In the fields of chemicals, agriculture, food, pharmaceuticals, and even new energy, the purity of phosphoric acid—as a fundamental raw material—directly determines the added value and scope of its applications. Owing to its advantages of low energy consumption and low cost, the wet-process phosphoric acid method has gradually replaced the highly polluting and energy-intensive thermal process, becoming the mainstream route for phosphoric acid production. However, wet-process phosphoric acid contains significant amounts of impurities such as magnesium, aluminum, iron, and sulfate, which must be deeply removed to meet food-grade, pharmaceutical-grade, or even electronic-grade standards. Among the various purification methods, solvent extraction stands out as one of the most widely applied technologies due to its high efficiency, continuous operation, and industrial maturity. At the core of this field lies the CWL-M centrifugal extractor, a representative of technological innovation and advancement.
Challenges and Demands in Wet-Process Phosphoric Acid Purification
The purification of wet-process phosphoric acid is generally divided into two stages: pretreatment and deep purification. Pretreatment involves steps such as desulfurization, decolorization, defluorination, and dearsenication to initially remove impurities; deep purification requires advanced methods such as ion exchange, chemical precipitation, membrane separation, crystallization, and solvent extraction to further enhance purity. Among these, solvent extraction, through the distribution and transfer of substances between two phases, enables efficient purification of phosphoric acid and is particularly suitable for large-scale industrial production.
However, traditional extraction processes still face numerous challenges: limited choice of extractants, low equipment efficiency, lengthy processes, high energy consumption, and difficulties in handling waste acid.
Technical Advantages of the CWL-M Centrifugal Extractor
The CWL-M centrifugal extractor is a high-efficiency separation equipment developed specifically for wet-process phosphoric acid purification. Its core advantages are reflected in the following aspects:
- Efficient Mass Transfer and Rapid Phase Separation
By applying a high-speed centrifugal force field, the equipment greatly increases the interfacial contact area between phases, significantly enhancing mass transfer efficiency and shortening phase separation time. This design avoids common issues in traditional extraction column such as emulsification and clogging. - Wide Feedstock Adaptability
Wet-process phosphoric acid derived from phosphate ores of varying grades often differs in concentration and impurity composition. The CWL-M centrifugal extractor allows flexible adjustment of operating parameters such as rotational speed and phase flow ratio, ensuring adaptability to different feed concentrations while maintaining high extraction efficiency and product stability. - Energy Saving and Environmentally Friendly
With its compact structure and small footprint, the equipment consumes significantly less energy than traditional extraction column. Its closed-loop operation mode effectively reduces solvent evaporation, minimizing environmental pollution and material loss—fully in line with the principles of green chemistry. - High Degree of Automation and Stable Operation
Integrated with an intelligent control system, the CWL-M centrifugal extractor enables continuous and automated production, reducing manual intervention, improving process controllability, and ensuring consistent product quality. This makes it particularly well-suited for long-cycle, large-scale industrial applications.
Practical Applications in Wet-Process Phosphoric Acid Purification
The CWL-M centrifugal extraction technology has already been successfully applied in multiple phosphate chemical enterprises. For example, in a large-scale phosphoric acid purification project, replacing traditional extraction column with CWL-M centrifugal extractors increased the extraction rate to over 95%, significantly improved the purity of the stripped phosphoric acid, and effectively controlled the phosphorus content in the raffinate acid—laying a solid foundation for subsequent comprehensive utilization.
The CWL-M centrifugal extractor demonstrates excellent performance in the extraction, washing, and stripping stages of pretreated phosphoric acid. In particular, when combined with high-efficiency extractants such as TBP (tributyl phosphate), it shows outstanding compatibility and stability. Furthermore, its modular design facilitates process expansion and retrofitting, making it an ideal choice for upgrading existing production lines.
As the phosphate chemical industry moves toward greater refinement and high-end applications, wet-process phosphoric acid purification technology still requires continuous breakthroughs in areas such as extractant development, equipment integration, and waste acid resource utilization. The CWL-M centrifugal extractor, as a high-efficiency separation equipment, is poised for upgrades in process integration and intelligent operation. By combining with technologies such as membrane separation and ion exchange, it enables the creation of multi-technology integrated processes that further enhance product purity and production efficiency.
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