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Separation and purification method of rare earth metals in phosphor powder

A purification method and technology of rare earth metals, applied in the field of separation and purification of rare earth metals in fluorescent powder, can solve the problems of low separation efficiency and complicated operation, and achieve the effect of simple operation and low price of equipment

Active Publication Date: 2013-03-06
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for separating and purifying rare earth metals in fluorescent powder, so as to solve the problems of low separation efficiency and complicated operation in existing methods

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  • Separation and purification method of rare earth metals in phosphor powder
  • Separation and purification method of rare earth metals in phosphor powder

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Embodiment Construction

[0028] Please refer to figure 1 and figure 2 , by collecting the rare earth elements in the CRT fluorescent powder as an example, the separation and purification method of the present invention will be specifically analyzed.

[0029] The method for separating and purifying rare earth metals in fluorescent powder of the present invention mainly includes a first process of enriching rare earth elements and a second process of chemical vapor transport of rare earth elements.

[0030] Among them, such as figure 1 As shown, the enrichment process of rare earth elements further includes the following steps:

[0031] (1) Dissolve the fluorescent powder in the CRT in dilute sulfuric acid, stir well, and filter with suction to obtain the filtrate containing rare earth ions, and recover the filter cake containing barium sulfate and lead sulfate;

[0032] (2) Add the fluoride salt solution to the filtrate containing rare earth ions, react to generate rare earth fluoride, filter with ...

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Abstract

The invention relates to a separation and purification method of rare earth metals in phosphor powder. The method mainly comprises technologies of enrichment of the rare earth elements, acquirement of rare earth oxide, and chemical vapor transportation of the rare earth elements. The chemical vapor transportation technology of the rare earth elements further comprises a chlorination reaction of the rare earth oxide into rare earth chloride, a reaction of sublimated anhydrous AlCl3 and the rare earth chloride to generate a rare earth compound gas RAlnCl3+3n, and distillation, gradient cooling and recycling of the rare earth compound gas to obtain a single rare earth chloride. The method is simple to operate, high in recovery efficiency, low in cost and easy to industrialize.

Description

technical field [0001] The invention relates to a method for recycling phosphor powder, in particular to a method for separating and purifying rare earth metals in phosphor powder. Background technique [0002] Rare earth elements and their compounds are increasingly used in various materials, such as: high-performance magnetic materials, fluorescent materials, chemical sensors, high-temperature semiconductors, magnetic disks and nickel-iron alloys and other materials. Therefore, the separation of different rare earth elements from these materials has become an urgent problem to be solved. Two methods have been used in commercial production, one is based on solid-liquid system, using fractional crystallization or precipitation separation, and the other is based on liquid-liquid system, using ion exchange or solvent extraction The above two methods all need multiple cycles, and the separation efficiency is low. Contents of the invention [0003] The technical problem to b...

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 马琳石玉洁王勤苏陶贵闫梨王阳烨严杰
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE