Preparation method of high-purity thorium nitrate

A thorium nitrate, high-purity technology, applied in the field of preparation of high-purity thorium nitrate, can solve the problems of weak complexation ability, increase the number of stripping stages, and affect the extraction capacity of the circulating organic phase, so as to promote stripping and improve stripping rate effect

Inactive Publication Date: 2017-03-08
永州市湘江稀土有限责任公司
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the step of back-extracting thorium in the process of separating U, Th, RE and Fe in the above process P350-hydrochloric acid system, water is generally used to back-extract thorium in the organic phase. Since the complexing ability of water and thorium is weak, the During the stripping process, the stripping of thorium in the organic phase is not completed, and at the same time, the number of stripping stages needs to be increased, which affects the

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Th(NO 3 ) 4 The separation and purification of the solution, in which Th(NO 3 ) 4 ThO in solution 2 93.94%, RE 2 o 3 0.34%, U 3 o 8 0.0055%, Fe 2 o 3 5.02%, TiO 2 0.68%. HNO 3 and NaNO 3 As a salting-out agent, deploy Th(NO 3 ) 4 solution, control [Th 4+ ]=60g / L, [HNO 3 ]=0.3mol / L, [NaNO 3 ]=1.3mol / L; P 350 The extractant was diluted with sulfonated kerosene to a P350 concentration of 25%, countercurrent extraction was used, the ratio was organic phase:water phase=3:1, and the number of extraction stages was 20 to obtain Th-loaded organic phase and raffinate. The raffinate is neutralized and removed with NaOH, and the pH is controlled to be greater than 7. After solid-liquid separation, the neutralized slag and NaNO are obtained 3 solution. NaNO obtained by solid-liquid separation 3 The solution is concentrated by evaporation, cooled and crystallized to obtain NaNO 3 Products, Back to Formulating Salting-Out Agents and NaNO 3 detergent.

[0024] ...

Embodiment 2

[0029] Th(NO 3 ) 4 The separation and purification of the solution, in which Th(NO 3 ) 4 ThO in solution 2 93.94%, RE 2 o 3 0.34%, U 3 o 8 0.0055%, Fe 2 o 3 5.02%, TiO 2 0.68%. HNO 3 and NaNO 3 As a salting-out agent, deploy Th(NO 3 ) 4 solution, control [Th 4+ ]=80g / L, [HNO 3 ]=0.5mol / L, [NaNO 3 ]=1.6mol / L; P 350 The extractant was diluted with sulfonated kerosene to a P350 concentration of 30%, countercurrent extraction was used, the ratio was organic phase:water phase=2:1, and the number of extraction stages was 25 to obtain Th-loaded organic phase and raffinate. The raffinate is neutralized and removed with NaOH, and the pH is controlled to be greater than 7. After solid-liquid separation, the neutralized slag and NaNO are obtained 3 solution. NaNO obtained by solid-liquid separation 3 The solution is concentrated by evaporation, cooled and crystallized to obtain NaNO 3 Products, Back to Formulating Salting-Out Agents and NaNO 3 detergent.

[0030] ...

Embodiment 3

[0032] Th(NO 3 ) 4 The separation and purification of the solution, in which Th(NO 3 ) 4 ThO in solution 2 93.94%, RE 2 o 3 0.34%, U 3 o 8 0.0055%, Fe 2 o 3 5.02%, TiO 2 0.68%. HNO 3 and NaNO 3 As a salting-out agent, deploy Th(NO 3 ) 4 solution, control [Th 4+ ]=70g / L, [HNO 3 ]=0.4mol / L, [NaNO 3 ]=1.5mol / L; P 350 The extractant was diluted with sulfonated kerosene to a P350 concentration of 20%, countercurrent extraction was used, the ratio was organic phase:water phase=3:1, and the number of extraction stages was 25 to obtain Th-loaded organic phase and raffinate. The raffinate is neutralized and removed with NaOH, and the pH is controlled to be greater than 7. After solid-liquid separation, the neutralized slag and NaNO are obtained 3 solution. NaNO obtained by solid-liquid separation 3 The solution is concentrated by evaporation, cooled and crystallized to obtain NaNO 3 Products, Back to Formulating Salting-Out Agents and NaNO 3 detergent.

[0033] ...

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 preparation method of high-purity thorium nitrate. The preparation method comprises the steps that HNO3 and NaNO3 are used as salting-out agents for allocating a Th(NO3)4 solution to form a mixed solution, and a P350-sulfonated kerosene organic phase is used for extracting the mixed solution; a NaNO3 solution is adopted for washing the obtained organic phase loaded with Th; and a fluorine-containing water solution is adopted for reversely extracting the washed organic phase loaded with Th. The process has the advantages that when high-purity water is adopted for thorium reverse extraction, F<-> in an added HF or NaF solution can be easily coordinated with Th<4+> to form [ThFx]<4>-x, so that reverse extraction of a P350 system with Th<4+> loaded is promoted, and the reverse extraction rate of thorium can be improved; and the product quality can reach the standards that ThO2/Th(NO3)4.6H2O is larger than or equal to 46%, and the ThO2 purity is larger than 99.9995%.

Description

technical field [0001] The invention relates to a preparation method of high-purity thorium nitrate, in particular to the process of purifying thorium nitrate by means of extraction and separation, and belongs to the field of material preparation. Background technique [0002] Monazite is one of the important rare earth ores. It also contains a considerable amount of uranium, which is a nuclear fuel urgently needed by the country at present, and contains a high content of thorium, which is a valuable resource for future important nuclear fuels. [0003] At present, the monazite mineral content in the industrially obtained concentrate can reach more than 95%, and the rest are associated minerals such as zircon sand, xenotime, and ilmenite. The caustic soda decomposition method is generally adopted in the industry to process monazite concentrate, ["Rare Earth", the first edition of the first volume, Metallurgical Industry Press 1978, P221-237), the preferential dissolution sla...

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
IPC IPC(8): C22B60/02C22B3/26
CPCY02P10/20
Inventor 俞正明李效平王凯严炳琛陈伯华李金叶徐学道
Owner 永州市湘江稀土有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap