Local-stage aqueous-phase inner circulation device with box-type extraction tank

Abstract

The invention discloses a local-stage aqueous-phase inner circulation device with a box-type extraction tank, belonging to the technical field of rare-earth extraction. The local-stage aqueous-phase inner circulation device is technically characterized by comprising an extraction tank body, wherein a clarifying chamber, a mixing chamber and a submerging chamber are arranged in the extraction tank body; the clarifying chamber is provided with an organic-phase cofferdam and an aqueous-phase cofferdam for an organic phase and an aqueous phase to enter the submerging chamber and the mixing chamber in a flowing manner; an aqueous-phase chamber is arranged in the aqueous-phase cofferdam; the interior of the aqueous-phase chamber is divided into an interstage aqueous-phase chamber and an inner circulation aqueous-phase chamber; the interstage aqueous-phase chamber is equipped with a liquid level adjustment tube; the inner circulation aqueous-phase chamber is equipped with an inner circulation adjustment tube; the aqueous phase in the clarifying chamber is ascended to the liquid level adjustment tube and the inner circulation adjustment tube via the aqueous-phase cofferdam, and then enters the interstage aqueous-phase chamber and the inner circulation aqueous-phase chamber respectively; the aqueous phase the interstage aqueous-phase chamber flows in the submerging chamber of the upper stage via a nick on the stage plate of the extraction tank; and the aqueous phase in the inner circulation aqueous-phase chamber enters the submerging chamber of the local stage via a communication tube paved on the bottom plate of the extraction tank. The provided local-stage aqueous-phase inner circulation device with the box-type extraction tank is simple and convenient in structure, and capable of adjusting, measuring and realizing stable and accurate control on the inner circulation amount of the aqueous phase, and can be used for rare-earth extraction separation.

Description

technical field [0001] The invention relates to a box-type extraction tank-level water-phase internal circulation device, more specifically, a box-type extraction tank-level water-phase internal circulation device for rare earth extraction and separation. Background technique [0002] In the extraction and separation process of rare earths, in the washing section and the stripping section, there is generally a large difference in the flow rate between the loaded organic phase and the acid washing and acid backwashing, resulting in a phase imbalance. The acid does not fully contact the reaction in the mixing chamber, resulting in prolonged reaction equilibrium time, poor washing and stripping effects, low stage efficiency, high balance acidity of the system and high residual acidity of the stripping solution, which reduces the utilization rate of acid washing and acid backwashing, and affects The quality of the separated product is reduced. Therefore, in production, it is ne...

AI Technical Summary

Problems solved by technology

[0002] In the extraction and separation process of rare earths, in the washing section and the stripping section, there is generally a large difference in the flow rate between the loaded organic phase and the acid washing and acid backwashing, resulting in a phase imbalance. The acid does not fully contact the reaction in the mixing chamber, resulting in prolonged reaction equilibrium time, poor washing and stripping effects, low stage efficiency, high balance acidity of the system and high residual acidity of the stripping solution, which reduces the utilization rate of acid washing and acid backwashing, and affects Decreased quality of separated product

Therefore, in production, it is necessary to use an amount of acid several times higher than the theoretical value for washing and stripping, resulting in low rare earth concentration, high acidity, and large volume in the stripping liquid, which brings a lot of troubles to the connection with subsequent processes and increases the consumption of acid , which increases the separation cost

Especially when acidic phosphorus extractant is used to separate heavy rare earth elements, this phenomenon is more prominent. The strong extraction ability of acidic phosphorus extractant for heavy rare earth elements even makes the organic reverse extraction incomplete, resulting in the extraction of organic phase during recycling. Decreased capacity and quality of the exported aqueous phase product

For this reason, people have improved the washing effect by improving the addition method of acid wash and acid back, and adding the amount of acid wash and acid back from the stripping section to improve the comparison, and diverting a part from the reverse liquid as rare earth washing liquid. We call it washing and anti-acid co-advancement technology. There are also two-stage agitation in the washing section and stripping section to increase the mixing time and effect. We call it double agitation technology. Although these two technologies have played some improvements, However, they have not been able to fundamentally solve the above-mentioned problems

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