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method for preparation of Sr titanate powder

A technology of strontium titanate powder and solution, which is applied in the direction of titanate, alkaline earth metal titanate, chemical instruments and methods, etc., and can solve the problems of powder quality difference, etc.

Inactive Publication Date: 2004-03-31
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the above methods are mostly discontinuous methods, there are differences in powder quality between batches

Method used

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  • method for preparation of Sr titanate powder
  • method for preparation of Sr titanate powder
  • method for preparation of Sr titanate powder

Examples

Experimental program
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Embodiment 1

[0043] Prepare a NaOH solution with a concentration of 6.0 mol / L, wherein NaOH uses an analytically pure reagent. A NaOH solution with a concentration of 6 mol / l is placed in a stainless steel NaOH storage tank 1 . while SrCl 2 and TiCl 4 The preparation of the mixed solution adopts the following steps: respectively prepare 2.0mol / L concentration of SrCl 2 and 2.0mol / L concentration of TiCl 4 solution. Prepare [SrCl by adding deionized water 2 ]+[TiCl 4 ] The total concentration of the mixed solution is 1mol / L, while [SrCl 2 ] / [TiCl 4 ] is 1.05. The above prepared SrCl 2 and TiCl 4 The mixed solution is placed in storage tank 6.

[0044] After starting the hypergravity reactor, the total concentration of 1mol / L SrCl 2 and TiCl 4 The mixed solution is pumped out from the storage tank 6 through the pump 7, and after being measured by the flowmeter 5, enters the rotary bed 3 from the rotary bed liquid inlet 4, and its flow rate is set at 40 L / hr. The NaOH solution w...

Embodiment 2

[0049] Adopt the preparation method as described in embodiment 1, the NaOH aqueous solution that preparation concentration is 6.0mol / L, [SrCl 2 ]+[TiCl 4 ] The total concentration of the mixed solution is 1.0mol / L and [SrCl 2 ] / [TiCl 4 ] is 1.05 containing Ba 2+ and Ti 4+ of aqueous solution.

[0050] After starting the high gravity reactor, adopt the mode as embodiment 1 with SrCl 2 and TiCl 4 The mixed solution is pumped out from the storage tank 6 through the pump 7, and after being metered by the flowmeter 5, enters the rotary bed 3 at 80 L / hr from the rotary bed liquid inlet 4. Adjust the flow rate of the NaOH solution with a concentration of 6.0 mol / L into the rotary bed 3 to vary within the range of 40 L / hr to 90 L / hr. After entering the supergravity reactor, controlled at a reaction temperature of about 85°C, SrCl 2 and TiCl 4 The mixed solution and the NaOH solution fully contact and react in the packing layer of the rotary bed 3. During the reaction, the rota...

Embodiment 3

[0054] Adopt the method as embodiment 1, preparation concentration is the KOH aqueous solution of 8.0mol / L, [SrCl 2 ]+[TiCl 4 ] with a total concentration of 2mol / L and [SrCl 2 ] / [TiCl 4 ] is an aqueous solution of 1.05.

[0055] According to the steps described in Example 1, the reaction was carried out in a high-gravity reactor at a temperature of 70° C. to obtain a slurry containing strontium titanate powder.

[0056] The slurry obtained after the reaction is stirred and aged in a stirred tank for 3-20 minutes. Then the aged suspension was filtered and washed three times with deionized water at about 95 °C, and dried in a desiccator to obtain SrTiO 3 Powder.

[0057] The analysis results show that the characteristics of the product obtained in this example are the same as those of the strontium titanate powder obtained in Example 1.

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Abstract

A method of preparing strontium titanate powder comprises, a Ti4+solution, a Sr2+ Solution and an aqueous alkali, or a mixture containing Ti4+ and Sr2+ and an aqueous alkali are reacted in a G-force reactor at about 60degree C -100degree C. Strontium titanate powder of the invention has a small mean particle size with an uniform diameter, and is suitable for the raw material of dielectric, piezoelectric, sensitive ceramics and others. The method of preparing strontium titanate powder in a G-force reactor could produce continuously strontium titanate powder.

Description

field of invention [0001] The invention relates to a method for preparing strontium titanate powder. Specifically, the present invention relates to a method for preparing strontium titanate powder in a high gravity reactor. More specifically, the present invention relates to a method for continuously preparing strontium titanate using a hypergravity reactor. According to the method of the present invention, the ultrafine strontium titanate powder with the required particle size range can be controlled and obtained. Background technique [0002] ABOs 3 Type perovskite composite oxides are an important class of inorganic compounds, which can be used as many functional materials. Among these compounds, strontium titanate (SrTiO 3 ) ceramic is an emerging multifunctional electronic ceramic material, and BaTiO 3 Compared with other materials, it not only has good dielectric properties, but also has excellent semiconductivity, better temperature stability, and high withstand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
CPCC01G23/006C01P2002/34C01P2002/72C01P2004/32C01P2002/76C01P2004/64B82Y30/00C01P2004/04C01P2004/52C01P2004/62
Inventor 陈建峰沈志刚刘晓林
Owner BEIJING UNIV OF CHEM TECH
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