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

A technology with large specific surface area and barium carbonate, applied in the field of materials, can solve the problems of slow reaction process, high cost of raw materials, equipment requirements and high production cost, and achieves the effect of simple operation process, mild reaction conditions and inhibition of agglomeration phenomenon.

Pending Publication Date: 2022-05-20
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
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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 c

Method used

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

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preparation example Construction

[0044] First aspect, the present invention provides a kind of preparation method of barium carbonate of large specific surface area, comprises the following steps:

[0045] Add barium salt solution and carbonate solution to the dispersant solution for reaction, and prepare barium carbonate with large specific surface area after heat preservation treatment;

[0046] The barium salt solution is added to the dispersant solution one step earlier than the carbonate solution;

[0047] The barium salt solution is also dissolved with a growth regulator;

[0048] The growth regulator includes at least one of ammonium polyacrylate, polyvinyl alcohol, polyethylene glycol, carboxymethyl cellulose, polyacrylamide or polycarboxylate ammonium salt obtained through alkalization;

[0049] The barium salt includes at least one of barium chloride, barium sulfate and barium hydroxide;

[0050] The carbonates include ammonium carbonate and / or sodium carbonate.

[0051]In some embodiments of the...

Embodiment 1-17 and comparative example 1-10

[0082] A kind of preparation method of barium carbonate of large specific surface area, comprises the steps:

[0083] (1) Preparation of the growth regulator used, code number K50, take 50g of ammonium polyacrylate, add 450ml of pure water and mix evenly, add 25ml of concentrated ammonia water with a mass concentration of 25% to carry out ammoniation treatment for 10min, and seal it for later use.

[0084] (2) Add the growth regulator K50 prepared in step (1) into 15 L of barium chloride solution with a molar concentration of 1.0 mol / L, set the stirring speed to 150 r / min, stir for 20 min, and set aside.

[0085] (3) Preparation of the base liquid, take 20 g of polyacrylamide as a dispersant, add 2 L of pure water, and stir at a speed of 100 r / min.

[0086] (4) Use a peristaltic pump to transport raw materials. During the process, add barium chloride dropwise while stirring the bottom liquid. After adding dropwise for 3 minutes, then add ammonium carbonate dropwise to control ...

Embodiment 18

[0093] A kind of preparation method of barium carbonate of large specific surface area, the difference with embodiment 9 is that growth regulator is different from the dispersant that adopts, and the preparation of growth regulator is as follows:

[0094] Take 50g of polyvinyl alcohol, add 450ml of pure water and mix evenly, add 25ml of concentrated ammonia water with a mass concentration of 25% to carry out ammoniation treatment for 10min, and seal it for later use.

[0095] The dispersant is sodium hexametaphosphate.

[0096] The specific surface area of ​​the prepared barium carbonate is 64.020m 2 / g, Cl content is 270ppm.

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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...

Claims

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Application Information

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IPC IPC(8): C01F11/18H01G4/12
CPCC01F11/188H01G4/1209C01P2006/12C01P2004/03Y02E60/10
Inventor 高艺玮张巧云杨爱民郭春意张莹魏利兵
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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