Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for extracting and recovering rare earth with low-concentration rare earth solution

A rare earth solution, low concentration technology, applied in the direction of improving process efficiency, etc., can solve the problems of low rare earth recovery rate, high cost, easy to pollute the environment, etc., to achieve the effect of improving rare earth recovery rate, protecting the environment and shortening the process flow

Active Publication Date: 2017-10-13
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for extracting and recovering rare earths with a low-concentration rare-earth solution, so as to solve the problems of low rare-earth recovery rate, high cost, and easy pollution of the environment in the existing low-concentration rare-earth solution recovery process.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting and recovering rare earth with low-concentration rare earth solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Magnesium sulfate is used as the leaching agent to leach ion-adsorbed rare earth ores to obtain a rare earth sulfate solution containing rare earth REO 0.12g / L as a raw material solution (wherein REO / TREO is 50% for medium and heavy rare earths, and REO / TREO for light rare earths is 50%) %).

[0044] Use 0.5mol / L P507-containing first organic phase (the diluent is kerosene) to extract the medium-heavy rare earths in the raw material liquid, using two-stage cross-flow extraction, the volume ratio of the first organic phase to the aqueous phase (O / A) is 1:25, the extraction rate of medium and heavy rare earths in the raw material solution was 80.3%, and the primary loaded organic phase and primary raffinate containing rare earth REO3.9g / L were obtained.

[0045] The primary raffinate was then extracted with 0.5 mol / L of P204-containing second organic phase (the diluent is kerosene) to extract the remaining rare earths, using 4-stage cross-flow extraction, the volume ratio...

Embodiment 2

[0050] The mixed solution of magnesium sulfate and magnesium chloride is used as the leaching agent to leach ion-adsorbed rare earth ores, and a rare earth solution containing 0.5g / L of rare earth REO is obtained as a raw material solution (the medium and heavy rare earth REO / TREO is 30%, and the light rare earth REO / TREO is 70%).

[0051] Use 0.70 mol / L of the first organic phase containing P507 (the diluent is sulfonated kerosene) to extract the medium and heavy rare earths in the raw material liquid, and use 3-stage semi-countercurrent extraction, the volume ratio of the organic phase to the aqueous phase (O / A) is 1:20, the extraction rate of medium and heavy rare earths in the raw material liquid is 90.5%, and the primary loaded organic phase and primary raffinate containing rare earth REO4.0g / L are obtained.

[0052] The primary raffinate is then extracted with 0.8 mol / L of P204-containing second organic phase (the diluent is n-hexane) to extract the remaining rare earth...

Embodiment 3

[0057] Magnesium sulfate solution is used as the leaching agent to leach ion-adsorbed rare earth ores to obtain a rare earth sulfate solution containing rare earth REO1. 80%).

[0058] Use 1.2mol / L P229-containing first organic phase (the diluent is kerosene) to extract the medium-heavy rare earths in the raw material liquid, adopt 4-stage countercurrent extraction, and the volume ratio of organic phase to aqueous phase (O / A) is 1:10 , the extraction rate of medium and heavy rare earths in the raw material solution was 82%, and a primary loaded organic phase and primary raffinate containing rare earth REO3.0g / L were obtained.

[0059] The primary raffinate is then extracted with 1.0 mol / L of the second organic phase containing P204 (the diluent is kerosene) to extract the remaining rare earths, using 3-stage countercurrent extraction, and the volume ratio (O / A) of the organic phase to the aqueous phase is 1: 10. Obtain a secondary loaded organic phase containing rare earth RE...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recovery of rare earth by low concentration rare earth solution extraction. The method uses a rare earth solution containing heavy and middle rare earth as raw material liquid, and comprises the following steps: subjecting the raw material liquid to a first extraction by using a first organic phase of an acidic phosphorous extractant with PKa value higher than 4, so as to obtain a first loading organic phase and a first raffinate; subjecting the first raffinate to a second extraction by using a second organic phase of an acidic phosphorous extractant with PKa value less than 3.5, o as to obtain a second loading organic phase and a second raffinate; and conducting reverse extraction to recover the rare earth in the first loading organic phase and the second loading organic phase, so as to obtain high concentration chlorination rare earth solution. The method for recovery of rare earth by low concentration rare earth solution extraction has the advantages of shortened process flow, improved rare earth recovery, reduced production cost and no emission of ammonia nitrogen wastewater, realizes clean and efficient extraction of low concentration rare earth solution, improves the utilization of rare earth resources, reduces pollutant emission and chemical raw material consumption, and effectively protect the environment.

Description

technical field [0001] The invention relates to the technical field of rare earth hydrometallurgy, in particular to a method for extracting and recovering rare earth from a low-concentration rare earth solution. Background technique [0002] Ion-adsorbed rare earth ores are precious resources rich in medium and heavy rare earths that are rare in the world, in which rare earths are adsorbed on aluminosilicate minerals such as kaolin and mica in an ion state. The content of rare earth in this kind of ion adsorption type rare earth ore is very low, generally less than one thousandth, containing lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, More than ten rare earth elements of yttrium, (lanthanum, cerium, praseodymium, neodymium are called "light rare earths", samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium are called "m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 黄小卫王良士冯宗玉黄莉王猛肖燕飞崔大立
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com