Calcium carbonate and preparation method thereof

A technology for calcium carbonate and calcium raw materials, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of inability to effectively control the particle size distribution of calcium carbonate products, low purity of porous light calcium carbonate products, uneven product particle size distribution, etc. Good liquid-solid separation performance, strong industrial operability, and the effect of realizing the concept of environmental protection
CN113120935AActive Publication Date: 2021-07-16INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2021-07-16

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Abstract

The invention relates to calcium carbonate and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing a calcium-containing raw material with a dissolution medium, carrying out a decomposition reaction, and carrying out liquid-solid separation on the calcium-containing material liquid after the reaction to obtain a calcium-containing solution and insoluble slag; and (2) contacting the calcium-containing solution obtained in the step (1) with a gas containing carbon dioxide, carrying out a carbonization reaction, and carrying out liquid-solid separation on a carbonized material liquid obtained after the reaction to obtain calcium carbonate and a carbonized mother solution. The preparation method not only can realize controllable morphology, controllable granularity and controllable purity of artificially synthesized calcium carbonate, but also can realize efficient circulation of a medium. The purity of the calcium carbonate obtained by the preparation method is higher than 99%, the morphology is regular, and the granularity is uniform and adjustable.
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Description

technical field

[0001] The invention relates to the field of chemical products or material preparation, in particular to calcium carbonate and a preparation method thereof. Background technique

[0002] As a high-quality filler and white pigment, calcium carbonate is widely used in industries such as plastics, papermaking, rubber, coatings and inks, and can also be used in industries such as pharmaceuticals, biological fermentation, daily chemicals, and food and feed additives.

[0003] According to different production methods, calcium carbonate is divided into heavy calcium carbonate, light calcium carbonate (also called precipitated calcium carbonate) and modified calcium carbonate. For example, using mollusk fossils or limestone as raw materials, prepare heavy calcium carbonate with a particle size of less than 28 microns or less than 2 microns by dry grinding or wet grinding; Light calcium carbonate: calcium carbonate powder is used as raw material, and modified calciu...

Claims

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