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

Rare earth waste jet milling oxygen-enriched roasting process

A technology of oxygen-enriched roasting and rare earth waste, which is applied to the improvement of process efficiency and grain treatment, which can solve the problems of low oxidation rate and leaching rate, and achieve the effects of eliminating production capacity mismatch, uniform roasting, and reducing production waste

Inactive Publication Date: 2020-11-03
龙南友力稀土科技开发有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the technical problem of low oxidation rate and leaching rate of rare earth waste under this process condition in the prior art, the present invention provides an oxygen-enriched roasting process of rare earth waste in jet mill

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

[0032] A jet mill oxygen-enriched roasting process for rare earth waste, the specific steps are as follows:

[0033] Cleaning: Put the rare earth waste in an ultrasonic cleaning tank, use a degreasing agent to clean the dust and oil in the waste, take it out and dry it after cleaning; crushing: use a jaw crusher to roughly crush the dried rare earth waste into 50mm Granules, and then use the secondary crusher to crush the material into a coarse powder with a particle size of 12-15mm; primary roasting: use a sintering furnace to roast the coarse powder, the primary roasting temperature is 1050°C, and the roasting time is 1.5h. After the roasting is completed, nitrogen Air-cooled to obtain the primary roasted material; jet mill pulverization: use high-pressure nitrogen in the jet mill pulverizer, the pressure of high-pressure nitrogen is 0.6MPa, in the high-pressure nitrogen, the content of nitrogen is not less than 99.9% by volume, the primary roasted material is made of Grind ...

Embodiment 2

[0035] Put the rare earth waste in an ultrasonic cleaning tank, use a degreaser to clean the dust and oil in the waste, take it out and dry it after cleaning; use a jaw crusher to roughly crush the dried rare earth waste into 52mm particles, and then use The intermediate crusher crushes the material into a coarse powder with a particle size of 13mm; the coarse powder is roasted in a sintering furnace, the primary roasting temperature is 1085°C, and the roasting time is 2 hours. After the roasting is completed, the primary roasted material is obtained by nitrogen air cooling; Nitrogen in the jet mill pulverizer, the pressure of high-pressure nitrogen is 0.7MPa, the content of nitrogen in the high-pressure nitrogen is not less than 99.9% by volume, and the primary roasted material is ground under the working pressure of 1.3MPa to a fine particle with an average particle size of 1.8μm. Powder; mix the fine powder with the oxidant, the oxidant is silicon oxide and aluminum oxide, t...

Embodiment 3

[0037] Put the rare earth waste in an ultrasonic cleaning tank, use a degreaser to clean the dust and oil in the waste, take it out and dry it after cleaning; use a jaw crusher to roughly crush the dried rare earth waste into 50mm particles, and then use The intermediate crusher crushes the material into a coarse powder with a particle size of 15mm; the coarse powder is roasted in a sintering furnace, the primary roasting temperature is 1100 ° C, and the roasting time is 2 hours. After the roasting is completed, the primary roasted material is obtained by nitrogen air cooling; Nitrogen in the jet mill pulverizer, the pressure of high-pressure nitrogen is 0.8MPa, the content of nitrogen in the high-pressure nitrogen is not less than 99.9% by volume, and the primary roasted material is ground under the working pressure of 1.5MPa to a fine particle with an average particle size of 1.5μm. Powder; mix the fine powder with an oxidant, the oxidant is silicon oxide and aluminum oxide, ...

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a rare earth waste jet milling oxygen-enriched roasting process which comprises the following steps: adding high-pressure nitrogen into a jet milling crusher, and grinding a primary roasted material into fine powder with the average particle size of 1.5-2.5 mu m under certain working pressure, so that the particle size of a jet milling roasted material is finer, and the oxidation rate of the fine powder in an oxygen-enriched air roasting process can be effectively improved; and performing roasting under the conditions that the oxygen-enriched roasting temperature is 650-700 DEG C and the oxygen-enriched roasting time is 3-5 h, so that the leaching rate of a second-stage roasted material in the acid dissolution leaching process can be effectively increased, and the final rare earth oxide leaching rate reaches 98.3-98.7%. Compared with the prior art, the process is beneficial to acid dissolution leaching of rare earth metal, the leaching rate and the recovery rateare increased, and the adaptability of the process to raw materials is enhanced.

Description

technical field [0001] The invention relates to the technical field of rare earth waste roasting, in particular to the technical field of rare earth waste jet mill oxygen-enriched roasting. Background technique [0002] Rare earth elements are widely used in various fields of national economy and national defense industry due to their unique atomic structure and unique photoelectric and magnetic properties. Rare earth plays a vital role in transforming and upgrading traditional industries such as petrochemical, metallurgy, glass, and ceramics, as well as cultivating and developing strategic new industries such as new energy, new materials, energy conservation and environmental protection, aerospace, industrial automation, and new electronic information. For "industrial vitamins". Different types of rare earth wastes are produced in China every year. These wastes contain a large amount of rare earths, iron, aluminum and other valuable metals. The comprehensive recycling of r...

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): C22B1/02C22B7/00C22B59/00B02C19/06
CPCB02C19/06C22B1/02C22B7/007C22B59/00Y02P10/20
Inventor 程宗敏陈勇春刘建安钟琦林春雷
Owner 龙南友力稀土科技开发有限公司
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