Method and system for extracting rare earth elements

A rare earth element extraction technology, which is applied in the directions of liquid solution solvent extraction and process efficiency improvement, can solve the problems of difficulty in determining the correct position of stratification, manual observation of stratified liquid level, and high initial investment cost, so as to ensure no emulsification. , the effect of reducing the dosage and speeding up the mass transfer rate

Active Publication Date: 2013-01-23
CHANGZHOU YIMIN DRYING EQUIP
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Problems solved by technology

The disadvantage of this prior art is that the layered liquid level can only be observed manually through the upper mirror, and it is difficult to determine the correct position of the layered layer
The weak point of this prior art is: space occupation is bigger, initial investment cost is higher (in order to make the purity of each single rare earth product reach 99.99%, often use the mixing clarifier device of 1000 grades or more), extraction rate is lower

Method used

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  • Method and system for extracting rare earth elements

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Effect test

Embodiment 1

[0021] See figure 1 , the rare earth extraction system of this embodiment includes: an extraction tank 1, a stirring shaft 2 arranged on the central axis of the extraction tank 1 and having a paddle 4 at the bottom, inside the extraction tank 1 and on the A plurality of stirring rings 3 axially distributed on the stirring shaft 2, a plurality of static rings 5 ​​arranged on the inner wall of the extraction tank 1 and distributed with each stirring ring 3; the top of the extraction tank 1 is provided with a The heavy liquid inlet for inputting heavy liquid and the light phase outlet for outputting light phase material liquid, the bottom of extraction tank 1 is provided with the light liquid inlet for inputting light liquid and the heavy phase outlet for outputting heavy phase; A clarification tank 8 is arranged above the extraction tank 1, the light phase outlet of the extraction tank 1 is connected to the bottom of the clarification tank 8, and the top of the clarification tan...

Embodiment 2

[0027] The methods for extracting rare earth elements by the above rare earth extraction system include:

[0028] Quantitative aqueous solution or suspension of rare earth element as the heavy liquid is input in the extraction tank 1 through the heavy liquid inlet on the top of the extraction tank 1 (during specific implementation, it can be viewed through the glass at the top of the extraction tank (1) Observe the liquid level with the mirror, when the liquid level reaches the preset height, stop the feed liquid input;);

[0029] Start the stirring shaft 2; at the same time, heat the extraction tank 1 to keep the feed liquid in the extraction tank 1 at a preset temperature;

[0030] The extraction solvent as a light liquid is evenly entered into the extraction tank 1 from the liquid distributor at the bottom of the extraction tank 1. During the stirring process, the bottom-up stepwise mixing and mass transfer are realized between the light and heavy liquids. The light phase ...

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Abstract

The invention relates to a method and a system for extracting rare earth elements. The method for extracting rare earth elements comprises: filling a fixed amount of rare earth aqueous solution or suspension serving as heavy liquid into an extraction tank from a heavy liquid inlet on the top of the extraction tank; starting a stirring shaft; allowing an extracting agent serving as light liquid touniformly enter the extraction tank from a liquid distributor at the bottom of the extraction tank, stirring to allow the light liquid and heavy liquid to mix and transfer mass gradually from bottom up, and allowing the light phase liquid accomplishing mass transfer to overflow from the top of the extraction tank into a clarifying tank; clarifying the light phase liquid in the clarifying tank, and discharging the liquid component from a light liquid opening on the top of the clarifying tank; detecting the concentration of required rare earth elements in the light component solution dischargedfrom the clarifying tank and judging if the leaching or extraction is finished; after the leaching or extraction is finished, stopping inputting light liquid, opening an emptying valve below the clarifying tank to empty the clarifying tank; and discharging the heavy liquid in the extraction tank from a heavy liquid outlet at the bottom of the extraction tank.

Description

technical field [0001] The invention relates to a method for extracting rare earth elements and a rare earth extraction system. Background technique [0002] Rare earths are the lanthanide elements in the periodic table of chemical elements - lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd) ), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), and two closely related to the 15 elements of the lanthanide series Elements - scandium (Sc) and yttrium (Y) a total of 17 elements, called rare earth elements (RareEarth), referred to as rare earth (RE or R). [0003] In the smelting of rare earths and the processing of primary products of rare earths, a large number of chemical reagents are used, resulting in nearly 2 million tons of rare earth wastewater produced in my country every year. How to recover these rare earth elements through extraction is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
CPCY02P10/20
Inventor 陆文光
Owner CHANGZHOU YIMIN DRYING EQUIP
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