Preparation method of large-granule cerous oxalate precursor

A technology of cerium oxalate and precursor, which is applied in the field of chemical materials, can solve the problems of small particles of precursor cerium oxalate, nucleation rate, and unsatisfactory growth rate, etc., and achieve good results

Inactive Publication Date: 2016-04-20
李荣
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Problems solved by technology

Solve the problem that the current preparation of rare earth cerium oxide precursor cerium oxalate has un...

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  • Preparation method of large-granule cerous oxalate precursor
  • Preparation method of large-granule cerous oxalate precursor
  • Preparation method of large-granule cerous oxalate precursor

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Embodiment Construction

[0025] The present invention will be described in detail below in combination with specific embodiments.

[0026] The invention divides the precipitation process into two processes of nucleation and growth through a special precipitator, and studies the influence of different operating conditions on the precipitation kinetic parameters (nucleation rate and growth rate); simultaneously studies the nucleation process and the growth process Influence of various factors on particle agglomeration, the rare earth cerium oxide precursor cerium oxalate (C 6 Ce 2 o 12 ) preparation method and the control method of cerium oxalate aggregates, the inventor has obtained the optimal production method of the large particle cerium oxalate precursor according to a large number of theoretical basis and experimental verification, and using a self-made nucleator, the steps of the present invention are as follows figure 1 Shown:

[0027] Step 1: Prepare cerium carbonate solution Ce(NO 3 ) 3 T...

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Abstract

The invention discloses a preparation method of a large-granule cerous oxalate precursor, which comprises the following steps: preparing a cerous carbonate solution with the Ce(NO3)3 concentration of 0.02 mol/L; preparing a precipitant oxalic acid solution with the H2C2O4.2H2O concentration of 0.15 mol/L; in the nucleation stage, adding the cerous carbonate solution into a nucleation device, and dropwisely adding the oxalic acid solution into the nucleation device while continuously stirring, wherein the dropwise addition rate is 10ml/minute, and the reaction temperature is 298K; meanwhile, starting a stirring paddle in an electric heating reaction kettle, wherein the stirring rate is 200 rpm, and the reaction time is 15.97 minutes; and filtering the granules generated in the solution, and drying to obtain the cerous oxalate large-granule precursor. The method has favorable effects on nucleation rate and growth rate in the rare-earth cerium oxide precursor cerous oxalate preparation process, and can be used for preparing the large-granule precursor cerous oxalate.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to a preparation method of a large particle cerium oxalate precursor. Background technique [0002] The widespread application of rare earth oxides in fine ceramic materials is only nearly 20 years old. A large number of domestic and foreign researchers of ceramic materials have proved that the addition of rare earth oxides as stabilizers and sintering aids to different fine ceramic materials can greatly improve and improve the technical indicators such as strength and toughness of certain structural ceramic materials. Reduce its reaction sintering temperature, thereby reducing production costs; at the same time, rare earth oxides also play a very important role in functional ceramic materials such as semiconductor gas sensor materials, microwave dielectric materials, and piezoelectric ceramic materials. [0003] The three fields with the fastest growth in rare earth appli...

Claims

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Application Information

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IPC IPC(8): C07F5/00
CPCC07F5/003
Inventor 李荣郭江杜新玲姚娜宋玉安周鸿燕兴超苏小莉崔海燕尚光贞
Owner 李荣
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