TiCl₄.
Additive manufacturing (3D printing) of titanium enables near-net-shape parts, reducing the buy-to-fly ratio from 10-20:1 to near 1:1 for aerospace components.
생산 규모
250000
톤/년
$6 billion
시장 가치
더 보기: Metallurgy & Metal Processing
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