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Method for extracting praseodymium and preparing aluminum-lithium-praseodymium alloy by continuous use of molten salt electrolysis and reduction extraction

A technology of molten salt electrolysis and lithium alloy, which is applied in the field of high-temperature extraction and reduction of rare earth and the production of aluminum-lithium-praseodymium alloy, which achieves wide application prospects, is conducive to the miniaturization of equipment, and the effect of small material volume

Inactive Publication Date: 2013-09-18
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stage configuration of the traditional extraction and separation module is relatively simple, including only the extraction section, the washing section and the stripping section

Method used

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  • Method for extracting praseodymium and preparing aluminum-lithium-praseodymium alloy by continuous use of molten salt electrolysis and reduction extraction
  • Method for extracting praseodymium and preparing aluminum-lithium-praseodymium alloy by continuous use of molten salt electrolysis and reduction extraction
  • Method for extracting praseodymium and preparing aluminum-lithium-praseodymium alloy by continuous use of molten salt electrolysis and reduction extraction

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1, a, preparation of reducing agent: the cathode adopts liquid aluminum, the anode adopts spectrally pure graphite rod, and the eutectic KCl-LiCl (mass fraction ratio is 51:43%) mixture is added to the electrolytic cell and heated and melted as electrolyte. , at 900 °C, galvanostatic electrolysis was performed, and the cathode current density was 1.3 A cm -2 , the tank voltage is 4.0-5.5V. After 240 minutes of electrolysis, the cathode was electrolyzed to obtain lithium, which was dissolved in liquid aluminum (5wt%) to obtain a liquid aluminum-lithium alloy; b. Extraction reaction: take out the anode and molybdenum wire, use the liquid aluminum-lithium alloy as the extractant, and the molten salt and The liquid metal ratio is 30:1, and 1wt% PrCl is added to the electrolytic cell (which doubles as an extraction cell). 3 , under the protection of argon atmosphere, stirring at 120 rpm for 4 hours; c, separation: after the reaction is complete, stop stirring, let s...

Embodiment 2

[0025] Example 2, a, preparation of reducing agent: the cathode adopts liquid aluminum, the anode adopts spectrally pure graphite rod, and the eutectic KCl-LiCl (mass fraction ratio is 52:44%) mixture is added to the electrolytic cell and heated and melted as electrolyte. , at 900 °C, galvanostatic electrolysis was performed, and the cathode current density was 1.3 A cm -2 , the tank voltage is 4.8-5.0V. After 240 minutes of electrolysis, the cathode was electrolyzed to obtain lithium, which was dissolved in liquid aluminum (3.2wt%) to obtain a liquid aluminum-lithium alloy; b. Extraction reaction: take out the anode and molybdenum wire, use the liquid aluminum-lithium alloy as the extractant, molten salt 35:1 to liquid metal, add 0.8wt% PrCl to the electrolytic cell (which doubles as an extraction cell) 3 , under the protection of argon atmosphere, stirring at 120 r / min for 5 hours; c, separation: after the reaction is complete, stop stirring, let stand for 1 hour, pour out ...

Embodiment 3

[0026] Example 3, a, preparation of reducing agent: the cathode adopts liquid aluminum, the anode adopts spectroscopically pure graphite rod, and the eutectic KCl-LiCl (mass fraction ratio is 51:43%) mixture is added into the electrolytic cell and heated and melted as electrolyte. , at 800 °C, galvanostatic electrolysis was performed, and the cathode current density was 1.3 A cm -2 , the tank voltage is 4.0-4.2V. After 240 minutes of electrolysis, the cathode was electrolyzed to obtain lithium, which was dissolved in liquid aluminum (4.8wt%) to obtain a liquid aluminum-lithium alloy; b. Extraction reaction: take out the anode and molybdenum wire, use the liquid aluminum-lithium alloy as the extractant, and melt the salt 30:1 to liquid metal, adding 1.2 wt% PrCl to the electrolytic cell (which doubles as an extraction cell) 3 , under the protection of argon atmosphere, stirring at 60 rpm for 7 hours; c, separation: after the reaction is complete, stop stirring, let stand for 1...

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Abstract

The invention provides a method for extracting praseodymium and preparing an aluminum-lithium-praseodymium alloy by continuous use of molten salt electrolysis and reduction extraction. The method comprises the following steps of: performing electrolysis by taking molten aluminum as a cathode, a graphite rod as an anode and a mixture of KCl and LiCl as an electrolyte; performing cathode electrolysis to obtain lithium; dissolving the lithium in the molten aluminum to obtain a molten aluminum-lithium alloy with lithium content of 3-5% by mass; adding praseodymium chloride as a molten salt phase into an electrolytic tank, mixing the molten aluminum-lithium alloy as a liquid metal phase with the molten salt, and performing an extraction reaction by taking the molten aluminum-lithium alloy as an extraction agent; and pouring out the molten salt to obtain the aluminum-lithium-praseodymium alloy. By adopting a molten salt / liquid metal system, the method provided by the invention is suitable for extreme conditions such as high temperature, intense radiation and the like; compared with wet-process extraction, the volume of the material extracted by use of high-temperature molten salt is small, and the miniaturization of equipment is facilitated; and a reducing agent is prepared by the molten salt electrolysis and can be recycled. The method provided by the invention adopts high-temperature chemical extraction and has broad application prospects in the field of nuclear waste after-treatment.

Description

technical field [0001] The invention relates to a production method for extracting and reducing rare earth at high temperature and preparing an aluminum-lithium-praseodymium alloy. Background technique [0002] my country is a country with a large amount of rare earth resources, and its reserves rank first in the world. Over the years, researchers engaged in rare earth chemistry and chemical industry in my country have done a lot of work in the rare earth hydrometallurgy industry, and established a variety of unique production processes, which greatly promoted the development of the rare earth industry. [0003] Rare earth elements are all in group IIIB, and their chemical properties are very similar, so separation is extremely difficult. Separation methods commonly used in rare earth wet production include step-by-step method (fractional crystallization method, fractional precipitation method and redox method), ion exchange method and solvent extraction method. In the mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36C22C1/00
Inventor 李梅李炜韩伟张密林王英财孙婷婷
Owner HARBIN ENG UNIV
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