Preparation method of barium carbonate and product prepared by same

Abstract

The invention relates to a preparation method of barium carbonate and a barium carbonate product prepared by the same. The preparation method of the barium carbonate comprises the following steps: (1) adding barium hydroxide octahydrate crystals into an ice water bath, and mixing, wherein the temperature is controlled at 0-5 DEG C; (2) introducing carbon dioxide into the mixture obtained in the step (1) to react until the pH value of the reaction solution is 6.0-7.0; and (3) carrying out solid-liquid separation on the solid-liquid mixture obtained in the step (2), and drying the solid to obtain the large-specific-area high-purity barium carbonate product. The preparation method provided by the invention solves the problem of incompatible low strontium and large specific area in the existing preparation method, so that the barium carbonate product is no longer influenced by the sintering temperature, thereby enhancing the performance of the ceramic material.

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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