A process for preparing high-purity ultra-fine barium titanate by an improved liquid-phase precipitation method

A fine barium titanate, liquid phase precipitation technology, applied in the field of inorganic powder synthesis, can solve the problems of complex process route, easy powder agglomeration, high energy consumption of calcination, etc., to reduce the impurity content of the product, reduce the impurity content and agglomeration of the product , the effect of increasing the heating rate

Active Publication Date: 2019-07-12
HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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  • Application Information

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Problems solved by technology

[0008] In view of the above problems, the technical problem to be solved in the present invention is to provide an improved synthesis process technology of high-purity ultrafine barium titanate powder, which solves the problems of easy powder agglomeration, high impurity content, complicated process route and high energy consumption for calcination in the traditional process. The problem

Method used

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  • A process for preparing high-purity ultra-fine barium titanate by an improved liquid-phase precipitation method
  • A process for preparing high-purity ultra-fine barium titanate by an improved liquid-phase precipitation method
  • A process for preparing high-purity ultra-fine barium titanate by an improved liquid-phase precipitation method

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Experimental program
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Effect test

Embodiment 1

[0029] Take 500ml of solution A and put it in a beaker, take 200ml of solution B and put it in a conical flask, put the beaker in a magnetic stirrer, add a polytetrafluoroethylene stirrer, turn on the strong magnetic stirrer, plug the conical flask with a rubber stopper and insert it into a tape Hang the glass tube with a flow regulating device upside down above the beaker, add solution B into the beaker at a rate of 1 drop / s, form a white precipitate and stabilize it for 30 minutes as the reaction end point, and centrifuge to obtain a white wet residue 1, which is the intermediate.

[0030] The intermediate was washed with 350 ml of deionized water, followed by solid-liquid separation, which was repeated three times to obtain solid 1.

[0031] Transfer solid 1 into a reaction kettle with a high-frequency ultrasonic device, add 560ml of deionized water to the reaction kettle, add 28g of ethylene glycol, turn on the ultrasonic oscillator, set the frequency to 25000HZ, control th...

Embodiment 2

[0035] Take 2000ml of solution A in a beaker, take 1000ml of solution B in a conical flask, place the beaker in a magnetic stirrer, add a polytetrafluoroethylene stirrer, turn on the strong magnetic stirring, plug the conical flask with a rubber stopper and insert it into a tape Hang the glass tube with a flow regulating device upside down above the beaker, add solution B into the beaker at a rate of 0.5 drops / s, form a white precipitate and stabilize it for 50 minutes as the reaction end point, and centrifuge to obtain a white wet residue 1, which is the intermediate.

[0036] After the intermediate was washed with 1500ml deionized water, the solid-liquid separation was repeated for 3 times to obtain the solid 1.

[0037] Transfer the solid 1 into a reaction kettle with a high-frequency ultrasonic device, add 2500ml of deionized water to the reaction kettle, add 125g of ethylene glycol, turn on the ultrasonic oscillator, set the frequency to 30000HZ, and the temperature to 80°...

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Abstract

The invention discloses a technology for preparing high-purity superfine barium titanate by an improved liquid-phase settling method, and relates to the technical field of synthesis of inorganic powder. The technology specifically comprises the following steps of 1, preparing an intermediate; 2, washing the intermediate by water, and grinding; 3, treating the intermediate by ultrasonic waves at high frequency; 4, calcining at high temperature; putting a solid 2 obtained in the step 3 into high-temperature calcining equipment, calcining, and dispersing, so as to obtain the high-purity superfine barium titanate. The technology has the advantages that the intermediate is ground by a nanometer grinding machine, and washed by water, so that the content of impurities in a product is greatly reduced, and the fineness of the product is improved; under the condition of stable temperature, the intermediate is treated by the ultrasonic waves at high frequency, the formed polymerizing state is crushed under the cavatition action of high-frequency ultrasonic waves, and the coated impurity ions are released, so that the content of impurities in the product and the agglomeration are further reduced.

Description

[0001] Technical field: [0002] The invention relates to a process for preparing high-purity ultrafine barium titanate by an improved liquid phase precipitation method, and belongs to the technical field of inorganic powder synthesis. [0003] Background technique: [0004] Barium titanate powder is the main raw material of electronic ceramic components. High-purity ultra-fine powder technology is an important guarantee for components with high performance and low loss. Key technical links. At present, the industrialized barium titanate powder synthesis technologies mainly include high-temperature solid-phase method, hydrothermal synthesis method and liquid-phase precipitation method. Restrictions such as unstable quality are mainly used for the synthesis of low-end barium titanate powder; hydrothermal synthesis generally has the problems of harsh production process conditions, high equipment material requirements, and low output. [0005] The traditional liquid-phase precip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/626
CPCC04B35/468C04B35/626C04B35/62675
Inventor 彭铁缆冷中方张学华
Owner HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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