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

Method for separation and purification of thorium

An extraction and extraction technology, which is applied in the field of purifying thorium by solvent extraction, can solve the problems of large acid consumption and TBP consumption, and achieve the effects of improving purity, reducing consumption and reducing cost

Active Publication Date: 2013-03-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF3 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problems of large acid consumption and large consumption of TBP in the above-mentioned existing thorium separation and purification methods, the inventor designed a thorium separation and purification method, and submitted a Chinese patent application No. 201110074345.8. On this basis, Completed the present invention through further research

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 separation and purification of thorium
  • Method for separation and purification of thorium
  • Method for separation and purification of thorium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Prepare the raw material solution: take the aqueous thorium oxalate recovered from the production process of bastnaesite in Panxi, Sichuan, dry it at 150°C, and burn it at 520°C for 1 hour to obtain 80g of thorium oxide. Thorium oxide was dissolved with nitric acid until complete. Appropriately dilute and filter to obtain the raw material solution required for extraction. After analysis, the composition of the raw material liquid is: Th(NO 3 ) 4 =1.50mol / L; where HNO 3 =2.50mol / L. The weight percent of thorium is: ThO 2 95.36%, the main impurity is rare earth. The content of uranium is less than 0.002%.

[0055] Prepare the organic phase: take 800mL of industrial 2-ethylhexylphosphonic acid bis(2-ethylhexyl) ester (P503) extractant and dissolve it in 260 solvent oil, and dilute to 2000mL, at this time the volume concentration of the extractant 40%.

[0056] Fractional distillation extraction: The whole extraction process uses a mixed clarification extraction tan...

Embodiment 2

[0058] Preparation of raw material solution: Take concentrated thorium nitrate and dissolve it by heating with 2.5mol / L nitric acid. Let stand to cool completely, dilute appropriately and filter to obtain 1.0L raw material solution. After analysis, the composition of the raw material liquid is: Th(NO 3 ) 4 =1.50mol / L; where HNO 3 =2.52mol / L. The weight percent of thorium is: ThO 2 99.27%, the weight ratio of some rare earth impurities are: La 2 o 3 0.2%, CeO 2 0.45%, Pr 4 o 6 0.01%, Nd 2 o 3 0.03%, Y 2 o 3 0.008%. The content of uranium is less than 0.002%.

[0059] Preparation of organic phase: same as in Example 1.

[0060] Fractional distillation extraction: The whole extraction process uses a separating funnel to simulate fractional distillation extraction, and the number of extraction stages is adjusted to 6 stages of extraction, 6 stages of washing and 6 stages of back extraction. The washing solution is 2.5mol / L nitric acid, and the acid used for strippi...

Embodiment 3

[0062] Preparation of raw material solution: take the hydrous thorium hydroxide concentrate recovered in the production process of Baotou mixed rare earth mine, dry and burn to obtain anhydrous thorium oxide. Nitric acid dissolves. A small amount of solid hydroxylamine hydrochloride was added to reduce the iron. Dilute and filter to prepare raw material solution. After analysis, the composition of the raw material liquid is: Th(NO 3 ) 4 =1.45mol / L; where HNO 3 =2.50mol / L. The weight percent of thorium is: ThO 2 90.5%, the main impurity is rare earth. The content of uranium is less than 0.002%.

[0063] Preparation of organic phase: Take industrial P503 extractant and dissolve it in 260 solvent oil to reach a volume concentration of 38%. Pre-saturated with 2.5mol / L nitric acid once.

[0064]Fractional distillation extraction: The whole extraction process uses a mixed clarification extraction tank for fractional distillation extraction, and the extraction stages are 6-s...

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

PropertyMeasurementUnit
purityaaaaaaaaaa
rate of recoveryaaaaaaaaaa
purityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for separation and purification of thorium by a solvent extraction method, wherein the method comprises the following steps of: 1) mixing a thorium enrichment with inorganic acid, to prepare a raw material liquid; 2) mixing a neutral phosphine extracting agent with an organic solvent, to obtain an organic phase; 3) extracting the raw material liquid by the organic phase to obtain the first extracting liquid; 4) washing the first extracting liquid by a washing liquid, back-extracting the thorium element in the first extracting liquid by a back-extracting liquid to obtain the second extracting liquid; and 5) mixing oxalate with the second extracting liquid to obtain precipitate; and burning the precipitate to obtain thorium oxide. According to the method for separation and purification of the thorium, the purity of the thorium is improved to be above 99.99% from 80-99%, and the yield is greater than 98%.

Description

technical field [0001] The invention relates to a method for separating and purifying thorium, in particular to a process for purifying thorium by solvent extraction. Background technique [0002] Thorium element is one of the important elements in the research and development of nuclear energy. It is not easy to fission itself, but it can be transformed into fissionable U-233 after absorbing neutrons. Therefore, thorium element is a very promising nuclear energy source. Thorium is abundant in the earth's crust, about 6 parts per million, and its reserves are about three times that of uranium. In China, thorium is mainly associated with rare earth ores. The total proven thorium reserves are about 280,000 to 300,000 tons, ranking second in the world after India (accounting for 1 / 4 of the global amount). However, currently in China, the utilization rate of thorium is almost zero. In the rare earth (RE) production process, thorium is discharged into the rare earth tailings da...

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 Applications(China)
IPC IPC(8): C22B60/02C22B3/38
CPCC22B60/0291
Inventor 李德谦王艳良廖伍平
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