PTFE Extraction Tank(Extraction box, extractor, and mixed clarification unit) is a step-wise contact extraction equipment consisting of a stirring system, mixing zone, clarification zone, and phase separation zone. In each stage, the two immiscible liquid phases undergo stirring, mixing, clarification, and phase separation processes, thereby achieving mass transfer and separation of the target solute between different liquid phases.
Work Process
The specific operating process of the extraction tank (mixed clarification tank) involves the feed liquid and extractant being pumped into the mixing chamber through their respective feed ports by a feed pump. A high-speed stirrer then facilitates mixing and mass transfer between the feed liquid and extractant. Subsequently, the mixture flows through overflow baffles into the clarification chamber, where the two phases, light and heavy, are separated under the action of gravity. The separated light and heavy phases then enter different outlets, completing one extraction cycle. In actual production, the extraction tank is typically a multi-stage series arrangement, including extraction, reverse extraction, washing, and regeneration sections, among others, and the configuration should be tailored to the specific production process.
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Mixed Mass Transfer Process
Raw Material IntroductionThe raw liquid to be extracted and the extracting agent are separately introduced into the mixing chamber of the extraction tank through their respective feed ports. For example, inHydrometallurgyIn the process, a water solution containing metal ions serves as the raw liquid, while an organic extractant is introduced as another liquid phase into the mixing chamber.
Agitate and blendThe mixing chamber is equipped with a stirrer, which rotates at high speed, allowing the raw material liquid and the extracting agent to fully contact and mix. Under the action of stirring, the solute is transferred from the raw material liquid to the extracting agent, forming a two-phase solution. The intensity and duration of stirring have a significant impact on the mass transfer efficiency; insufficient stirring may result in inadequate contact between the two phases, reducing the mass transfer efficiency; excessive stirring, however, could lead to emulsification, increasing the difficulty of subsequent separation.
Separation process
Overflow enters clarification chamberThe mixed liquid enters the clarification chamber through overflow baffles. The clarification chamber is a spacious room with a large cavity volume, providing ample space for the liquid to settle and separate.
Gravity Natural SeparationIn the clarification chamber, due to the different densities of the raw liquid and the extracting agent, under the action of gravity, the two phases gradually separate. The denser phase (usually the heavy phase) sinks to the bottom, while the less dense phase (usually the light phase) floats on top, forming a clear phase interface.
Partial contact reduces mass transfer efficiency; excessive stirring can lead to emulsification, increasing the difficulty of subsequent separation.
Key Features
● High efficiency level
●Simple Structure: The extraction tank typically consists of a tank body, interface regulating tube, motor reducer, stirrer shaft, impeller, speed controller, and a movable platform, making the structure relatively simple.
●Stable Operation, High Adaptability: Due to the larger volume of the extraction tank and the higher liquid storage capacity, it can accommodate a certain range of fluctuations in the feedstock liquid. After adjustment and balance, the operation is relatively stable and highly adaptable.
● Scalable Reliability: Single-stage extraction rates and other design parameters remain relatively reliable after scaling up.
Application Fields
Copper Extraction
Rare Earth Extraction and Separation
Nickel Cobalt Extraction
Rare Metal Extraction
Nuclear industry
