Preparation method of yttrium oxide with central grain size being 20-50 microns

A central particle size, yttrium oxide technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of excessive ammonia nitrogen, not meeting wastewater discharge standards, etc., and achieve high bulk density. , Easy to filter and wash, easy to handle effect

Inactive Publication Date: 2016-10-26
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN200710121460.X introduces a preparation method of large-grained yttrium oxide. Ammonium bicarbonate is used as a precipitating agent. Although large-grained yttrium oxide can be obtained, the ammonia nitrogen in the wastewater will exceed the standard, which does not meet the wastewater discharge standard.

Method used

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  • Preparation method of yttrium oxide with central grain size being 20-50 microns
  • Preparation method of yttrium oxide with central grain size being 20-50 microns

Examples

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Embodiment 1

[0021] Add 30L of deionized water into the enamel pot, the temperature is 35°C, and start stirring. The concentration of yttrium chloride solution is 50g / L, the acidity is 3mol / L, and the concentration of oxalic acid solution is 117g / L. Add the yttrium chloride solution and the oxalic acid solution to the precipitation pot at a mass ratio of 1:1.8. After the addition, add oxalic acid to make the mass ratio reach 1:2.5. After the reaction was complete, stir for 10 minutes. Turn on the steam for heating, the temperature is controlled at 95-100°C, and stop heating when the acidity at the end point reaches 6.8mol / L. discharge. Wash 6-10 times with deionized water and drain. Incubate at 1000°C for 3 hours. to obtain yttrium oxide. Center particle size D 50 =27.31 microns, bulk density is 1.32g / cm 3 , the specific surface area is 26070 cm 2 / g, the total amount of rare earth is 99.02%, impurity content: Fe 2 o 3 is less than 2ppm, SiO 2 is less than 10ppm, and CaO is 8ppm...

Embodiment 2

[0023] Add 40L of deionized water into the enamel pot, the temperature is 45°C, and start stirring. The concentration of yttrium chloride solution is 62g / L, the acidity is 3.5mol / L, and the concentration of oxalic acid solution is 108g / L. Add the yttrium chloride solution and the oxalic acid solution to the precipitation pot at a mass ratio of 1:2. After the addition, add oxalic acid to make the mass ratio reach 1:2.5. After the reaction was complete, stir for 10 minutes. Turn on the steam for heating, the temperature is controlled at 95-100°C, and stop heating when the acidity at the end point reaches 8mol / L. discharge. Wash 6-10 times with deionized water and drain. Incubate at 1000°C for 4 hours. to obtain yttrium oxide. Center particle size D 50 =45.21 microns, bulk density is 1.42g / cm 3 , with a specific surface area of ​​20000 cm 2 / g, the total amount of rare earth is 99.15%, impurity content: Fe 2 o 3 is less than 2ppm, SiO 2 is less than 10ppm, CaO is 10ppm...

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Abstract

The invention discloses a preparation method of yttrium oxide with central grain size being 20-50 microns. The preparation method comprises steps as follows: 30-60 L of deionized water at a temperature of 35-45 DEG C is added to a precipitation pot; mixing is started, a yttrium chloride solution and an oxalic acid solution are added to the precipitation pot, wherein the rare earth concentration of the yttrium chloride solution is 30-70 g / L, the acidity is 3-5 mol / L and is adjusted with hydrochloric acid, the concentration of the oxalic acid solution is 100-120 g / L, the mass ratio of the added yttrium chloride solution to the oxalic acid solution is controlled to be 1:1.5-1:2, and the oxalic acid is replenished after the addition, the mass ratio of the yttrium chloride solution and the oxalic acid solution is controlled to be 1:2.5-1:3; after complete reaction, steam is opened, the mixture is heated to 95-100 DEG C for constant-temperature distillation, and heating is stopped after the endpoint acidity is 6-8 mol / L; discharging is performed, yttrium oxalate is washed and burnt, and large-granularity yttrium oxide with central grain size being 20-50 microns can be obtained.

Description

technical field [0001] The invention relates to a method for preparing yttrium oxide with a central particle diameter of 20-50 microns. 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] In recent years, with the continuous development of the rare earth industry, the application of rare earths has continued to deepen, and new material technology has flourished. For example, the requirements of contrasting surface area, particle size, fluidity, different powder particle sizes, and different market demands. In the past, small particle rare earth oxides had special application fields, and today large particle rare earth oxides also have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2004/52C01P2004/61C01P2006/11C01P2006/12
Inventor 周晓宏喻小珍傅志勤余建勇曾辉辉
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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