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A method for clear and segmented recovery of rare earth elements from rare earth polishing powder waste slag

A rare earth polishing powder and rare earth element technology, applied in the field of comprehensive utilization of waste resources, can solve the problems of large proportion of process waste, large amount of concentrated sulfuric acid, complicated process realization, etc. The effect of overall recovery

Active Publication Date: 2015-09-02
江苏广晟健发再生资源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The domestic patent "A method for preparing lanthanum cerium oxalate from rare earth polishing powder waste residue" (Patent No.: 201210155031.5) uses concentrated sulfuric acid to leach the waste residue to recover rare earth elements. In the actual application process, there are high process costs and concentrated Limitations such as the amount of sulfuric acid is too large, the product can not ensure the purity requirements, etc.
The domestic patent "A method for preparing rare earth oxides from rare earth polishing powder waste residue" (application number: 201310063829.1) adopts the technical scheme of alkali roasting, followed by hydrochloric acid acidification, and finally obtains two types of lanthanum cerium oxide mixtures, and the process is relatively complicated. , high process cost and large proportion of process waste

Method used

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  • A method for clear and segmented recovery of rare earth elements from rare earth polishing powder waste slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take a batch of rare earth polishing powder waste slag, and its composition is as follows after testing (dry slag, unit: g / Kg dry slag):

[0035] TREO CeO 2 / TREO La 2 o 3 / TREO PR 6 o 11 / TREO 806.2 499.6 260.4 46.2 / CeO 2 / TREO La 2 o 3 / TREO PR 6 o 11 / TREO / 61.97% 32.30% 5.73% Ca element (calculated as CaO) Mg (as MgO) Al element (as Al 2 o 3 count) Si element (as SiO 2 count) 13.4 7.8 13.1 44.5 Visible impurities (wool pads, foam crumbs, etc.) 115.0

[0036] (1) Take a batch of rare earth polishing powder waste slag (1000Kg after being converted into dry slag), and separate the obvious impurities after adding appropriate water according to the requirements of physical separation.

[0037] (2) Add 900L hydrochloric acid (10mol / L) to the above polishing powder waste residue for acid hydrolysis once, control the temperature at 60°C, and take a sample after 3.5 ho...

Embodiment 2

[0049] Take a batch of rare earth polishing powder waste slag, and its composition is as follows after testing (dry slag, unit: g / Kg dry slag):

[0050] TREO CeO 2 / TREO La 2 o 3 / TREO PR 6 o 11 / TREO 856.0 643.3 172.6 46.1 / CeO 2 / TREO La 2 o 3 / TREO PR 6 o 11 / TREO / 75.15% 20.16% 4.69% Ca element (calculated as CaO) Mg (as MgO) Al element (as Al 2 o 3 count) Si element (as SiO 2 count) 10.8 5.2 12.8 33.2 Visible impurities (wool pads, foam crumbs, etc.) 82.0

[0051] (1) Take a batch of rare earth polishing powder waste slag (1000Kg after being converted into dry slag), and separate the obvious impurities after adding appropriate water according to the requirements of physical separation.

[0052] (2) Add 950L hydrochloric acid (8mol / L) to the above polishing powder waste residue for acid hydrolysis once, control the temperature at 80°C, take a sample after 4 hours of r...

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Abstract

The invention discloses a method for performing clear segmented recycling on rare earth elements from rare earth polishing powder waste residues. The method comprises the following steps: by utilizing the technical scheme of segmented extraction, sorting the components aiming at ineffective polishing powder particles in the polishing powder waste residues, extracting elements La and Pr from the ineffective polishing powder particles in a first section of the link, and extracting element Ce from the ineffective polishing powder particles in a second section of the link; realizing rare earth metal clear separation and recovery based on the two-section process flow; and respectively removing the impurity components and impurity elements in the waste residues on different process sections through a chemical method, so that high physical indexes of the product are ensured. The invention provides a method through which the resource efficiency is high, the process condition is mild, the process flow is simple and convenient and the product accords with the high physical indexes.

Description

technical field [0001] The invention relates to a method for recovering rare earth elements from rare earth polishing powder waste residue, and belongs to the technical field of comprehensive utilization of waste resources. Background technique [0002] Rare earth polishing powder is widely used in precision polishing of display screens, electronic glass, optical glass, ornaments, building materials, molds and precision instruments because of its unique physical and chemical properties and excellent polishing performance. At present, the most widely used rare earth polishing powder is cerium-based polishing powder. Due to its advantages of fast polishing speed, smoothness and high flatness, it is widely used in the polishing of optical lenses, liquid crystal displays, tablet computers, mobile phone panels, and glass substrates for making hard disks. . At present, there are about 15 large-scale enterprises producing cerium-based rare earth polishing powder in China, with an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02W30/54Y02P10/20
Inventor 梁浩梁健
Owner 江苏广晟健发再生资源股份有限公司