PTFE Extracting Tank(Extraction boxes, extractors, and mixing clarification units) are a series of contact extraction devices, consisting of a stirring system, mixing zone, clarification zone, and phase separation area. In each stage, the two immiscible liquid phases undergo mixing, clarification, and phase separation, thereby achieving mass transfer and separation of the target solute between different liquid phases.
Process of work
The specific working 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 mixes the feed liquid and extractant for mass transfer. Subsequently, they flow through overflow baffles into the clarification chamber, where separation of the light and heavy phases occurs under 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 configuration, including extraction, back-extraction, washing, and regeneration sections, among others, which should be configured according to the specific production process.
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Mixed Mass Transfer Process
Raw Material IntroductionThe raw material liquid and the extracting agent are separately fed into the mixing chamber of the extraction tank through their respective feed ports. For instance, inHydrometallurgyIn this process, a water solution containing metal ions serves as the feedstock in the mixing chamber, while an organic solvent acts as the second liquid phase.
Blended搅拌混合The mixing chamber is equipped with a stirrer that rotates at high speed, allowing the raw material liquid and solvent to come into full contact and mix. Under the action of stirring, the solute is transferred from the raw material liquid to the solvent, forming a two-phase solution. The intensity and duration of stirring have a significant impact on the mass transfer efficiency. Insufficient stirring can lead to inadequate contact between the two phases, reducing the mass transfer efficiency; whereas, excessive stirring may cause emulsification, increasing the difficulty of subsequent separation.
Separation process
Overflow enters the 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 differing densities of the raw liquid and the extracting agent, under the influence 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 to the top, forming a clear phase interface.
Partial contact reduces mass transfer efficiency; excessive stirring may lead to emulsification, increasing the difficulty of subsequent separation.
Key Features
● High-grade efficiency
●Simple Structure: The extraction tank typically consists of a tank body, interface adjustment pipe, motor reducer, stirrer shaft, impeller, speed controller, and a movable platform, etc., with a relatively simple structure.
●Stable Operation and Strong 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 balancing, 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
