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Barium carbonate particle powder, production method thereof, and production method of perovskite barium titanate

A manufacturing method and technology of barium carbonate, applied in the direction of barium carbonate, calcium carbonate/strontium/barium, titanate, etc., can solve the problems of impurity mixing, purity, dispersibility, residue, etc., and achieve the suppression of impurity mixing and good dispersibility Effect

Active Publication Date: 2009-05-13
NIPPON CHECMICAL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Existing acicular barium carbonate has dispersibility problems due to its particle shape, and it is difficult to obtain a uniform mixture when mixed with other ceramic raw materials
As a result, for example, there is a problem that unreacted raw material barium carbonate and titanium dioxide remain in perovskite-type barium titanate obtained by mixing conventional acicular barium carbonate and titanium dioxide and calcining the mixture. Homogeneous mixture requires excessive pulverization treatment, therefore, it is easy to obtain products with low purity due to the mixing of impurities due to mixing and pulverization treatment

Method used

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  • Barium carbonate particle powder, production method thereof, and production method of perovskite barium titanate
  • Barium carbonate particle powder, production method thereof, and production method of perovskite barium titanate
  • Barium carbonate particle powder, production method thereof, and production method of perovskite barium titanate

Examples

Experimental program
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Effect test

Embodiment 1～5

[0119] 50.0 g of barium hydroxide octahydrate, 0.156 g of commercially available citric acid (100% in terms of purity), and 1,500 g of water were added to a reaction vessel to dissolve barium hydroxide and citric acid. Then, while stirring the reaction solution at 10,000 rpm, 0.0056 g of carbon dioxide was blown in at a flow rate of 0.0112 g / min to react, and needle-shaped barium carbonate was deposited. The reaction temperature at this time was 20° C., and the reaction time was 30 seconds.

[0120] Next, the 4% by weight slurry after the reaction was completed was put into an airtight container (autoclave), and heat-treated under stirring. The heat treatment temperature and time are shown in Table 1.

[0121] After heat treatment, the slurry was separated from solid and liquid by conventional methods, dried at 120° C. for 6 hours, and pulverized to obtain barium carbonate, which was used as a rod-shaped barium carbonate particle powder sample.

Embodiment 6～7

[0123] The reaction vessel is changed into an open vessel (flask) by a closed vessel (autoclave), and heat treatment is carried out according to the temperature and time shown in Table 1, except that, obtain rod-shaped barium carbonate under the same conditions as in Examples 1 to 5 Granular powder sample.

Embodiment 8

[0125] Precipitate needle-shaped barium carbonate in the same way as in Example 1, then in the process of heat treatment, the slurry is concentrated to 12% by weight and heat-treated, except that, the same operation as in Example 1 is performed to obtain rod-shaped barium carbonate particle powder sample.

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Abstract

A rod-like barium carbonate particle powder excellent in dispersibility and small in aspect ratio and a production method thereof are provided. The rod-like barium carbonate particle powder includes rod-like particles having one or two or more constricted portions on the particle surface and the aspect ratio of the rod-like particles is 1.5 to 4.5. The BET specific surface area of the rod-like particle is 15 m 2 / g or more. The constricted portions are disposed in the direction perpendicular to or inclined from the long axis direction of the rod-like particles. The production method of the rod-like barium carbonate particle powder includes a step of heat treating an aqueous slurry containing an acicular barium carbonate particle powder at 50 DEG C or higher. Also claimed are a method for producing perovskite barium titanate making use of the barium carbonate particle powder and a barium source comprising the barium carbonate powder.

Description

technical field [0001] The present invention relates to barium carbonate particle powder useful as a raw material for producing optical glass, electrical ceramics, etc., a method for producing the same, and a method for producing perovskite-type barium titanate using the barium carbonate particle powder. Background technique [0002] Barium carbonate is used as a raw material for producing barium titanate for ceramic capacitors, for tubes / optical glass, and as a pigment. In particular, multilayer capacitors are required to be smaller or thinner and higher in performance along with the miniaturization of electronic devices. Therefore, there is an increased demand for fine powdering of barium carbonate as a raw material. As a method for producing barium carbonate, methods such as the following reaction formulas (1), (2) and (3) have been proposed, for example. [0003] BaSO 4 +2C→BaS+2CO 2 ↑ [0004] BaS+CO 2 +H 2 O → BaCO 3 +H 2 S↑......(1) [0005] BaCl 2 +(NH 4 ...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01P2006/12C01P2004/10C01G23/006C01P2004/54C01F11/188C01P2004/03C01P2004/62C01F11/18
Inventor 菊地敦大高伸夫佐久间晃上本贤治
Owner NIPPON CHECMICAL IND CO LTD
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