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Preparation method of calcium carbonate particles

A calcium carbonate and particle technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of uneven morphology of calcium carbonate particles, and achieve the effects of uniform morphology, prevention of crystal structure damage, and simple preparation method.

Active Publication Date: 2017-04-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0007] In order to overcome the technical problem of uneven morphology of existing calcium carbonate particles, the invention provides a method for preparing calcium carbonate particles with relatively uniform morphology

Method used

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  • Preparation method of calcium carbonate particles
  • Preparation method of calcium carbonate particles
  • Preparation method of calcium carbonate particles

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preparation example Construction

[0029] See figure 1 , The present invention provides a method for preparing calcium carbonate particles, including the steps:

[0030] Step S1: Provide the required Ca 2+ Donor's solution and containing CO 3 2- Donor’s solution, the Ca 2+ Donor and CO 3 2- The donor is a soluble salt;

[0031] Step S2: Combine the Ca-containing 2+ Donor's solution and containing CO 3 2- The solution of the donor is first mixed and stirred at a high speed stage and then continues to be stirred at a low speed stage to obtain a calcium carbonate suspension to obtain calcium carbonate particles. The stirring speed at the high speed stage is 300-1200r / min, and the stirring time is 10s- 80s; the stirring speed in the low-speed stage is 50-200r / min, and the stirring time is 0.5-30min.

[0032] In the embodiment of the present invention, in step S1, the required Ca-containing 2+ Donor's solution and containing CO 3 2- In the donor solution method, the Ca provided 2+ Donor and CO 3 2- The molar concentration ...

no. 1 Embodiment

[0051] Weigh 3.66g of calcium chloride, that is, 0.33M calcium chloride, add the calcium chloride to deionized water, and stir at 28°C for 3min to obtain a calcium chloride solution; weigh 3.50g of sodium carbonate, which is 0.33 M sodium carbonate, add the sodium carbonate to 100 mL of deionized water, and stir for 3 min at a temperature of 28° C. to obtain a sodium carbonate solution.

[0052] The calcium chloride solution and calcium carbonate solution obtained above were mixed and stirred at a high-speed stage at a temperature of 28°C. The stirring speed of the high-speed stage was 650r / min and the time was 30s; after the high-speed stage was mixed and stirred, it was lowered The speed continues to undergo low-speed stage stirring. The low-speed stage stirring speed is 100r / min and the time is 2min. After the low-speed stage stirring is completed, a calcium carbonate suspension is obtained;

[0053] After centrifugally washing the calcium carbonate suspension with deionized wat...

no. 2 Embodiment

[0059] The difference between the second specific embodiment and the first specific embodiment is: the stirring speed in the high-speed stage is 600r / min, and the time is 30s; after the high-speed stage is mixed and stirred, the low-speed stage is continued. The stage stirring speed is 50r / min, and the time is 2min.

[0060] Through the same test method as the above-mentioned first embodiment, the calcium carbonate particles obtained in the second embodiment have a relatively uniform morphology, and 98% of the calcium carbonate particles have a hexahedral structure. See Figure 5 When the calcium carbonate particles obtained in the second specific embodiment are enlarged 20000 times, it can be clearly observed that a single calcium carbonate particle has a regular regular hexahedral structure and is well dispersed. The side length of the regular hexahedron is 2.5-7.2um. .

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Abstract

The invention relates to the field of preparation of inorganic nonmetallic materials, in particular to a preparation method of calcium carbonate particles. The preparation method of the calcium carbonate particles comprises steps as follows: a solution containing Ca<2+> donors and a solution containing CO3<2-> donors in need are provided, and the Ca<2+> donors and the CO3<2-> donors are soluble salts; the solution containing the Ca<2+> donors and the solution containing the CO3<2-> donors are firstly mixed at a high speed and stirred and then are continuously stirred at a low speed, a calcium carbonate suspension is obtained, and the calcium carbonate particles are obtained accordingly, wherein the stirring speed at the high-speed stage is 300-1200 r / min, and the stirring time is 10-80 s; the stirring speed at the low-speed stage is 50-200 r / min, and the stirring time is 0.5-30 min. The preparation method of the calcium carbonate particles is simple, and the calcium carbonate particles with uniform morphology can be obtained.

Description

[0001] 【Technical Field】 [0002] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a preparation method of calcium carbonate particles. [0003] 【Background technique】 [0004] Since the morphology of a substance has a great influence on its physical and chemical properties, the preparation of particles with special morphology and controllable size has become a hotspot and difficulty in the research of new inorganic materials in recent years. Calcium carbonate is an important inorganic filler and a typical biological mineral. It has the advantages of low cost, non-toxicity, and non-irritating. As an additive and reinforcing agent, it is widely used in rubber, plastics, papermaking, ink, building materials and medicine, etc. In industry, by preparing calcium carbonate with special morphology, it can be given higher application performance and added value. [0005] At present, using carbonization method, solution precipitation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2002/72C01P2004/03
Inventor 伍芳胡琮瑾吴露向勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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