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Preparation method of large-particle calcium carbonate

A technology of calcium carbonate and large particles, which is applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., which can solve the problems of inability to prepare large particles of calcium carbonate and meet the requirements of large particles , achieve the effect of saving procurement cost and low cost

Active Publication Date: 2020-11-03
浙江省建德市正发药业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the single crystal particles of light calcium carbonate produced by the conventional carbonization method are generally between 50 nanometers and 5 microns, which cannot meet the requirements of large particles
[0004] Therefore, the existing carbonization method for preparing light calcium carbonate has the problem of being unable to prepare large particle calcium carbonate

Method used

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  • Preparation method of large-particle calcium carbonate

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Effect test

Embodiment 1

[0036] Example 1. The preparation method of large particle calcium carbonate, such as figure 1 Shown, comprise the following steps: A, prepare calcium hydroxide slurry;

[0037] B. Initial carbonization;

[0038] C, secondary carbonization;

[0039] D. Repeat secondary carbonization: Repeat step C until the material level in the carbonization tank reaches 100%;

[0040] E. Slurry thickening: Take a certain amount of slurry from the carbonization tank to the thickening tank, make it thicker and drain the dilute phase part containing crystal nuclei, and return the remaining dense phase part in the thickening tank to carbonization in the tank;

[0041] F. Tertiary carbonization: Add the calcium hydroxide slurry into the carbonization tank to restore the material level in the carbonization tank to 100%, feed carbon dioxide gas and stir to reduce the pH value of the material in the carbonization tank to 7-8;

[0042] G, prepare finished calcium carbonate slurry;

[0043] H, d...

Embodiment 2

[0059] Example 2. The preparation method of large particle calcium carbonate, such as figure 1 Shown, comprise the following steps: A, prepare calcium hydroxide slurry;

[0060] B. Initial carbonization;

[0061] C, secondary carbonization;

[0062] D. Repeat secondary carbonization: Repeat step C until the material level in the carbonization tank reaches 100%;

[0063] E. Slurry thickening: Take a certain amount of slurry from the carbonization tank to the thickening tank, make it thicker and drain the dilute phase part containing crystal nuclei, and return the remaining dense phase part in the thickening tank to carbonization in the tank;

[0064] F. Tertiary carbonization: add the calcium hydroxide slurry into the carbonization tank, make the material level in the carbonization tank return to 100%, feed carbon dioxide gas and stir, and make the pH value of the material in the carbonization tank drop to 7;

[0065] G, prepare finished calcium carbonate slurry;

[0066]...

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Abstract

The invention discloses a preparation method of large-particle calcium carbonate. The method comprises the following steps: preparing calcium hydroxide slurry, carrying out primary carbonization, carrying out secondary carbonization, repeating the secondary carbonization, thickening the slurry, carrying out tertiary carbonization, preparing finished calcium carbonate slurry, carrying out centrifugal dehydration, drying the mixture, and performing de-aggregation and pulverization. According to the method, calcium hydroxide raw pulp is fully and completely prepared into primary calcium carbonateslurry in a repeated secondary carbonization mode, then the concentration of the slurry is increased in a partial slurry thickening mode, so that crystal nucleuses are separated out, and the slurry with the crystal nucleuses separated out is fed back to a carbonization tank to be further carbonized; therefore, the particle size of the finally prepared calcium carbonate powder can reach more than30 microns, and the requirements of related fields on large-particle calcium carbonate are met. The method has the advantage in preparation of the large-particle calcium carbonate.

Description

technical field [0001] The invention relates to the field of calcium carbonate preparation, in particular to a method for preparing large particle calcium carbonate. Background technique [0002] Light calcium carbonate powder is widely used in the industrial field, but in some fields such as the pharmaceutical field, in order to control the specific surface area of ​​the calcium carbonate split and reduce its water absorption, so as to meet the special requirements of some preparations, it is necessary to use Large particle calcium carbonate powder. [0003] However, the single crystal particles of light calcium carbonate produced by the conventional carbonization method are generally between 50 nanometers and 5 microns, which cannot meet the requirements of large particles. [0004] Therefore, the existing carbonization method for preparing light calcium carbonate has the problem of being unable to prepare large particle calcium carbonate. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/181C01F11/185C01P2004/61Y02P20/141
Inventor 颜培刚
Owner 浙江省建德市正发药业有限公司
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