In the wet-process phosphoric acid production process, how to efficiently remove impurities, improve phosphoric acid purity, and reduce solvent loss has long been a key concern for enterprises. Facing increasingly stringent quality requirements and cost pressures, the choice of extraction equipment directly affects process stability and economic efficiency.
The CWL-M Centrifugal Extractor developed by Zhengzhou Tiei Extraction Technology Co., Ltd. is specifically designed for liquid-liquid extraction processes. It demonstrates outstanding performance in phosphoric acid purification, impurity removal, and extractant recovery, providing phosphoric acid producers with a compact, efficient, and stable process equipment solution.

Key Challenges in the Phosphoric Acid Extraction Process

Wet-process phosphoric acid contains various impurities, including iron, aluminum, magnesium, fluoride, sulfate, and others. Traditional extraction methods, such as mixer-settlers and extraction columns, often have the following problems:

Slow phase separation and severe mutual entrainment of the two phases, affecting extraction efficiency
High solvent loss and high recovery costs
Large equipment footprint and high engineering investment
Poor operational flexibility and sensitivity to fluctuations in the feed solution

These challenges directly affect the purity grade and extraction efficiency of phosphoric acid products, as well as overall operating costs.

Technical Features of the CWL-M Centrifugal Extractor

The CWL-M Series Centrifugal Extractor uses a centrifugal field to intensify the mass transfer and phase separation processes, enabling the rapid mixing and separation of the two phases within a very short period of time. Its key advantages include the following:

1.Rapid Phase Separation with Extremely Low Entrainment
The centrifugal force can reach hundreds to thousands of times the acceleration of gravity, reducing the phase separation time from tens of minutes in traditional equipment to just a few seconds. Compared with traditional extraction equipment, the CWL-M Centrifugal Extractor provides significant improvements in phase separation speed and entrainment control. Mutual entrainment between the organic and aqueous phases is greatly reduced, effectively minimizing organic-phase residues in the phosphoric acid product while reducing solvent loss in the raffinate and lowering the load on subsequent solvent recovery operations.

2.High Extraction Efficiency and Adaptability to Complex Feed Systems
The CWL-M Centrifugal Extractor provides high stage efficiency and sufficient mass transfer, making it particularly suitable for the co-extraction and selective separation of multiple metal ions in phosphoric acid systems. Its structural design enables more thorough contact between the two phases, ensuring stable extraction stage efficiency.

3.More Efficient Solvent Recovery
Due to the thorough separation of the two phases, the amounts of aqueous phase entrained in the organic phase and organic phase entrained in the aqueous phase are both significantly reduced. This not only reduces the amount of extractant that needs to be replenished, but also lowers the energy consumption and operating costs of the solvent recovery unit.

4.Continuous Operation and Stable Performance
The CWL-M Centrifugal Extractor supports fully continuous operation and can be flexibly connected in series to form multi-stage counter-current extraction, washing, and stripping processes. The equipment operates smoothly and has good adaptability to fluctuations in feed flow rate and phase ratio, ensuring long-term stable operation of the phosphoric acid extraction section.

Applications in Phosphoric Acid Purification

Phosphoric Acid Purification: With the CWL-M Centrifugal Extractor and a suitable extraction system, such as tributyl phosphate (TBP) or other specialized extractants, metal cations such as Fe³⁺, Al³⁺, and Mg²⁺, as well as anionic impurities such as SO₄²⁻ and F⁻, can be effectively removed from phosphoric acid, upgrading industrial-grade phosphoric acid to food-grade or electronic-grade quality.

Stepwise Impurity Removal: By configuring a multi-stage counter-current extraction-washing-stripping process, the CWL-M Centrifugal Extractor can achieve gradient separation of different impurities to meet the production requirements of phosphoric acid with different purity grades.

Online Extractant Recovery: The equipment's excellent low-entrainment performance enables efficient recovery of the extractant after the extraction section, reducing the energy consumption and equipment investment required for subsequent distillation or evaporation recovery processes.

Equipment Selection and Engineering Advantages

The CWL-M Centrifugal Extractor is available in a complete range of models, from laboratory-scale to industrial-scale units. Its maximum processing capacity can meet the requirements of large-scale phosphoric acid production lines. Its main engineering advantages include:

Small footprint: For the same processing capacity, the required footprint is only 1/5–1/3 that of traditional mixer-settlers
Enclosed operation: Suitable for the volatile and corrosive conditions of phosphoric acid extraction systems, improving the operating environment
Easy maintenance: Compact structure, convenient replacement of wearing parts, and short downtime for maintenance
Flexible material selection: Stainless steel, Hastelloy, titanium, and other corrosion-resistant materials can be selected according to the corrosivity of the phosphoric acid system

Zhengzhou Tiei Extraction Technology Co., Ltd. has more than ten years of engineering experience in the field of liquid-liquid extraction. The CWL-M Centrifugal Extractor has been applied in multiple countries, covering industries such as phosphoric acid purification, non-ferrous metal extraction, hydrometallurgy, fine chemicals, and wastewater treatment. For the specific requirements of phosphoric acid extraction, Tiei Extraction can provide comprehensive technical services covering laboratory-scale testing, pilot-scale validation, and industrial plant design, ensuring optimal matching between equipment selection and process conditions.

The upgrading of the phosphoric acid extraction process is not only related to product quality, but also directly affects production costs and the long-term competitiveness of enterprises. With its combined performance in efficient mass transfer, rapid phase separation, low entrainment, and stable operation, the CWL-M Centrifugal Extractor provides an engineering solution worthy of attention for phosphoric acid purification and solvent recovery.
For more information on technical details and equipment specifications, or to conduct extraction experiments and validation, please feel free to contact the Zhengzhou Tiei Extraction.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820