Treatment method for rare earth phosphate rock and enrichment method for rare earth

A treatment method and rare earth technology, which is applied in the treatment of rare earth phosphate ore and the enrichment of rare earth, can solve the problems of difficult rare earth independent minerals and phosphate ore effective separation, unfavorable recovery of rare earth elements, etc.

Active Publication Date: 2013-07-03
GRIREM ADVANCED MATERIALS CO LTD
View PDF7 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because decomposing monazite requires relatively harsh conditions, such as higher temperature and pH, etc., when using the sulfuric acid method in the prior art to wet process phosphate rock containing monazite, it is often impossible to take into account the complete decomposition of monazite while improving The enrichment degree of rare earth in phosphoric acid is

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 approach

[0042] An embodiment of enriching rare earths from rare earth phosphate rocks provided by the present invention comprises the following steps:

[0043] (1) mixing rare earth phosphate rock with phosphoric acid to form a slurry;

[0044] (2) Add concentrated sulfuric acid in the above-mentioned mixed slurry, the control mode of the addition rate of sulfuric acid is: first make the Ca in the described mixed slurry 2+ Concentrations are reduced from at least 1 wt% to Ca 2+ and SO 4 2- The equilibrium concentration, and then make the SO in the mixed slurry 4 2- concentration from Ca 2+ and SO 4 2- The equilibrium concentration of is raised to at least 2wt%, and the mixed slurry is heated during the process of adding concentrated sulfuric acid to dissolve the rare earth phosphate rock to obtain hemihydrate gypsum;

[0045] (3) recrystallizing the hemihydrate gypsum obtained in step (2) to obtain dihydrate gypsum;

[0046] The rare earth phosphate rock also contains monazit...

Embodiment 1

[0076] ①. Preparation of mixed slurry: Take 100g of rare earth phosphate rock, which contains 13g of monazite ore, and the rare earth content in the phosphate rock is 7.8wt%. According to the liquid-solid ratio of 10:1, the rare earth phosphate rock and the P containing 20wt% 2 o 5 Phosphoric acid solution, stirred evenly to obtain mixed slurry;

[0077] 2. Add nucleating agent: add 30g of calcium sulfate seed crystals and 0.1g of polyethylene glycol additive to the mixed slurry, and stir evenly;

[0078] 3. Add concentrated sulfuric acid: slowly add the concentrated sulfuric acid that concentration is 98wt% in the mixed slurry, heat mixed slurry to 150 ℃ simultaneously, when heating mixed slurry, control the weight of the Al ion in the mixed slurry, Fe ion and (with their oxide) accounts for 0.1wt% of the weight of the rare earth phosphate rock. Stir the reaction for 5 hours to make the Ca in the mixed slurry 2+ Decrease from 2wt% to Ca 2+ and SO 4 2- After the equilib...

Embodiment 2

[0086] 1. Preparation of mixed slurry: take 100g of rare earth phosphate rock, which contains 3g of monazite ore, 2g of pericite (Ce, Th)O 2 , the content of rare earth in phosphate rock is 3.4wt%. According to the liquid-solid ratio of 1:1, the rare earth phosphate rock and the P containing 50wt% 2 o 5 Phosphoric acid solution, stirred evenly to obtain mixed slurry;

[0087] 2. Nucleating agent addition: add 15g of calcium sulfate seed crystals and 0.3g of polyvinyl alcohol additive to the mixed slurry, and stir evenly;

[0088] 3. Add concentrated sulfuric acid: slowly add the concentrated sulfuric acid that concentration is 98wt% in the mixed slurry, heat mixed slurry to 88 ℃ simultaneously, when heating mixed slurry, control the weight sum of the Fe ion and Si ion in the mixed slurry (with their oxide) accounts for 0.3wt% of the weight of the rare earth phosphate rock. Stir the reaction for 5 hours to make the Ca in the mixed slurry 2+ Decrease from 2.5wt% to Ca 2+ a...

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 treatment method for a rare earth phosphate rock and an enrichment method for rare earth. The treatment method comprises the following steps: mixing the rare earth phosphate rock and phosphoric acid to form mixed slurry; adding concentrated sulfuric acid into the mixed slurry in such a manner that the concentration of Ca<2+> in the mixed slurry is decreased from at least 1 wt% to the equilibrium concentration of Ca<2+> and SO4<2->, then the concentration of SO4<2-> in the mixed slurry is increased from the equilibrium concentration of Ca<2+> and SO4<2-> to at least 2 wt% and the mixed slurry is added during addition of the concentrated sulfuric acid to allow the rare earth phosphate rock to be dissolved so as to obtain hemihydrate gypsum; and subjecting the obtained hemihydrate gypsum to recrystallization to obtain dihydrate gypsum. The enrichment method for rare earth comprises a step of recovering rare earth elements from liquid obtained after recrystallization of the hemihydrate gypsum and/or liquid obtained after heating of the mixed slurry. In the process of generation of the hemihydrate gypsum, the addition speed of the concentrated sulfuric acid is controlled, and SO4<2-> in the mixed slurry is allowed to be insufficient at first and then controlled to be excess, which aids rare earth in entering into the phosphoric acid.

Description

technical field [0001] The invention relates to an ore processing method, in particular to a processing method for rare earth phosphate rock and a method for enriching rare earth. Background technique [0002] In addition to the occurrence of rare earth in various rare earth ores, a considerable part of the rare earths in nature is symbiotic with apatite and phosphorite ores. The ionic radius of rare earth (0.848~0.106nm) and Ca 2+ (0.106nm) is very close. In phosphate rock, rare earths occur in phosphate rock in the form of isomorphism. With the P 2 o 5 As the grade increases, the content of rare earth elements increases, and the two show a positive and negative relationship. [0003] In the prior art, the methods for recovering rare earths from phosphate rock are mainly divided into wet method and thermal method. In the wet method, it can be divided into nitric acid method, hydrochloric acid method and sulfuric acid method according to the different decomposition acids...

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): C22B59/00C22B3/08
CPCY02P10/20
Inventor 王良士黄小卫龙志奇于瀛赵娜李明来李红卫
Owner GRIREM ADVANCED MATERIALS CO LTD
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