Preparation method of high-purity cerium oxide for compact fluorescent lamps

A cerium oxide, high-purity technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of high cost and inability to have purity, and achieve advanced technology and high environmental protection , Adaptable effect

Inactive Publication Date: 2018-12-04
连云港高品再生资源有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for preparing high-purity cerium oxide used in compact fluorescent lamps, so as to solve the problem that the existing preparation methods cannot have the advantages of high purity and low cost.

Method used

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  • Preparation method of high-purity cerium oxide for compact fluorescent lamps

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preparation example Construction

[0017] As described in the background art, the existing preparation methods cannot combine the advantages of high purity and low cost. In order to solve the above technical problems, the application provides a method for preparing high-purity cerium oxide for compact fluorescent lamps, the content of cerium oxide in high-purity cerium oxide is ≥99.99wt%, and the samples to be treated include cerium oxide and terbium oxide, The above preparation method includes: treating the sample to be treated with sulfuric acid to dissolve cerium oxide and terbium oxide to obtain a primary treatment liquid and a first solid residue; subjecting the primary treatment liquid to a precipitation reaction to obtain a rare earth precipitate containing cerium hydroxide The rare earth precipitate is neutralized with hydrochloric acid to obtain a secondary treatment solution containing rare earth chloride; the first organic extractant is used to carry out the first extraction treatment on the second tr...

Embodiment 1

[0036] use as figure 1 The shown process flow prepares high-purity cerium oxide, and the specific operation process is as follows:

[0037] The sample to be treated includes 55% cerium oxide and 35% terbium oxide and impurities.

[0038] The above-mentioned sample to be treated was dissolved with 6 mol / L sulfuric acid to obtain a primary treatment solution, wherein the ratio of the total amount of cerium oxide and terbium oxide to the molar number of sulfuric acid was 1:1.5.

[0039] Using 9 mol / L sodium hydroxide solution to convert the cerium element in the primary treatment solution into cerium hydroxide precipitate to obtain a rare earth precipitate containing cerium hydroxide. The molar ratio of rare earth oxide to sodium hydroxide is 1:1.6. After the reaction is complete, take the supernatant and test it with oxalic acid solution. If there is no precipitation, it indicates that the rare earth elements have completely precipitated.

[0040] 6 mol / L hydrochloric acid wa...

Embodiment 2

[0045] The difference from Example 1 is that the first organic extractant is a mixture of di(2-ethyl-hexyl) phosphate (P204) and kerosene at a weight ratio of 1:1.

[0046] The purity of the prepared cerium oxide product is 99.995wt%, and the yield is 91.7wt%.

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Abstract

The invention provides a preparation method of high-purity cerium oxide for compact fluorescent lamps. The preparation method includes the steps: treating a to-be-treated sample with sulfuric acid toobtain a primary treatment solution and first solid slag; carrying out a precipitation reaction of the primary treatment solution to obtain a rare earth precipitate containing cerium hydroxide; carrying out a neutralization reaction of the rare earth precipitate with hydrochloric acid to obtain a secondary treatment solution containing rare earth chloride; carrying out primary extraction treatmenton the secondary treatment solution by a first organic extractant, and then carrying out back extraction treatment on an extraction phase obtained in the primary extraction treatment process by a back-extractant, to obtain an extraction residual solution containing cerium chloride and an extraction solution containing terbium chloride; carrying out secondary extraction treatment on the extractionresidual solution with a second organic extractant to obtain a cerium chloride solution; and carrying out precipitation and burning treatment on the cerium chloride solution sequentially to obtain high-purity cerium oxide. The cerium oxide prepared by the method has the advantages of high purity, high direct yield and good environmental protection.

Description

technical field [0001] The invention relates to the field of recovery of rare earth elements, in particular to a method for preparing high-purity cerium oxide used in compact fluorescent lamps. Background technique [0002] The green powder and dark red powder in tri-primary fluorescent lamps contain fluorescent grade ceria. Tri-primary fluorescent lamps have two advantages: (1) light quality is better than incandescent lamps and ordinary fluorescent lamps; (2) energy-saving lamps have huge economic benefits. If 20% of incandescent lamps are replaced by trichromatic fluorescent lamps, the economic benefits of energy-saving lamps from now to the end of this century can reach 430 million US dollars. Because of this, tri-color fluorescent lamps are developing rapidly in the world. For example, the annual growth rate of tri-primary fluorescent lamps in the United States is greater than 15%, and the average annual growth rate of tri-primary fluorescent lamps in Japan is 15%. 50%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2006/80Y02B20/00
Inventor 张宇
Owner 连云港高品再生资源有限公司
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