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

Method for recovering thorium, uranium and rare earth from monazite smelting acid-insoluble slag

A monazite and acid-insoluble technology is applied in the field of recovering thorium, uranium and rare earth from the acid-insoluble slag of monazite smelting, which can solve the problems of large investment in equipment, low recovery rate, difficulty in reflecting social and economic benefits, and achieve Low consumption, environmental friendliness, obvious social and economic benefits

Inactive Publication Date: 2015-01-14
HUNAN RARE EARTH METAL MATERIAL RES INST
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main methods for treating acid-insoluble slag in industry include alkali melting method, alkali pressurization method, acid low-temperature roasting method, acid pressure leaching method, etc., but all of them have the disadvantages of low recovery rate or excessive investment in equipment, and it is difficult to Reflect its social and economic benefits

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 recovering thorium, uranium and rare earth from monazite smelting acid-insoluble slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix 1000g of monazite smelting acid insoluble slag (including rare earth (REO): 12%, thorium: 2.5%, uranium: 0.3%) with 1200g (98% by volume) concentrated sulfuric acid and place in an air atmosphere at 250°C Roast at constant temperature for 3 hours to form soluble salts of rare earth, thorium, uranium and other valuable elements, that is, to form roasted slag; (2), after leaching the roasted slag with water at room temperature, control the acidity of the solution to 1mol / L, filter, and filter the filtrate with N,N- Dipropyl-1-propanamine extraction agent extracts uranium, and the weight percentage of N,N-dipropyl-1-propanamine and filtrate used is 18%; Then use ammonium bicarbonate back extraction to obtain ammonium diuranate product, used bicarbonate The weight ratio of ammonium to filtrate is 50%. The analysis shows that the thorium and rare earth in the ammonium diuranate product are less than 0.01%, and the thorium and rare earth are hardly extracted and remain...

Embodiment 2

[0028] (1) Mix 1200g of monazite smelting acid-insoluble slag (of which rare earth (REO): 13%, thorium: 2.8%, uranium: 0.4%) and 1600g (98% by volume) concentrated sulfuric acid and put them in an air atmosphere at 300°C Roast at constant temperature for 4 hours to form soluble salts of rare earth, thorium, uranium and other valuable elements, that is, to form roasted slag; (2), after leaching the roasted slag with water at room temperature, control the acidity of the solution to 1.5mol / L, filter, and use trioctane as the filtrate Ammonium diuranate product is obtained by back extraction with ammonium bicarbonate, and the weight ratio of ammonium bicarbonate and filtrate used is 52% , the analysis found that thorium and rare earths in the ammonium diuranate product were less than 0.01%, thorium and rare earths were hardly extracted, and remained in the solution; (3), the solution after extracting uranium was extracted with diethylamine extractant, and the diethylamine used was ...

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 separation method for recovering thorium, uranium and rare earth from monazite smelting acid-insoluble slag. The method comprises the following steps of mixing acid-insoluble slag and concentrated sulfuric acid to obtain a uniform mixture, carrying out constant-temperature roasting, adding water into the roasted slag, carrying out leaching at a room temperature, extracting uranium by a tertiary amine extraction agent, extracting thorium from the solution without uranium by a primary amine extraction agent, and carrying out alkali deposition on the solution without uranium and thorium to obtain a rare earth mixture product. The method has simple processes and large scale production feasibility, utilizes common chemical materials having low consumption, can effectively extract rare earth from residual acid-insoluble slag in a monazite smelting process, can acquire single thorium and uranium products, has a total yield more than 90% and slag consumption amount more than 50%, is environmentally friendly and has obvious social and economic benefits.

Description

technical field [0001] The invention relates to a separation process for recovering thorium, uranium and rare earth from monazite smelting acid infusible slag. Specifically, the acid-insoluble slag after drying is mixed with concentrated sulfuric acid and roasted evenly at a constant temperature. After the roasted slag is leached with water at room temperature, the uranium is extracted with a tertiary amine extractant, and the ammonium diuranate product is obtained by back-extracting with ammonium bicarbonate. After extracting the uranium The solution is continued to extract thorium with primary amine extractant, and the solution after extraction of uranium and thorium is precipitated with alkali to obtain a rare earth mixture product. Background technique [0002] In the smelting process of monazite and ionic rare earth ores, a large amount of acid-insoluble slag is piled up or discarded. Because it contains radioactive elements such as thorium and uranium, it causes great...

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): C22B60/02C22B59/00C22B1/06C22B3/08C22B3/28
Inventor 罗宏王志坚翁国庆兰石琨
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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