Method for selectively extracting non-cerium rare earth in mixed rare earth concentrate

A mixed rare earth, selective technology, applied in the field of hydrometallurgy, can solve the problems of non-reuse, difficult to recycle, etc.

Active Publication Date: 2020-10-23
BAOTOU RES INST OF RARE EARTHS +1
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the high-temperature roasting process of concentrated sulfuric acid, phosphorus and the added iron powder form compounds and enter the radioactive waste residue, which cannot be reused; in the alkali decomposition process, phosphorus resources are combined with sodium hydroxide, sodium fluoride, sodium carbonate, and even sodium sulfate in the form of sodium phosphate etc. to form mixed alkaline wastewater, which is difficult to recycle

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 selectively extracting non-cerium rare earth in mixed rare earth concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 100g bastnaesite and monazite mixed rare earth concentrate (REO: 64.0%, P 2 o 5 : 6.8%) was oxidized and roasted in air at 550° C. for 1 hour to form 85 g of oxidized roasted ore. The roasted ore was uniformly mixed with 68 g of concentrated sulfuric acid with a mass percentage of 98%, and then roasted at 150°C for 2 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:5, and the sulfuric acid roasted ore is soaked in water to adjust slurry and separate from solid and liquid to obtain 590ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.2g / L, CeO 2 The dissolution rate was 48.0%, P 2 o 5 The dissolution rate was 9.4%.

Embodiment 2

[0029] 100g bastnaesite and monazite mixed rare earth concentrate (REO:52.0%, P 2 o 5 : 8.9%) were oxidized and roasted in air at 400°C for 3 hours. The formed 82.7g oxidized roasted ore was mixed evenly with 74.4g of 92% concentrated sulfuric acid by mass percentage, and then roasted at 600° C. for 1 hour. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:6, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 730ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 2 The dissolution rate was 20.0%, P 2 o 5 The dissolution rate was 3.2%.

Embodiment 3

[0031] 100g bastnaesite and monazite mixed rare earth concentrate (REO:63.5%, P 2 o 5 : 8.8%) was oxidized and roasted in air for 1 hour at 650°C to form 86.5g of oxidized roasted ore. The oxidized roasted ore was uniformly mixed with 103.8 g of concentrated sulfuric acid with a mass percentage of 85%, and then roasted at 300° C. for 1.5 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:7, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 880ml cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.18g / l, CeO 2 The dissolution rate was 37.8%, P 2 o 5 The dissolution rate was 6.8%.

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 selectively extracting non-cerium rare earth from mixed rare earth ore concentrate. The method comprises the following steps: performing air oxidation roasting onmixed rare earth ore concentrate containing bastnaesite and monazite at 400-650 DEG C for 1-3 h to generate thermal oxidation roasted ore; oxidizing trivalent cerium in the mixed rare earth ore concentrate into tetravalent cerium; uniformly mixing the thermal oxidation roasted ore and concentrated sulfuric acid and roasting the mixture at the low temperature of 150-800 DEG C for 0.5-2 h, and dissolving the oxidation roasted ore in concentrated sulfuric acid to form cerium phosphate and trivalent rare earth sulfate; performing water soaking and size mixing on cerium phosphate and trivalent rareearth sulfate, and performing solid-liquid separation to obtain a little-cerium rare earth sulfate solution and a cerium phosphate enriched product. Technical advantages that high-valent cerium is formed from bastnaesite by oxidation roasting and phosphoric acid is formed from monazite by sulfuric acid decomposition are fully combined, and fixation of cerium and phosphorus resources and selectiveexploitation of non-cerium rare earth are realized by high-stability cerium phosphate.

Description

technical field [0001] The invention relates to a hydrometallurgy technology, in particular to a method for selectively extracting non-cerium rare earths from mixed rare earth concentrates. Background technique [0002] Baiyun Obo Mine is the largest rare earth mine in my country. Rare earth minerals are mainly composed of bastnaesite and monazite, which are recognized as refractory minerals in the world. In the current production process, the high-temperature roasting decomposition process of concentrated sulfuric acid and the decomposition process of concentrated alkali solution are mainly used. In recent years, the treatment of "three wastes" in the rare earth concentrate smelting industry and the comprehensive utilization of fluorine, phosphorus and other resources have become research hotspots. The mineral disposal methods formed are almost all the integration and improvement of the past smelting process. Although they have their own characteristics, they are all It i...

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): C22B59/00C22B1/02C22B1/06C22B3/04
CPCC22B1/02C22B1/06C22B3/04C22B59/00Y02P10/20
Inventor 崔建国王哲侯睿恩徐萌高婷郝肖丽李赫孟志军谢军
Owner BAOTOU RES INST OF RARE EARTHS
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