From Ore To Finished Product: Process Difficulties And Breakthroughs in Titanium

Titanium ranks among the top ten metals in terms of crustal reserves and is not a scarce resource. Nevertheless, converting ilmenite and rutile ores into titanium‑based materials involves enormous metallurgical and processing challenges. Thanks to continuous research‑and‑development and industrial efforts, multiple technical breakthroughs have been achieved across the titanium industrial chain, covering ore beneficiation, titanium sponge smelting, melting‑forging and precision machining, gradually breaking down technical barriers for high‑end titanium materials.

1.Ore Beneficiation and Enrichment

Raw materials: ilmenite, rutile
Process: gravity separation, magnetic separation, flotation → high‑titanium concentrate

2.Chlorination‑Reduction for Titanium Sponge Production

Process: high‑temperature chlorination + rectification purification → titanium tetrachloride; Kroll process → vacuum distillation for impurity removal, crushing and screening → titanium sponge

3.Vacuum Melting and Casting for Titanium Ingot Production

Process: alloying elements such as aluminium, vanadium and molybdenum are added to titanium sponge, followed by vacuum melting and casting → titanium ingots

4.Pressure Processing and Precision Manufacturing of Titanium Products

Process: forging, rolling, extrusion, welding, heat treatment → finished products including titanium bars, plates, tubes and forgings

Applications: aerospace, marine engineering, medical devices, chlor‑alkali equipment and other fields

1.Challenges in Ore Enrichment and Chlorination

Natural ilmenite features low titanium dioxide content and abundant impurities. Producing high‑titanium slag / synthetic rutile requires lengthy upgrading procedures with high energy consumption. Chlorination generates highly corrosive titanium tetrachloride, causing severe equipment wear. Rectification‑purification of crude titanium tetrachloride involves complex workflows, bringing substantial material loss and heavy pressure for by‑product disposal.

2.Shortcomings in Titanium Sponge Smelting

The mainstream Kroll magnesium‑thermal reduction is a batch‑mode production technology. A single furnace cycle lasts from several days to more than ten days, discontinuous unlike steel or aluminium production, resulting in low efficiency and high energy consumption. High‑purity inert gas protection is required throughout the process, and equipment for magnesium‑magnesium chloride recycling is sophisticated. The porous structure of titanium sponge tends to trap impurities, imposing strict requirements on sealing, raw‑material quality and operational control. Minor mis‑operation may degrade the whole furnace batch, creating high barriers for aerospace‑grade titanium sponge manufacturing.

3.Difficulties in Melting, Casting and Forging

Titanium‑sponge melting must be conducted under vacuum or inert atmosphere. Large‑size titanium ingots are prone to compositional segregation and inclusion defects. Titanium alloys show high deformation resistance, narrow processing temperature windows, susceptibility to impurity pickup and oxidation at high temperatures, and poor formability at low temperatures. Titanium alloys exhibit high viscosity during cutting, leading to heavy tool wear. Material loss during machining of cast‑ingot components can exceed 70%, driving up overall costs. Welding in contact with air produces brittle oxide layers, and extremely stringent welding‑quality standards apply for aerospace and deep‑sea equipment.

4.Challenges in Performance Control of High‑end Alloys

Aerospace, deep‑sea engineering, medical and other applications impose divergent performance requirements on titanium alloys. Slight variations in alloy formulation, melting‑cooling procedures and heat‑treatment parameters can alter material properties, creating high technical barriers for high‑end titanium alloys.

1.Titanium Sponge Smelting

Domestically‑built large‑scale reduction‑distillation furnaces have achieved localization. Large‑tonnage furnaces improve titanium‑sponge output and quality while cutting energy consumption, raising the proportion of aerospace‑grade products and reducing reliance on imported high‑end supplies. Optimised magnesium‑chlorine circulation processes lower costs and pollution for the traditional Kroll route. Novel molten‑salt electrolysis technologies such as FFC and USTB can directly produce titanium and skip the chlorination step, yet they remain at laboratory stage without industrial‑scale deployment.

2.Ingot Melting

Electron‑beam cold‑hearth melting has been industrialised. It solves inclusion defects in ingots, allows recycling of titanium scrap, and manufactures large‑size high‑purity titanium ingots, breaking foreign monopolies. Multi‑stage melting mitigates compositional segregation. Domestic large‑size titanium‑alloy ingots support the manufacture of key national equipment such as large‑size aircraft and manned deep‑sea submersibles for 10 000‑metre‑depth operations.

3.Pressure Processing

Domestically‑manufactured equipment including ten‑thousand‑ton fast forging presses and titanium‑strip hot continuous rolling mills have been commissioned. They enable mass production of wide‑width, large‑dimension and thin‑walled titanium materials. Products such as 2.5 mm Gr5 hot‑rolled coils and 0.1 mm ultra‑thin titanium strips serve fuel‑cell, 3C and chemical industries. Steel‑titanium composite materials and near‑net‑shape forming cut material loss. Advanced welding technologies enable fabrication of large‑scale components such as marine pressure‑resistant cylinders and substrate materials for chlor‑alkali DSA anodes.

4.Alloy Development and Additive Manufacturing

Independently‑developed titanium alloys meet extreme operating conditions for deep‑sea equipment and aero‑engines. Mass production of titanium 3D‑printing powder has been realised for aerospace load‑bearing components. Post‑processing improves the fatigue resistance of additively‑manufactured parts, and near‑net‑shape forming reduces material consumption during production.

Ruihang is a direct manufacturer of titanium products, supplying optimal quality raw materials for your precision components. For more details, please feel free to contact us via email: Sam.Rui@bjrh-titanium.com