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An extraction method for high-efficiency enrichment and recovery of low-concentration rare earth ions

A technology of rare earth ions and rare earth ion solutions, which is applied in the direction of improving process efficiency, etc., to achieve the effects of fast mass transfer rate, large specific surface area, and short mass transfer distance

Active Publication Date: 2018-07-06
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • An extraction method for high-efficiency enrichment and recovery of low-concentration rare earth ions

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Embodiment 1

[0025] see figure 1 , Dissolve the chloride of neodymium with hydrochloric acid aqueous solution of pH=4, and make rare earth ion solution (initial concentration is 90mg / L). Take 34mL of monoisooctyl phosphate (P507) and 66mL of sulfonated kerosene and stir to obtain a homogeneous solution, wherein the concentration of the extractant is 1mol / L. Open the gas valve, the gas mass flow meter, and the switches of the two advection pumps, and adjust the direction of the five-way ball valve so that the length of the outlet pipe stays at 2m. In the first-stage membrane dispersion micro-extractor, the gas is the dispersed phase, and the organic phase is the continuous phase; in the second-stage membrane dispersion micro-extractor, the gas-in-oil structure is the dispersed phase, and the continuous phase is the rare earth ion solution. The flow rate of the water phase is adjusted to 40mL / min, the flow rate of the oil phase is 0.2mL / min, and the flow rate of the gas phase is 90mL / min. ...

Embodiment 2

[0027] The chloride of europium was dissolved in aqueous hydrochloric acid solution with pH=4 to prepare a rare earth ion solution (initial concentration: 50mg / L). Take 34mL of monoisooctyl phosphate (P507) and 66mL of sulfonated kerosene and stir to obtain a homogeneous solution, wherein the concentration of the extractant is 1mol / L. Open the gas valve, the gas mass flow meter, and the switches of the two advection pumps, and adjust the direction of the five-way ball valve so that the length of the outlet pipe stays at 2m. In the first-stage membrane dispersion micro-extractor, the gas is the dispersed phase, and the organic phase is the continuous phase; in the second-stage membrane dispersion micro-extractor, the gas-in-oil structure is the dispersed phase, and the continuous phase is the rare earth ion solution. The flow rate of the water phase is adjusted to 40mL / min, the flow rate of the oil phase is 0.2mL / min, and the flow rate of the gas phase is 90mL / min. After the f...

Embodiment 3

[0029] Dissolve erbium chloride with aqueous hydrochloric acid solution at pH=4 to form a rare earth ion solution (initial concentration: 10 mg / L). Take 34mL of monoisooctyl phosphate (P507) and 66mL of sulfonated kerosene and stir to obtain a homogeneous solution, wherein the concentration of the extractant is 1mol / L. Open the gas valve, the gas mass flow meter, and the switches of the two advection pumps, and adjust the direction of the five-way ball valve so that the length of the outlet pipe stays at 2m. In the first-stage membrane dispersion micro-extractor, the gas is the dispersed phase, and the organic phase is the continuous phase; in the second-stage membrane dispersion micro-extractor, the gas-in-oil structure is the dispersed phase, and the continuous phase is the rare earth ion solution. The flow rate of the water phase is adjusted to 40mL / min, the flow rate of the oil phase is 0.2mL / min, and the flow rate of the gas phase is 90mL / min. After the fluid flowed for 5 ...

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Abstract

The invention discloses an extraction method for high-efficiency enrichment and recovery of low-concentration rare-earth ions, which is to complete the extraction of low-concentration rare-earth ions in a gas-liquid-liquid three-phase system in an extreme phase ratio greater than 50 in a membrane dispersion micro-extractor enrichment, and then use the membrane dispersion micro-extractor to complete the stripping process again. The present invention is based on the advantages of fast mass transfer rate, short mass transfer distance and large specific surface area under the extreme comparison of water phase flow rate: oil phase flow rate>50:1 in the gas-liquid-liquid three-phase system, and adopts a membrane dispersion micro-extractor Rapidly realize the extraction process of rare earth ions under extreme contrast. After the extraction is completed, the concentration of rare earth ions in the water phase can reach the national emission standard. At the same time, liquid-liquid extraction is used in this equipment to complete the stripping of rare earth ions from the organic phase to the water phase. After stripping, the concentration of enriched rare earth ions can be greater than 20g / L, and the organic phase can be recycled repeatedly, which truly realizes The target of enrichment and recovery of rare earth ions.

Description

technical field [0001] The invention relates to the technical field of solvent extraction and separation of rare earth ions, in particular to an extraction method for efficiently enriching and recovering low-concentration rare earth ions. Background technique [0002] Rare earths are known as "industrial vitamins" and are important strategic resources. At present, it has been widely used in various fields of the national economy, and its application has covered dozens of industries such as metallurgical industry, traditional agriculture, medical and health care, and high-tech industries. However, a large amount of low-concentration (<100mg / L) rare earth ion raffinate or low-concentration rare earth leaching solution is produced during the mining, smelting and separation process of rare earths. If they are discharged directly, one will cause environmental pollution, and the other will cause A great waste of rare earth resources. The rare earth industry is a rare advantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/38C22B3/02
CPCC22B3/02C22B59/00C22B3/3844Y02P10/20
Inventor 王运东徐建鸿陈卓骆广生桑富宁
Owner TSINGHUA UNIV
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