Preparation method of barium carbonate and product prepared by same

Abstract

The present invention relates to a method for preparing barium carbonate and the barium carbonate product obtained by the method. The method for preparing barium carbonate comprises: (1) Adding barium hydroxide octahydrate crystal into the ice-water bath and mixing them, and controlling the temperature to be within 0ˆ¼5°C; (2) Introducing carbon dioxide into the mixture obtained from the step (1), till pH value of the reaction solution reaches 6.0-7.0; (3) Carrying out solid-liquid separation for the solid-liquid mixture obtained from the step (2), drying the obtained solid so as to obtain barium carbonate product. The present invention method solves the problem in the prior art that the character of low strontium and the character of large specific surface area cannot co-exist, which makes the property of barium carbonate product can not affect the sintering temperature, and thus the property material is improved.

Description

technical field [0001] The invention relates to a preparation method of barium carbonate and a barium carbonate product prepared therefrom. Background technique [0002] High-purity barium carbonate is mainly used for solid phase synthesis of electronic sensitive ceramic main crystal phase materials such as titanate, zirconate, stannate, etc. In recent years, with the development of the information and communication industry, the electronic component industry such as laminated capacitors, capacitor-inductor dual-function components, and the barium titanate supercapacitor industry have put forward higher requirements for the specific surface area of ​​high-purity barium carbonate. At the same time, more stringent attention has been paid to the strontium impurity content affecting the sintering temperature. [0003] The synthesis of barium carbonate with large specific surface area is generally carried out by liquid phase method, often adding grain growth inhibitors, or react...

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Problems solved by technology

[0003] The synthesis of barium carbonate with large specific surface area is generally carried out by liquid phase method, often adding grain growth inhibitors, or reacting in a rotating packed bed, or reacting in an alkoxide system, all of which have poor repeatability in the above reactions , the introduction of impurities has a great impact, and the washing is difficult, etc.

[0004] Strontium hydroxide and barium hydroxide are the main materials for preparing strontium carbonate and barium carbonate with large specific surface area. 2 / g above SrCO 3 is easy, since Sr 2+ The role of the corresponding higher strontium-containing Ba(OH) 2 ·8H 2 O to prepare BaCO with large specific surface area 3 It is relatively easy, but the method for preparing high-purity barium carbonate with low strontium and large specific surface area has not been studied

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