Recovery method of waste rare earth polishing powder

A technology of rare earth polishing powder and recovery method, applied in the direction of improving process efficiency, silicate, alkali metal silicate, etc., can solve the problems of consuming hydrochloric acid, difficult to industrialize production, etc., and achieve the effect of solving pollution

Active Publication Date: 2017-03-15
NORTHEASTERN UNIV
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent requires harsh reaction conditions such as high temperature conditions (temperature is 1000°C) and vacuum (system pressure is 10Pa) and supporting production equipment, so it is difficult to realize industrial production
What the Chinese patent (publication number is CN102051487A) describes is to mix waste CRT glass powder, activated carbon and strong alkali, and after melting and reacting, separate crude lead, lye and alkali slag, then use dilute hydrochloric acid to soak the alkali slag to extract the residual lead, this patent does not reduce lead through deep reduction technology, but also needs to use hydrochloric acid to post-treat the alkali slag, which consumes a lot of hydrochloric acid
After analysis, this patent is not applicable to the separation of rare earth, metal lead and silicon

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
  • Recovery method of waste rare earth polishing powder
  • Recovery method of waste rare earth polishing powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0044] Crushing, grinding and drying the waste rare earth polishing powder, the particle size is below 20μm;

[0045] The chemical composition of waste rare earth polishing powder, as shown in table 1;

[0046] The particle size of activated carbon powder, coke powder or coal powder is below 120 mesh.

[0047] Table 1

[0048]

Embodiment 1

[0050] A kind of recovery method of waste rare earth polishing powder, comprises the following steps:

[0051](1) Weigh 10.013g of waste rare earth polishing powder, 0.194g of coke powder (89% fixed carbon content) and 17.842g of sodium hydroxide, and mix them uniformly in a mixer to obtain a mixture; wherein: by molar ratio, waste rare earth Lead oxide in the polishing powder: solid carbon in the reducing agent = 1: 2.06; in molar ratio, silicon dioxide in the waste rare earth polishing powder: sodium hydroxide = 1: 5.05;

[0052] (2) Place the mixture in a magnesia crucible, place the magnesia crucible in a muffle furnace, and perform a reduction reaction. The reduction reaction temperature is 800° C., and the reduction reaction time is 120 minutes to obtain a reduction product;

[0053] (3) water quenching the reduction product to room temperature to obtain a cooled product;

[0054] (4) The cooled product is subjected to hydrocyclone separation to obtain a mixture of rare...

Embodiment 2

[0057] A kind of recovery method of waste rare earth polishing powder, comprises the following steps:

[0058] (1) Weigh 10.012g of waste rare earth polishing powder, 0.104g of activated carbon powder (fixed carbon content is 99%) and 17.840g of sodium hydroxide, and mix them uniformly in a mixer to obtain a mixture; wherein: by molar ratio, waste rare earth Lead oxide in the polishing powder: solid carbon in the reducing agent = 1: 1.24; in molar ratio, silicon dioxide in the waste rare earth polishing powder: sodium hydroxide = 1: 5.05;

[0059] (2) Place the mixture in a magnesia crucible, place the magnesia crucible in a muffle furnace, and perform a reduction reaction. The reduction reaction temperature is 650° C., and the reduction reaction time is 120 minutes to obtain a reduction product;

[0060] (3) water quenching the reduction product to room temperature to obtain a cooled product;

[0061] (4) The cooled product is subjected to hydrocyclone separation to obtain 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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

A recovery method of waste rare earth polishing powder comprises the following steps: weighing waste rare earth polishing powder, a reducing agent and strong base according to a ratio, uniformly mixing, and carrying out a reduction reaction at 600-800 DEG C for 60-240 min to obtain a reduction product; carrying out water quenching on the reduction product to room temperature to obtain a cooled product; carrying out hydrocyclone separation on the cooled product to obtain a mixture of a rare earth-rich material and a silicate aqueous solution and metallic lead; and filtering the mixture of the rare earth-rich material and the silicate aqueous solution to obtain the silicate aqueous solution and the rare earth-rich material. The pollution of lead in the waste rare earth polishing powder to the environment is solved, and resource utilization of valent rare earth, lead and silicon in the waste rare earth polishing powder is realized. The content of lead in the rare earth-rich material after the technical treatment is negligible. Leaching toxicity of heavy metal in the rare earth-rich material meets the national standard, and harmless, reduction and resource treatment of the waste rare earth polishing powder are realized. The method is in line with the goals of our national circular economy development and energy conservation and emission reduction.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of hazardous solid waste treatment, and in particular relates to a recovery method of waste rare earth polishing powder. [0003] Background technique: [0004] The most important process in material surface processing technology is the polishing process, and polishing powder is one of the key materials in the polishing process, which has a great impact on the quality of the polished product. As an important optical glass polishing material, rare earth polishing powder has many advantages, such as: good crystal shape, good chemical activity, high density and hardness, high polishing efficiency, stable layer photometry and long service life, so it is called "King of polishing powder", and gradually replaced other polishing powder materials and has developed rapidly in the polishing industry. It is widely used in the fine grinding of optical and photoelectric glass, jewelry, building materials, molds an...

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): C22B59/00C22B7/00C22B13/00C01B33/32
CPCC01B33/32C22B7/00C22B13/00C22B59/00Y02P10/20
Inventor 史培阳王希鑫丁文清李鑫哲赵化源
Owner NORTHEASTERN UNIV
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