Large-specific-surface-area barium carbonate as well as preparation method and application thereof

Abstract

The invention provides large-specific-surface-area barium carbonate as well as a preparation method and application thereof, and relates to the technical field of materials. The preparation method of the large-specific-surface-area barium carbonate provided by the invention comprises the following steps: adding a barium salt solution and a carbonate solution into a dispersing agent solution for reaction, and carrying out heat preservation treatment to prepare the large-specific-surface-area barium carbonate. Wherein a specific growth regulator is dissolved in the barium salt solution, so that the agglomeration phenomenon can be effectively inhibited; the barium salt solution is added into the dispersing agent solution in one step compared with the carbonate solution, so that the Ostwald ripening phenomenon and the re-agglomeration phenomenon of generated barium carbonate are avoided; barium chloride which is cheaper than barium hydroxide is used as a raw material, so that the raw material cost is greatly saved. The preparation method is simple in operation process and mild in reaction condition, industrial production can be achieved, the specific surface area of the prepared barium carbonate can reach 50 m < 2 > / g or above, and the requirement of the market for large-specific-surface-area barium carbonate can be met.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to barium carbonate with a large specific surface area and its preparation method and application. Background technique [0002] As one of the important chemical raw materials, barium carbonate is widely used in magnetic materials, optical glass, ceramics, coatings, ferrite and other fields. Among them, in the field of electronic materials, barium carbonate is one of the most important raw materials for preparing dielectric materials in multilayer ceramic capacitors (MLCC). At present, electronic products are developing toward the trend of miniaturization, ultra-thinning, and portability, and the corresponding MLCC is also developing toward miniaturization and thinning. Barium becomes a trend. [0003] The prior art discloses a process in which barium hydroxide is used as a barium source and carbon dioxide is used as a carbon source to react in an ammonia water system to generat...

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Problems solved by technology

However, the cost of raw materials for production is high, and the ammonia gas produced will bring environmental protection pressure. At the same time, the reaction requires a closed environment, and the requirements for the sealing and pressure resistance of the equipment are relatively high, and the gas-liquid reaction system is destined to be slow in the reaction process. The pressure of mass production is relatively high

There are also technologies that disclose the synthesis of barium carbonate with a large specific surface under the assistance of ultrasound in a low temperature environment. However, the effect of ultrasonic dispersion is limited, and the specific surface can only be achieved to 10m 2 / g or so, the specific surface area cannot exceed 50m 2 / g

[0004] CN106186023B discloses a reaction system in which low-temperature barium chloride is uniformly added drop-wise to low-temperature sodium carbonate at 2-5°C and accompanied by ultrasonic-assisted reaction system to prepare barium carbonate with a large specific surface, and the low temperature can suppress the generated carbonic acid The agglomeration of barium, plus ultrasonic dispersion, greatly reduces the specific surface area of ​​barium carbonate, but the low-temperature manufacturing process requires high equipment requirements and high production costs, which is not suitable for industrial production

Although there are no by-products in the process of producing barium carbonate and the product is of high purity, CO is involved in the reaction process 2 The use of gas requires high airtightness of the equipment, and the miniature reaction device mentioned in the article also greatly increases the production cost, and the cost of the raw material barium hydroxide is also relatively high, so it is difficult to achieve industrial promotion.

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