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Europium sulfate decomposition method

A europium sulfate re-decomposition technology, applied in chemical instruments and methods, rare earth metal sulfates, rare earth metal carbonates, etc., can solve the problems of high production cost, high price, large heat energy, etc., and achieve low cost, Energy saving and simple operation

Inactive Publication Date: 2016-07-20
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods all need heating, consume a lot of heat energy, nitric acid and sodium carbonate are more expensive, and the production cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] At room temperature, add 50Kg of europium sulfate into 100L of hydrochloric acid solution with a concentration of 4mol / L and stir for 10 minutes; then add 5Kg of 50% hydrogen peroxide and stir for 5 hours; finally add 150L of water to dilute, filter, and the filter residue is The decomposed europium sulfate weighs 3Kg, and returns to decompose again. The filtrate is a mixed solution of europium sulfate and europium chloride, and ammonia water is added to precipitate to prepare europium hydroxide. After analysis, the decomposition rate of europium sulfate was 93%.

Embodiment 2

[0016] At room temperature, add 50Kg of europium sulfate into 185L of hydrochloric acid solution with a concentration of 10mol / L and stir for 20 minutes; then add 15Kg of 30% hydrogen peroxide and stir for 3 hours; finally add 200L of water to dilute, filter, and the filter residue is The decomposed europium sulfate weighs 0.25Kg, and returns to decompose again. The filtrate is a mixed solution of europium sulfate and europium chloride, and ammonium bicarbonate is added for precipitation to prepare europium carbonate. After analysis, the decomposition rate of europium sulfate was 99.5%.

Embodiment 3

[0018] At room temperature, add 50Kg of europium sulfate into 250L of hydrochloric acid solution with a concentration of 5mol / L and stir for 30 minutes; then add 25Kg of 20% hydrogen peroxide and stir for 1 hour; finally add 120L of water to dilute, filter, and the filter residue is The undecomposed europium sulfate, weighing 1Kg, is returned for re-decomposition treatment, and the filtrate is a mixed solution of europium sulfate and europium chloride, and ammonium bicarbonate is added for precipitation to prepare europium carbonate. After analysis, the decomposition rate of europium sulfate was 98%.

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Abstract

An europium sulfate decomposition method is characterized in that europium sulfate is added to a hydrochloric acid solution according to the 1: (2-6): (1-0.5) mass ratio of the europium sulfate to the hydrochloric acid solution to hydrogen peroxide, and stirring is performed for 10-30 minutes; then the hydrogen peroxide is added, and stirring is performed for 1-5 hours; finally, water is added for dilution according to the (0.5-4):1 mass ratio of the water to the hydrochloric acid solution, filtration is performed, filter residues are returned for re-decomposition treatment, and filtrate is used for crude europium preparation. The europium sulfate decomposition method adopts the hydrogen peroxide to decompose the europium sulfate in the hydrochloric acid solution, replaces a traditional nitric acid or alkali heating decomposition process, reduces the energy consumption and is simple in operation and low in cost.

Description

technical field [0001] The invention relates to a method for decomposing europium sulfate. Background technique [0002] Europium is a good luminescent material activator, such as: Eu 3+ Is the activator of red luminescent material, Eu 2+ It is an activator for blue luminescent materials. Europium oxide, as an activator for luminescent materials, is widely used in LEDs, tricolor energy-saving lamps, high-definition display screens, and new X-ray medical diagnostic systems. At the same time, europium oxide can also be used in lasers, superconducting materials, magnetic bubble storage devices, control materials, shielding materials and structural materials of atomic reactors. Therefore, europium oxide has shown an extremely important position and role in the rapidly developing photoelectric new material technology. [0003] The purification process for the production of high-purity europium oxide by alkalinity reduction is mainly to use zinc powder to reduce trivalent euro...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01F17/224C01F17/247
CPCC01F17/282C01F17/36C01F17/247C01F17/224
Inventor 刘志强邱显扬张魁芳曹洪杨李伟郭秋松高远朱薇金明亚
Owner GUANGDONG INST OF RARE METALS
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