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Method for preparing yttria of different sizes and different appearances

A technology of yttrium oxide and morphology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of difficult control of the production process, easy agglomeration of powders, ammonia wastewater treatment, etc., and achieve easy filtration, washing, and operation The effect of simplicity and easy production process

Inactive Publication Date: 2014-05-21
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to prepare yttrium oxide powders with different shapes, ammonia water or sodium hydroxide has been used as a precipitant to change the shape by changing the pH of the precipitation process. However, the product produced by this process is yttrium hydroxide , is an amorphous precipitate, it is not easy to filter and wash, the generated powder is easy to agglomerate, and the production process is not easy to control. At the same time, ammonia water also has the problem of wastewater treatment

Method used

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  • Method for preparing yttria of different sizes and different appearances
  • Method for preparing yttria of different sizes and different appearances
  • Method for preparing yttria of different sizes and different appearances

Examples

Experimental program
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Embodiment 1

[0020] Prepare 400 ml of yttrium chloride solution with a concentration of 0.5 mol / L and an acidity of 0.5 mol / L; at the same time, prepare 150 ml of an oxalic acid solution with a concentration of 380 g / L. Take 200ml of deionized water in a 2L beaker, start stirring, and flow the yttrium chloride solution and the oxalic acid solution into the beaker, and the reaction is completed within 4 minutes. After the reaction, heat and distill in a water bath at 100°C until the mother liquor is completely evaporated to dryness to produce yttrium oxalate. Filter and wash, rinse 5-8 times with deionized water, and then drain. Burn in an atmosphere furnace at 850°C, keep the temperature for 1.5 hours, and cool to room temperature to obtain yttrium oxide. Detect D50 and electron microscope, D50=19.75 microns, the shape is cubic, see figure 1 .

Embodiment 2

[0022] Prepare 400ml of yttrium chloride solution with a concentration of 1mol / L and an acidity of 3mol / L; meanwhile prepare 250ml of an oxalic acid solution with a concentration of 380g / L. Take 200ml of deionized water in a 2L beaker, start stirring, and flow the yttrium chloride solution and the oxalic acid solution into the beaker, and the reaction is completed within 10 minutes. After the reaction, heat and distill in a water bath at 100°C until the mother liquor is completely evaporated to dryness to produce yttrium oxalate. Filter and wash, rinse 5-8 times with deionized water, and then drain. Burn in an atmosphere furnace at 850°C, keep the temperature for 1.5 hours, and cool to room temperature to obtain yttrium oxide. Detect D50 and electron microscope, D50=31.11 micron, appearance is flake, see figure 2 .

Embodiment 3

[0024] Prepare 400ml of yttrium chloride solution with a concentration of 0.5mol / L and an acidity of 3mol / L; at the same time prepare 400ml of an oxalic acid solution with a concentration of 120g / L. Take 200ml of deionized water in a 2L beaker, start stirring, and flow the yttrium chloride solution and the oxalic acid solution into the beaker, and the reaction is completed within 10 minutes. After the reaction, heat and distill in a water bath at 100°C until the mother liquor is completely evaporated to dryness to produce yttrium oxalate, which is filtered and washed, rinsed with deionized water for 5-8 times, and then drained. Burn in an atmosphere furnace at 850°C, keep the temperature for 1.5 hours, and cool to room temperature to obtain yttrium oxide. Detect D50 and electron microscope. D50=12.04 microns, the morphology is a coexistence of cube and sheet, see image 3 .

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Abstract

The invention discloses a method for preparing yttria of different sizes and different appearances. According to the method, an yttria solution and an oxalic acid solution undergo settling reaction and then are heated and distilled by water bath till the mother solution is totally evaporated to dryness to generate yttrium oxalate, and yttria is obtained by filtering, washing, burning, thermally insulating and cooling to the room temperature. The production process of the method is easily controlled, and the requirements of production performance are met.

Description

technical field [0001] The invention relates to a method for preparing yttrium oxide with different particle sizes and shapes. Background technique [0002] Yttrium oxide is an important rare earth compound, which has unique heat resistance, corrosion resistance, high temperature stability, high dielectric constant and a series of excellent optical properties, and is widely used in advanced ceramics, optoelectronics, catalysts and functions High-efficiency additives for composite materials and other fields. [0003] The traditional oxalate precipitation process is used to prepare yttrium oxide, the particle size is generally 3-8 microns, and the shape is flake. The particle size and shape cannot meet the requirements of product performance. In recent years, in order to prepare yttrium oxide powders with different shapes, ammonia water or sodium hydroxide has been used as a precipitant to change the shape by changing the pH of the precipitation process. However, the product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 李来超周晓宏
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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