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A kind of preparation method of superfine ground calcium carbonate

A technology of heavy calcium carbonate and fine powder, which is applied in chemical instruments and methods, fibrous fillers, and dyed low-molecular organic compound treatment, etc. It can solve the problem of reducing the protective effect, poor calcium carbonate coating effect, Problems such as unreasonable composite particles achieve the effect of reducing time and good fineness

Active Publication Date: 2021-12-24
ZHUHAI JINJI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation method, the preparation environment is the commonly used alkaline environment for the preparation of silicon dioxide. The alkaline environment is very conducive to the formation of silicon dioxide. Silica particles, not only have a poor coating effect on calcium carbonate, but the formed silica particles are also easy to become impurities in calcium carbonate particles
And in the coating process, the silica that has been successfully coated is also easily dissolved by the alkaline solution in an alkaline environment to form silicon salt and water, which further reduces the protective effect.
And the application does not involve the grinding process, so it seems unreasonable to obtain ultrafine calcium carbonate composite particles with a fineness of 0.03-2 μm

Method used

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preparation example Construction

[0025] In order to solve the above problems, the invention provides a kind of preparation method of superfine heavy calcium carbonate, comprising the following steps: (1) adding heavy calcium carbonate coarse powder into grinding equipment and grinding into fine powder until the average particle diameter reaches 2~ 3 microns, and the heavy calcium carbonate fine powder after grinding is added into water to make slurry, and limit the solid content of heavy calcium carbonate fine powder in the slurry; (2) silicon dioxide preparation and silane auxiliary agent are carried out Mixing and stirring, adding the pulped slurry, stirring evenly; (3) adding grinding aids to the slurry obtained in step (2), and performing wet ultrafine grinding; naturally cooling to room temperature after grinding, After completion, add 3 to 4 times the volume of water to the slurry after wet ultrafine grinding; (4) add sodium bicarbonate to the diluted slurry and stir evenly, and settle for 20 to 24 hours...

Embodiment 1

[0042] Embodiment 1 provides a kind of preparation method (in parts by weight) of superfine calcium carbonate: (1) 20 parts of heavy calcium carbonate coarse powders are added in grinding equipment and ground into fine powder until the average particle diameter reaches 2 microns , and the ground fine powder is added to water slurry until the solid content of heavy calcium carbonate coarse powder is 75%; (2) 10 parts of tetraethyl orthosilicate, 16 parts of phenol, 30 parts of ethanol, 5 parts of benzene Mix and stir methyl silicone oil and 3 parts of trimethylethoxysilane (CAS: 1825-62-3), add the slurry after pulping, and stir evenly; (3) add 3 parts of sodium carbonate to step (2) in the obtained slurry, and the slurry is subjected to wet ultrafine grinding for 2 hours; after grinding, it is naturally cooled to room temperature, and after completion, the slurry after wet ultrafine grinding is diluted with 3 times the volume of water; (4) Add 15 parts of sodium bicarbonate to...

Embodiment 2

[0047] The specific implementation method of this embodiment is the same as that of embodiment 1, except that: tetraethyl orthosilicate is 8 parts.

[0048] The superfine ground calcium carbonate prepared in this embodiment is denoted as C2.

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Abstract

The invention discloses a preparation method of superfine heavy calcium carbonate, which mainly includes the steps of: (1) pre-grinding heavy calcium carbonate coarse powder to 2-3 microns and making slurry; (2) preparing silicon dioxide preparation Mix and stir with silane additives, add slurry; (3) perform wet grinding, and add deionized water to dilute the ground powder; (4) add sodium bicarbonate to the diluted slurry and stir evenly, and carry out Settled for 20 to 24 hours, and then separated the supernatant; (5) dried to obtain. The prepared ground calcium carbonate powder has excellent particle size, acid resistance, and excellent grinding efficiency. It is suitable for popularization in the field of calcium carbonate preparation and has broad development prospects.

Description

technical field [0001] The invention relates to the field of calcium carbonate preparation, in particular to a preparation method of superfine ground calcium carbonate. Background technique [0002] Calcium carbonate has the characteristics of easy source of raw materials, low price, low toxicity, high whiteness, large filling capacity and good mixing and processing performance. It is widely used in rubber, paint, papermaking, plastics and other industries. It is an important inorganic filler. Ultrafine calcium carbonate is a very important functional inorganic material, which is widely used in industrial fields such as rubber, plastics, coatings and papermaking. It is usually used as a filler to increase the volume of products, but in some special fields Among them, such as in the field of fire-fighting dry powder, superfine calcium carbonate usually uses its good adsorption to play the role of smoke adsorbent. The finer the powder particle size of calcium carbonate produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08C09C3/12
CPCC09C1/024C09C1/022C09C3/006C09C3/041C09C3/06C09C3/063C09C3/08C09C3/12
Inventor 余军生蔡杨勇周建新
Owner ZHUHAI JINJI CHEM
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