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Method for preparing barium metatitanate by adopting slurry fixation method

A technology of barium metatitanate and immobilization method, which is applied in the direction of titanate, alkaline earth metal titanate, chemical instruments and methods, and can solve the problems of low chemical purity of barium metatitanate, difficulty in guaranteeing product quality, and high hardness , to achieve the effect of low production cost and easy implementation

Inactive Publication Date: 2017-08-11
SHANDONG DONGJIA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Either these preparation methods cannot meet the needs of large-scale industrialization, or the prepared barium metatitanate has disadvantages such as low chemical purity and insufficient uniformity of particles.
Unable to meet the high-purity, ultra-fine, narrow particle size distribution and other characteristic requirements of the modern material industry
Therefore, most of the current methods for preparing barium metatitanate still use the solid-phase method, but the preparation method of the solid-phase method takes a long time, consumes high energy, produces large particles with high hardness, poor product uniformity, and difficult to guarantee product quality. Difficult to apply in high-end ceramic materials

Method used

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  • Method for preparing barium metatitanate by adopting slurry fixation method
  • Method for preparing barium metatitanate by adopting slurry fixation method
  • Method for preparing barium metatitanate by adopting slurry fixation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] After beating and stirring 1 L of metatitanic acid solution that has been heated to 20°C for 30 minutes, the concentration is controlled at 300 g / L, the stirring speed is controlled at 20 rpm, and analytically pure ammonium bicarbonate is slowly added to the beating tank, and the reaction is until no Until obvious bubbles are produced, stop adding ammonium bicarbonate, continue to stir for 20 minutes, put the material into the washing storage tank, put it into the centrifuge for washing treatment, and after drying, put the material into the beating tank and continue to prepare with deionized water Titanium dioxide concentration to 400g / L, put into the sand mill. Add the material and barium carbonate to the sand mill for wet mixing and grinding according to the molar ratio of titanium and barium 1:1, and grind in the sand mill for 1 hour. After the grinding is completed, put the material into the settling tank for sedimentation. The stirring speed is 10 rpm. After settl...

Embodiment 2

[0039] After beating and stirring 1 L of metatitanic acid solution that has been heated to 30°C for 30 minutes, the concentration is controlled at 400 g / L, the stirring speed is controlled at 30 rpm, and analytically pure ammonium bicarbonate is slowly added to the beating tank, and the reaction is until no Until obvious bubbles are produced, stop adding ammonium bicarbonate, continue to stir for 20 minutes, put the material into the washing storage tank, put it into the centrifuge for washing treatment, and after drying, put the material into the beating tank and continue to prepare with deionized water Titanium dioxide concentration to 600g / L, put into the sand mill. Add the material and barium carbonate to the sand mill according to the molar ratio of titanium to barium 1:1.3 for wet mixing and grinding, and grind in the sand mill for 3 hours. After the grinding is completed, put the material into the settling tank for sedimentation. The stirring speed is 20 rpm. After set...

Embodiment 3

[0041] After beating and stirring 1 L of metatitanic acid solution that has been heated to 25°C for 30 minutes, the concentration is controlled at 350 g / L, the stirring speed is controlled at 25 rpm, and analytically pure ammonium bicarbonate is slowly added to the beating tank, and the reaction is until no Stop adding ammonium bicarbonate until obvious bubbles are generated, continue to stir for 20 minutes, put the material into the washing storage tank, put it into the centrifuge for washing treatment, and after drying, put the material into the beating tank and continue to prepare with deionized water Titanium dioxide concentration to 500g / L, put into the sand mill. Add the material and barium carbonate to the sand mill according to the molar ratio of titanium to barium 1:1.2 for wet mixing and grinding, and grind in the sand mill for 2 hours. After grinding, put the material into the settling tank for sedimentation. The stirring speed is 15 rev / min. After settling for 10 ...

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Abstract

The invention belongs to the technical field of chemical synthesis and particularly relates to a method for preparing barium metatitanate by adopting a slurry fixation method. The method comprises the steps of desulfurizing metatitanic acid; carrying out solid-state doped wet ball-milling reaction on slurry; carrying out alkali cleaning hydroxylation; and drying and grinding to obtain barium metatitanate. The method is scientific, reasonable, easy to implement and low in production cost; the prepared barium metatitanate is kept in an ideal anatase structure; and a cubic phase is mainly adopted, so that appearance of other crystal phases is reduced, and an excellent barium metatitanate material for dielectric ceramics can be prepared.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for preparing barium metatitanate by a slurry fixation method. Background technique [0002] Barium metatitanate is a strong dielectric compound ferroelectric material with high dielectric constant, stable electrical constant, thermal variable parameters and low dielectric loss. It is one of the most widely used materials in electronic ceramics and is known as "The Pillar of the Electronic Ceramics Industry". It is mainly used in the preparation of various electronic components such as electronic ceramics, PTC thermistors, capacitors, and the reinforcement of some composite materials. Barium titanate is a consistent melting compound with a melting point of 1618°C. Below this temperature, BaTiO crystallizes above 1460°C 3 The barium titanate from the crystal structure belongs to the non-ferroelectric hexagonal system 6 / mmm point group. At this t...

Claims

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Application Information

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IPC IPC(8): C01G23/00
CPCC01G23/006C01P2006/12C01P2006/80
Inventor 李化全孙鹏
Owner SHANDONG DONGJIA GRP CO LTD
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