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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

Active Publication Date: 2021-07-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation method can produce porous light calcium carbonate whose properties such as whiteness and BET have been improved, the product purity of porous light calcium carbonate is low, and the particle size distribution of the product is uneven
[0006] CN106395878A discloses a method for preparing calcium carbonate filler for papermaking from wood pulp lime mud and calcium carbonate filler thereof. The preparation method includes lime classification, green liquor purification , green liquor filtration, white liquor causticization, lime mud slag removal, white liquor washing and concentration, pH value adjustment, leveling treatment, although the preparation method can refine the pollutant white mud into calcium carbonate as a filler for papermaking, to prevent It avoids secondary pollution and reduces the cost of paper production, but the process is complicated, and the purity of the calcium carbonate product is low, and the particle size distribution of the product is uneven
Although the preparation method is short in technological process and simple in operation, it cannot effectively control the particle size distribution of the calcium carbonate product.
[0008] In summary, although the prior art discloses some preparation methods of calcium carbonate, it is impossible to prepare calcium carbonate with high purity, large and uniform particle size, and good crystallization performance. Large particle calcium carbonate

Method used

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  • Calcium carbonate and preparation method thereof
  • Calcium carbonate and preparation method thereof
  • Calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The present embodiment provides a kind of preparation method of calcium carbonate, adopts industrial lime as calcium-containing raw material, and its chemical composition is as shown in table 1:

[0058] Table 1

[0059]

[0060] Described preparation method comprises the steps:

[0061] (1) Mix industrial lime with hydrochloric acid solution, carry out the decomposition reaction at 20 DEG C for 3 hours, and the calcium chloride-containing feed liquid after the reaction undergoes liquid-solid separation to obtain calcium chloride-containing solution and insoluble slag;

[0062] Wherein, the ratio of HCl to the amount of CaO in industrial lime is 1.6:1; the washing water obtained by washing the insoluble slag is mixed with the calcium chloride-containing solution;

[0063] (2) gradually add calcium chloride solution described in step (1) in the carbonization reactor of prestored water, and feed carbon dioxide gas to carry out carbonization reaction simultaneously, co...

Embodiment 2

[0066] This embodiment provides a method for preparing calcium carbonate, using calcium carbide slag in a place in Henan as a calcium-containing raw material, and the preparation method includes the following steps:

[0067] (1) Mix calcium carbide slag with ammonium chloride solution, and carry out a decomposition reaction at 100°C for 0.05h. After the reaction, the calcium chloride-containing feed liquid undergoes liquid-solid separation to obtain calcium chloride-containing solution and insoluble slag;

[0068] Among them, the NH 4 The ratio of Cl to the amount of CaO in the calcium carbide slag is 2.4:1; the washing water obtained by washing the insoluble slag is mixed with the calcium chloride-containing solution;

[0069] (2) Gradually add the calcium chloride solution described in step (1) into the carbonization reactor of the carbonization mother liquor described in pre-stored embodiment 1, and feed carbon dioxide gas to carry out carbonization reaction at the same tim...

Embodiment 3

[0072] The present embodiment provides a kind of preparation method of calcium carbonate, adopts industrial lime described in embodiment 1 as calcium-containing raw material, and described preparation method comprises the steps:

[0073] (1) Industrial lime is mixed with ammonium nitrate solution, and a decomposition reaction is carried out at 50° C. for 1 hour. After the reaction, the calcium nitrate-containing feed liquid is subjected to liquid-solid separation to obtain calcium nitrate-containing solution and insoluble slag;

[0074] Among them, the NH 4 NO 3 The ratio to the amount of CaO in industrial lime is 2.0:1; the washing water obtained by washing the insoluble slag is mixed with the calcium chloride-containing solution;

[0075] (2) In the carbonization reactor of the carbonization mother liquor described in pre-stored embodiment 2, gradually add the calcium nitrate solution described in step (1), and simultaneously feed carbon dioxide gas to carry out carbonizati...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2006/80C01P2002/72C01P2004/03C01P2004/61C01P2004/32
Inventor 曹绍涛张毅张芳芳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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