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Method for recycling rare earth element yttrium from waste fluorescent powder and preparing resin surface composite coating

A technology of rare earth elements and surface compounding, which is applied in the field of solid waste resource utilization, can solve the problems of the process technology that seldom wastes phosphor powder to be directly used after recycling, and achieves high leaching efficiency, short reaction time, improved hardness and durability. The effect of grinding performance

Active Publication Date: 2016-12-07
常州厚德再生资源科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In the current research, there are many technologies for recycling rare earths from waste phosphor powder, which are mainly divided into acid leaching method, alkali fusion method, extraction method and precipitation method, but there are few processes that can directly use waste phosphor powder after recycling technology

Method used

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  • Method for recycling rare earth element yttrium from waste fluorescent powder and preparing resin surface composite coating

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Effect test

Embodiment 1

[0040] A method for recovering rare earth element yttrium from waste fluorescent powder and preparing a resin surface composite coating, comprising the following seven steps:

[0041] 1) Screening pretreatment step: after the preliminary crushed waste fluorescent powder is gradually screened through 20 mesh, 60 mesh, 100 mesh, and 200 mesh screens, the 200 mesh undersize is collected, and the undersize accounts for the unsifted powder. 99.9% or more.

[0042] 2) Oxidative acid leaching step: Add sulfuric acid and hydrogen peroxide to the sieved fluorescent powder according to the solid-to-liquid ratio of 1g:30ml for leaching reaction. The concentration of sulfuric acid is 3mol / L, and the volume ratio of hydrogen peroxide and sulfuric acid is 0.04. The reaction was carried out for 60 minutes, and filtered after the reaction to obtain a leach solution containing rare earth elements. The leaching rates of yttrium and europium in the fluorescent powder are both higher than 99.9%....

Embodiment 2

[0048] Embodiment 2: a method for recovering rare earth element yttrium from waste fluorescent powder and preparing a composite coating on the surface of conductive plastics, including the following seven steps:

[0049] 1) Screening pretreatment step: After the preliminary crushed waste fluorescent powder is gradually screened through 20 mesh, 60 mesh, 100 mesh, and 200 mesh screens, the 200 mesh sieves are collected, and the content of rare earth elements in the sieves accounts for More than 99.9% of unsieved powder.

[0050] 2) Oxidative acid leaching step: Add hydrochloric acid and hydrogen peroxide to the sieved fluorescent powder according to the solid-to-liquid ratio of 1g:35ml for leaching reaction. The concentration of hydrochloric acid is 6mol / L, and the volume ratio of hydrogen peroxide and hydrochloric acid is 0.06. The reaction was carried out for 80 minutes, and filtered after the reaction to obtain a leach solution containing rare earth elements. The leaching r...

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Abstract

The invention discloses a method for recycling rare earth element yttrium from waste fluorescent powder and preparing a resin surface composite coating, and belongs to the field of solid waste resource utilization. The method comprises the following steps of: mechanically crushing a waste CRT fluorescent screen and screening the crushed waste CRT fluorescent screen through a screen with certain mesh number to remove impurities such as glass, thereby obtaining fluorescent powder oriented powder; carrying out oxidizing and acid-leaching treatment on the screened fluorescent powder, and leaching out rare earth elements in the fluorescent powder; extracting most of yttrium and a small part of europium through a multi-stage extracting method, reversely extracting to obtain a yttrium chloride solution, and regulating the pH value of the yttrium chloride solution until white precipitates just appear; adding the yttrium chloride solution into an ammonium hydrogen carbonate solution containing a dispersing agent drop by drop to prepare a precursor; drying and roasting the precursor to obtain nano yttrium oxide powder; and finally, adding the nano yttrium oxide powder into a plating solution containing the dispersing agent to prepare a composite electroplating solution, and electroplating the composite electroplating solution to a conductive plastic surface prepared from resin and carbon-series conductors.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to a method for recovering rare earth element yttrium from waste fluorescent powder and preparing a resin surface composite coating. Background technique [0002] my country is the country with the most abundant rare earth resources. The output and reserves of rare earths rank first in the world. The rare earth minerals are complete in variety and the production cost is low. However, due to my country's poor management and control of the rare earth mining industry, a large number of predatory mining, cheap exports and rapid increase in domestic demand, China's rare earth reserves have dropped sharply from 74% 50 years ago to 23% today, and China continues to supply the world. More than 95% of demand. In addition, China's domestic demand for rare earths is also increasing sharply, increasing by as much as three times in just five years from 2002 to 2007....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C25D15/00
CPCC22B7/007C22B59/00C25D15/00Y02P10/20
Inventor 陈希谭哲王怀栋吴玉锋
Owner 常州厚德再生资源科技有限公司
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