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Generally spherical barium carbonate particles, and method for producing generally spherical barium carbonate particles

一种制造方法、碳酸钡的技术，应用在碳酸钡、碳酸钙/锶/钡、纤维状填料等方向，能够解决粉碎需要很长时间等问题，达到均匀性高的效果

Active Publication Date: 2012-03-07
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain fine particles with a small aspect ratio, it is necessary to pulverize with sufficient pulverization strength, and pulverization takes a long time

Method used

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  • Generally spherical barium carbonate particles, and method for producing generally spherical barium carbonate particles
  • Generally spherical barium carbonate particles, and method for producing generally spherical barium carbonate particles
  • Generally spherical barium carbonate particles, and method for producing generally spherical barium carbonate particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Barium hydroxide octahydrate was dissolved in pure water, and then 50% gluconic acid solution (manufactured by Fuso Chemical Industry Co., Ltd. ). Next, it was diluted with pure water so that the final concentration of barium hydroxide octahydrate was 120 g / L to prepare a barium hydroxide-gluconic acid aqueous solution (raw material A). The liquid temperature at this time was adjusted to 50°C. exist figure 1 In the shown reaction device, the raw material A is sent into the reaction vessel at a flow rate of 300ml / min. Simultaneously, carbon dioxide gas was also fed into the reaction container at 9 L / min, and the reaction was carried out by high-speed stirring using an IKA homogenizer (manufactured by IKA WORKS.INK, ULTRA-TURRAX T25 basic). At this time, the pH of the slurry at the outlet of the reaction vessel was 10-11. The reaction was carried out for 1 minute, and an aqueous solution of citric acid monohydrate having a concentration of 15 g / L was added to the resu...

Embodiment 2

[0119] Scale-up based on the results of Example 1. Such as Figure 15 As shown, the reaction device uses a device in which pumps P1, P2 and P3 are connected in three stages. The details of each pump are as follows. In addition, 1 inch = about 2.54 cm.

[0120] (a) Pump P1 of the first stage: Centrifugal pump (manufactured by RASA Shoji Co., Ltd.), suction port diameter 1.5 inches, discharge port diameter 1 inch, discharge volume 170 L / min, impeller rotation speed 2080 rpm

[0121] (b) Pump P2 of the second stage: Centrifugal pump (manufactured by RASA Shoji Co., Ltd.), suction port diameter 1 inch, discharge port diameter 3 / 4 inch, discharge volume 30 L / min, impeller rotation speed 1420 rpm

[0122] (c) Pump P3 of the third stage: Centrifugal pump (manufactured by Pacific Metal Co., Ltd.), suction port diameter 1 inch, discharge port diameter 3 / 4 inch, 30 L / min, impeller rotation speed 1420 rpm

[0123] 48 kg of barium hydroxide octahydrate was dissolved in pure water, 50 ...

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Abstract

The present invention has an object to provide a method for producing particulate barium carbonate having desired properties such as high purity, fineness, and has a spherical shape. The present invention relates to a method of producing substantially spherical barium carbonate, including (A) mixing, in an aqueous medium, a barium compound with at least one first ingredient selected from the group consisting of gluconic acid or salts thereof, gluconolactone, glucoheptonic acid or salts thereof, and glucoheptonolactone, to prepare a mixture; and (B) reacting the barium compound with carbon dioxide or a water-soluble carbonate in the mixture, to produce substantially spherical barium carbonate.

Description

technical field [0001] The present invention relates to a method for producing near-spherical barium carbonate and fine near-spherical barium carbonate, and a composition of near-spherical barium carbonate. The near-spherical barium carbonate is mainly suitable for use as raw materials for electronic materials and phosphors. Background technique [0002] Barium carbonate is a main raw material of barium titanate which is an electronic material. In recent years, along with miniaturization and higher performance of electronic equipment, multilayer ceramic capacitors are also developing toward higher capacity and higher performance. Along with this, barium titanate as a raw material is required to be highly purified and miniaturized. [0003] Generally, barium titanate is produced by wet mixing barium carbonate and titanium oxide, drying and sintering. In order to obtain high-quality barium titanate, it is desirable to mix uniformly and sinter with high uniformity during wet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/188C01P2004/03C01P2004/32C01P2004/34C01P2004/54C01P2006/12C09C1/02Y10T428/2982C01F1/00C01F11/18
Inventor 志水勇介泉川博幸
Owner SAKAI CHEM IND CO LTD
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