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

Method for separating cerium-fluorine and thorium

A solid-state separation and extraction technology, which is applied in the direction of improving process efficiency, can solve the problems of harming people's health and polluting the environment, radioactive thorium has not been separated and recovered, and the process is long, so as to achieve stable recycling properties and good stripping phenomenon , easy to synthesize effects

Active Publication Date: 2017-09-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technological process has the following problems: (1) after secondary precipitation and secondary alkali conversion, the flow process is long, and the rare earth yield is not high, about 65-75%; (2) radioactive thorium is not separated and recovered; (3) There are two radioactive waste residues and radioactive wastewater, which are harmful to people's health and pollute the environment, etc.
[0004] However, the above method still has the problems of complex raw material synthesis, high cost and low loading capacity

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 separating cerium-fluorine and thorium
  • Method for separating cerium-fluorine and thorium
  • Method for separating cerium-fluorine and thorium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0125] In order to further illustrate the solutions of the present invention, specific examples of the present invention are provided to help those skilled in the art understand and implement the present invention, but the present invention is not limited to these examples.

[0126] Reagents and sources

[0127] Diethylhexyl phosphite, di-n-octyl phosphite, di-n-heptyl phosphite, di-isooctyl phosphite, aviation kerosene and TBP were purchased from Shanghai Laish Chemical Co., Ltd.

[0128] Paraformaldehyde, di-n-hexylamine, diisobutylamine, n-butylamine, diisooctylamine, dodecylamine, isooctylamine, dimethylamine, toluene, xylene, p-toluenesulfonic acid, and heptane purchased from Aladdin Reagent Co., Ltd.

[0129] Cyanex 923 and 2-methylheptanol were purchased from Shanghai Cyanex Chemical Co., Ltd.

[0130] Feed liquid, washing liquid and stripping agent are self-made in the laboratory.

[0131] Other reagents (such as acids, etc.) are commercially available analytical re...

preparation example 1

[0134] Preparation Example 1: Preparation of (N,N-dihexylamino)methylphosphonic acid bis(2-ethylhexyl)ester

[0135]

[0136] In a three-necked flask equipped with a mechanical stirrer, a water separator, and a condensation reflux device, add diethylhexyl phosphite (1mol), paraformaldehyde (M=30, 1.05mol), di-n-hexylamine (1.05mol) , toluene (700ml) and p-toluenesulfonic acid (2g), heated to reflux at 130°C, and the water generated by the reaction was separated. When anhydrous is produced, react for another 2 hours. 10 g of potassium carbonate was added to the reaction mixture, and heating to reflux was continued for 15 min. The reaction mixture was filtered to remove excess potassium carbonate in the reaction, washed three times with distilled water, and the toluene was removed by rotary evaporation to obtain the target product.

[0137] 1 H NMR (400MHz, CDCl 3 ,ppm): δ1.74-0.86[m,(CH 3 ) 6 ,(CH 2 ) 16 ,(CH) 2 ],2.63[m,(CH 2 )],2.95[t,CH 2 , J=8Hz], 3.96[m, (CH ...

preparation example 2

[0138] Preparation Example 2: Preparation of Dioctyl (N,N-Diisobutylamino)methylphosphonate

[0139]

[0140] Except that di-n-octyl phosphite was used to replace diethylhexyl phosphite and diisobutylamine was used to replace di-n-hexylamine, the target product was prepared by the same process as in Preparation Example 1.

[0141] 1 H NMR (400MHz, CDCl 3 ,ppm): δ1.71-0.89[m,(CH 3 ) 6 ,(CH 2 ) 12 ],2.05[m,(CH) 2 ],2.31[m,(CH 2 ) 2 ],2.95[m,(CH 2 )],4.02[m,(CH 2 ) 2 ].

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 provides a method for extracting and separating cerium-fluoride and thorium. The method comprises the following steps: feed liquid containing tetravalent cerium, fluoride and thorium is provided; an amino-contained neutral phosphine extraction agent in the general formula I is used for performing extraction and separation on the tetravalent cerium-fluoride from the feed liquid to obtain extraction liquid containing cerium and fluoride and cerium extraction tail liquid; the amino-contained neutral phosphine extraction agent in the general formula I is used for performing extraction and separation on the thorium from the cerium extraction tail liquid to obtain an organic phase containing thorium and thorium extraction tail liquid; and the chemical formula is shown in the specification, wherein R1 and R2 are each and independently selected from a C1-C12 alkyl group, R3 and R4 are each and independently selected from a C1-16 alkyl group and hydrogen, and n is an integer of one to eight.

Description

technical field [0001] The present invention relates to a method for separating cerium-fluorine and thorium. More specifically, it relates to a method for separately extracting and separating tetravalent cerium-fluorine and thorium with an amino-containing neutral phosphine extractant. Background technique [0002] The methods for preparing cerium compounds from bastnaesite mainly include solvent extraction and double salt precipitation. The double salt precipitation method is to oxidize and roast bastnaesite, leaching with sulfuric acid, and through secondary double salt precipitation, secondary alkali conversion, excellent dissolution and impurity removal, rare earth chloride or rare earth carbonate and rare earth with a purity of 95% to 99% can be obtained. Ceria products. This technological process has the following problems: (1) after secondary precipitation and secondary alkali conversion, the flow process is long, and the rare earth yield is not high, about 65-75%; ...

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): C22B3/26C22B60/02C22B59/00
CPCY02P10/20
Inventor 廖伍平张志峰李艳玲吴国龙卢有彩
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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