In high-end industries such as aerospace, defense, and medical manufacturing, titanium alloys are often regarded as the "backbone of modern metals." From aircraft engine blades and landing gear to airframe structures and fasteners, titanium alloys have become indispensable materials due to their unique advantages, including high strength, low density, and excellent corrosion resistance.

However, during the pickling process of titanium alloy components, a large volume of titanium-containing waste liquid is generated. These waste liquid contain considerable amounts of valuable titanium. Direct disposal not only wastes precious resources but also creates significant environmental challenges. How can titanium be efficiently recovered from pickling waste liquid? Zhengzhou Tiei Extraction's CWL-M Centrifugal Extractor provides a green solution featuring outstanding acid resistance and high recovery efficiency.

Titanium Pickling Waste Liquid: A Hidden Resource

In titanium alloy pickling operations, strong acids such as hydrofluoric acid (HF) and nitric acid (HNO₃) are commonly used to remove oxide layers and surface contaminants. As the pickling process is repeated, titanium ion concentrations gradually accumulate in the solution, eventually forming highly acidic waste liquid with titanium concentrations ranging from 5 to 30 g/L.

Traditional neutralization and precipitation treatment methods require large amounts of alkali, generate hazardous solid waste, and result in the permanent loss of recoverable titanium. For every ton of titanium alloy produced, approximately 2–5 tons of pickling waste liquid are generated. This means that tens of thousands of tons of valuable titanium are wasted annually worldwide.

Solvent Extraction: A Precise Method for Titanium Separation

Among the various titanium recovery technologies, solvent extraction stands out due to its excellent selectivity, high separation efficiency, and capability for continuous operation.Its core principle is to utilize the difference in the solubility of titanium ions between a specific extractant and the aqueous phase. Titanium is "captured" from the waste liquid into the extractant and then recovered through a stripping process to obtain a purified titanium solution, which can be reused in titanium alloy production.

The success of this process depends largely on the performance of the key equipment—the centrifugal extractor.

CWL-M Centrifugal Extractor: Powerful Performance with Strong Acid Resistance and High Recovery Efficiency

The CWL-M Series Centrifugal Extractor, independently developed by Zhengzhou Tiei Extraction, is specially designed for highly corrosive systems and has demonstrated excellent performance in multiple titanium waste liquid recovery projects.

Process Flow of Titanium Waste Liquid Recovery

1.Pickling Waste Liquid Pretreatment: After suspended solids are removed, the acidity of the waste liquid is adjusted to an appropriate level.

2.Extraction Stage: The titanium-containing waste liquid and the organic phase containing the extractant simultaneously enter the CWL-M Centrifugal Extractor. High-speed centrifugal force intensively mixes the two phases, allowing titanium ions to be rapidly extracted into the organic phase. The raffinate aqueous phase (with low titanium content) is discharged or sent for further treatment.

3.Scrubbing Stage: The loaded organic phase is scrubbed with dilute acid to remove impurity ions.

4.Stripping Stage: The scrubbed organic phase is mixed with a stripping agent. Titanium is stripped into the aqueous phase, producing a purified titanium solution, while the organic phase is recycled for reuse.

5.Post-Treatment: The titanium solution undergoes concentration, precipitation, calcination, and other processes to produce titanium dioxide or titanium pigment, which is then returned to the industrial value chain.

Key Advantages of CWL-M Centrifugal Extractor

1.Excellent Resistance to Strong Acid Corrosion, Stable and Reliable Operation
The wetted parts of the CWL-M Centrifugal Extractor are made of fluoroplastics (F46/PTFE) or special alloy materials, enabling long-term resistance to highly corrosive acids such as hydrofluoric acid, nitric acid, and sulfuric acid. The equipment can operate continuously for several months without replacing wear parts, significantly reducing maintenance costs.

2.High Extraction Efficiency, Recovery Rate Exceeding 95%
Under the action of high-speed centrifugal force, the two phases achieve more intensive contact and faster separation. Field data show that the single-stage titanium extraction efficiency can reach more than 95%. With multistage counter-current operation, the overall recovery rate can exceed 98%, ensuring maximum recovery of valuable titanium resources.

3.Large Processing Capacity with Only One-Fifth of the Footprint of Traditional Equipment
Compared with mixer-settlers and extraction columns, the CWL-M Centrifugal Extractor offers a processing capacity per unit volume that is 3–5 times higher. A single unit can handle 0.5–50 m³/h of waste liquid. Its modular design also allows for flexible installation and easy capacity expansion.

4.Fully Enclosed Operation, Safe and Environmentally Friendly
The fully enclosed structure effectively prevents acid mist emissions and creates a safer, cleaner working environment. The equipment operates automatically and continuously without constant manual supervision, reducing operational risks and labor requirements.

The CWL-M Centrifugal Extractor from Zhengzhou Tiei Extraction combines outstanding resistance to strong acids with highly efficient resource recovery capabilities, helping enterprises extract value from waste liquid and promote the sustainable utilization of titanium resources.
If you have titanium pickling waste liquid or other metal-containing pickling waste solutions (such as nickel, cobalt, copper, and others) that require recovery and treatment, please contact Zhengzhou Tiei Extraction. Our team can provide customized process solutions and professional equipment selection recommendations tailored to your specific requirements.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820