LLC «LIT» developed the design of an industrial centrifugal extractor EС-1000PB made of high molecular weight polyethylene
Figure 1 - Industrial centrifugal extractor EС-1000PB; (1) - one stage of the separation cascade, (2) - cascade of centrifugal extractors of 83 stages for the separation of rare-earth metals along the Pr/Ce line
Design solutions are protected by patents:

- Utility Model Patent (RU) No. 150234 "Centrifugal Extractor", utility model priority dated September 15, 2014. Abramov A.M. et al.

- Patent for invention (RU) No. 2566137 "Centrifugal extractor", the priority of the invention from 10.22.2013. Abramov A.M. et al.

Table 1 - The main parameters and dimensions of the industrial centrifugal extractor EC-1000PB
* - on the solution system: 30% TBP in kerosene and 2M HNO3 with a ratio of organic to aqueous phase (O/A) flow rates equal to 1 and direct m/v emulsion type;

** - adjustment of the radius of the light phase is carried out using screw nozzles;

*** - connection to a single-phase alternating current electric network (~ 220V, 50Hz) and electric motor control using a controller (driver).
LLC «LIT» developed the design of a laboratory centrifugal extractor EС-10FA made of fluoroplastic
Figure 2 - Cascade of laboratory centrifugal extractors of the ETs-10FA model, number of steps-95, fluoroplastic material grade F-4
Table 2 - The main technical characteristics of the laboratory centrifugal extractor EC-10FA
* - on the system 30% TBF-2M HNO3 at O:A = 1: 1
Field of use: centrifugal extractors are designed for carrying out liquid-phase extraction processes used in the petrochemical industry, hydrometallurgical processes for the production of rare, dispersed, rare-earth and colored elements, highly pure substances, as well as in the production of medicines from plant materials, antibiotics, amino acids, vitamins, etc.

The principle of operation of the centrifugal extractor is based on two main technological operations: mixing the extractant and the working solution in the mixing chamber to ensure mass transfer and separation of the resulting emulsion in the rotor to obtain pure phases.

Figure 3 shows the design of a centrifugal extractor.
Рисунок 3 - Конструкция центробежного экстрактора
The operation of the centrifugal extractor is as follows:

A motor is connected to the mains supply, the shaft of which drives the rotor. After the rotor has set a predetermined number of revolutions, the initial processed solution through the nozzle - 20, and the extractant through the nozzle - 21 is fed into the mixing chamber - 18, where they are mixed with an agitator - 14 mounted on the rotor shaft - 12. The ribs 19 located in the chamber 18 prevent the twisting of liquids in the process of mixing. The resulting emulsion is transported by the blade conveyor 13 to the rotor 5. Under the action of centrifugal force in the rotor housing 6, the emulsion is stratified into light and heavy phases, while the ribs 9 assembled with a reflective disk prevent the emulsion from twisting inside the rotor. The light phase moves upward in the central part of the rotor while the heavy phase discarded by centrifugal force moves upward along the inner wall of the rotor. The light phase reaches the level of the nozzles 8, adjusted along the boundary of the separation of phases, and since the inlet openings of the nozzles are in the zone of movement of the light phase in the central zone of the rotor, the latter, overflowing into the nozzles, is removed from the rotor into the chamber 17, from where it is removed from the centrifugal nozzle 22 extractor. At the same time, the heavy phase, moving along the inner wall of the rotor, reaches the membrane 4 and through the holes in it enters the cavity of the hydraulic lock. The heavy phase moves to the hydraulic lock overflow and then, passing through the radial holes of the hydraulic lock, enters the chamber for the heavy phase 16 from where it is removed from the extractor through the pipe 23. Samplers 24 with shutoff valves 25, structurally combined to increase the rigidity of the assembly with nozzles 22 and 23, serve to control the quality of the extractor without stopping the separation process. The labyrinth seal formed by the water trap and the extractor cover prevents the entry of liquid, droplet-like and vapor medium into the extra-extractor space.

The length of the output tubes of the light phase 7 determines the position of the phase interface in the rotor, while the design allows you to refine the length of the tubes using screw adjusting nozzles 8 to configure the extractor for various density technological systems.

To connect the extractors as part of the cascade, LLC «LIT» control units are used, designed and manufactured in compliance with safety requirements, having built-in systems for monitoring the condition of extractors in the cascade, and protecting them from operational overloads and emergency situations.


LLC «LIT» carries out orders for the manufacture of industrial and laboratory centrifugal extractors of the EС-1000PB, EС-10FA models, both as individual products or as part of complete cascades ready for operation.

Negotiable price, depending on the scope of delivery.

The supplier can carry out commissioning and initial training for employees to work on the cascade of extractors at the customer's site.

The supplier provides warranty and post-warranty maintenance of the cascade of extractors throughout the entire period of operation (under a separate agreement).

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