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Method for preparing strontium titanate powder

A technology of strontium titanate powder and titanium ions, which is applied in the field of preparing strontium titanate powder through chemical co-precipitation reaction, can solve the problem of high equipment investment and maintenance costs, increased waste gas collection and recovery, treatment equipment, and great harm to human body and environment and other problems, to achieve the effect of easy control of the reaction process, low equipment requirements, and good performance consistency

Active Publication Date: 2014-04-02
内蒙古科学技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strontium titanate powder prepared by the above method will produce ammonia and nitrogen-containing gases during the high-temperature calcination process, which is harmful to the human body and the environment. When used in industrial production, it is necessary to increase waste gas collection and recovery, treatment devices, equipment investment and maintenance. higher cost

Method used

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  • Method for preparing strontium titanate powder
  • Method for preparing strontium titanate powder
  • Method for preparing strontium titanate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Accurately weigh 43.82g of strontium chloride hexahydrate and dissolve it in 327ml of water, the solution is transparent. Coarsely configure 2mol / L titanium tetrachloride solution, after calibration, accurately pipette the titanium tetrachloride solution according to the strontium-titanium molar ratio of 1.01, and prepare a mixed solution with a total concentration of strontium and titanium ions of 0.5mol / L. use. In the reaction vessel, add 15% Na 2 CO 3 Solution 162ml and 2mol / L sodium hydroxide solution 250ml, as precipitant solution. Under the condition of sufficient stirring, the strontium and titanium mixed solution was added into the reaction vessel at a speed of 2.6 ml / min. During the feeding process, check the pH value of the system, and finally add 90 ml of sodium hydroxide solution, the pH value of the solution is 10.2, the feeding time is 4 hours, fully reacted for 1 hour, and aged for 1 hour. The lotion adopts a low-concentration sodium bicarbonate dilut...

Embodiment 2

[0045] According to the preparation method in Example 1, the only difference is that the molar ratio of strontium and titanium ions is 1.02, and the total concentration is 0.6mol / L. The mixed solution is calcined at 880° C. for 6 hours.

Embodiment 3

[0047] Strontium chloride is prepared by reacting strontium carbonate with hydrochloric acid. Accurately weigh 24.46 g of strontium carbonate, dissolve and clear it with about 100 ml of 30% (volume ratio) HCl, and add water to dilute to 320 ml. Coarsely configure 2mol / L titanium tetrachloride solution, after calibration, accurately pipette the titanium tetrachloride solution according to the strontium-titanium molar ratio of 1.01, and prepare a mixed solution with a total concentration of strontium and titanium ions of 0.52mol / L. use. In the reaction vessel, add 15% Na 2 CO 3 Solution 162ml and 2mol / L sodium hydroxide solution 250ml, as precipitant solution. Under the condition of sufficient stirring, the strontium and titanium mixed solution was added into the reaction vessel at a speed of 2.5 ml / min. During the feeding process, check the pH value of the system, and finally add 90 ml of sodium hydroxide solution, the pH value of the solution is 10.2, the feeding time is 4...

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Abstract

The invention provides a method for preparing strontium titanate powder. The method comprises the following steps in sequence: adopting a titanium tetrachloride solution and a strontium chloride solution as the raw materials, and a sodium carbonate solution and a sodium hydroxide solution as precipitators; carrying out liquid-phase chemical coprecipitation reaction on the raw materials and the precipitators, so as to obtain a precursor precipitate of the strontium titanate; separating the precipitate from the reaction solution system; washing; drying; and dynamically roasting at a high temperature in a rotating way, so as to obtain the strontium titanate powder. The method is environment-friendly, simple in technological process, and convenient for industrial production; and the prepared strontium titanate powder is stable in quality, and high in purity and uniformity.

Description

technical field [0001] The invention relates to a method for preparing strontium titanate powder, in particular to a method for preparing strontium titanate powder through chemical co-precipitation reaction. Background technique [0002] Titanate is widely used in electronic components and is known as "the pillar of the electronics industry". Strontium titanate (SrTiO3) powder is an electronic ceramic material widely used in the electronics industry. It has low dielectric loss, high dispersion frequency, good thermal stability, and excellent semiconductor performance. It is an excellent electronic ceramic. Material. With the further improvement of the miniaturization and integration of electronic devices, strontium titanate has gradually become a very attractive functional material, and its application prospects are very broad. People have also carried out extensive research on the preparation process of strontium titanate. [0003] At present, there are many methods for p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/626
Inventor 李林范永忠路红霞李武斌王梁
Owner 内蒙古科学技术研究院
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