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Method for preparing cubic precipitated calcium carbonate

A technology of precipitated calcium carbonate and cubic shape, applied in the field of calcium carbonate, which can solve problems such as difficult quality control, complicated preparation process, and increased cost, and achieve the effects of good quality control, simple process, and control of production costs

Pending Publication Date: 2019-12-10
上海碳酸钙厂有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there have been many studies on the preparation of cubic precipitated calcium carbonate, but most of them use precipitation aids to control the morphology, which not only increases the cost, but also makes the preparation process more complicated and difficult to carry out quality control.

Method used

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  • Method for preparing cubic precipitated calcium carbonate
  • Method for preparing cubic precipitated calcium carbonate
  • Method for preparing cubic precipitated calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Add 2500 grams of quicklime to 40 liters of water at 48°C and stir for 30 minutes to make a calcium hydroxide slurry, and then pass it through a 200-mesh sieve for later use; the concentration of the obtained calcium hydroxide slurry is 61.3 g / L;

[0024] (2) Add the above-mentioned 30 liters of calcium hydroxide slurry into a jacketed reaction vessel equipped with a dispersing paddle; open the dispersing paddle (linear velocity 5.6 m / s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry is cooled to 11.3°C, and then filled with carbon dioxide at a rate of 29.4 liters / minute; simultaneously, the temperature of the slurry in the reaction vessel is controlled at 10-25°C until the pH value of the slurry in the reaction vessel reaches 6.2; the reaction is completed and obtained Aqueous slurry of cubic precipitated calcium carbonate, products such as figure 1 shown.

[0025] Depend on figure 1 It can be seen tha...

Embodiment 2

[0027] (1) Add 1900 grams of quicklime to 30 liters of water at 48°C and stir for 30 minutes to make a calcium hydroxide slurry, and then pass it through a 200-mesh sieve for later use; the concentration of the obtained calcium hydroxide slurry is 52.9 grams per liter;

[0028] (2) Add the above-mentioned 28 liters of calcium hydroxide slurry into a jacketed reaction vessel equipped with a dispersing paddle; open the dispersing paddle (linear velocity 5.6 m / s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry is cooled to 15.2°C, and then filled with carbon dioxide at a rate of 23.7 liters / minute; simultaneously, the temperature of the slurry in the reaction vessel is controlled at 14-22°C until the pH value of the slurry in the reaction vessel reaches 6.2; the reaction is completed and obtained Aqueous slurry of cubic precipitated calcium carbonate, products such as figure 2 shown.

[0029] Depend on figure 2 It c...

Embodiment 3

[0031] (1) Add 2506 grams of quicklime to 30 liters of water at 43°C and stir for 30 minutes to make a calcium hydroxide slurry, and then pass it through a 200-mesh sieve for later use; the concentration of the obtained calcium hydroxide slurry is 59.2 grams per liter;

[0032] (2) Add the above-mentioned 28 liters of calcium hydroxide slurry into a jacketed reaction vessel equipped with a dispersing paddle; open the dispersing paddle (linear velocity 5.6 m / s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry is cooled to 16.8°C, and then filled with carbon dioxide at a rate of 26.5 liters / minute; simultaneously, the temperature of the slurry in the reaction vessel is controlled at 16-25°C until the pH value of the slurry in the reaction vessel reaches 6.0; the reaction is completed, and the obtained Aqueous slurry of cubic precipitated calcium carbonate, products such as image 3 shown.

[0033] Depend on image 3 I...

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Abstract

The invention discloses a method for preparing cubic precipitated calcium carbonate. By controlling the temperature of a carbonization reaction, meanwhile the filling rate of carbon dioxide gas is determined according to the concentration of calcium hydroxide slurry to obtain the cubic precipitated calcium carbonate, a precipitated assistant does not need to be additionally added, and the production cost is effectively controlled.

Description

technical field [0001] The invention relates to the field of calcium carbonate, in particular to a preparation method of cubic precipitated calcium carbonate. Background technique [0002] Precipitated calcium carbonate can be prepared by charging carbon dioxide gas into a reaction vessel containing a calcium hydroxide slurry. The crystalline shapes of precipitated calcium carbonate are spindle, cubic, chain, spherical, sheet and quadrangular column. Calcium carbonate of these different crystalline forms can be prepared by controlling the reaction conditions. The general carbonization method obtains a spindle shape. [0003] At present, there have been many studies on the preparation of cubic precipitated calcium carbonate, but most of them use precipitation aids to control the morphology, which not only increases the cost, but also makes the preparation process more complicated and difficult to carry out quality control. Contents of the invention [0004] The main purp...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/181C01P2004/38
Inventor 黄议文王志高李正华何超琼姚明敏陈刚郑跃军
Owner 上海碳酸钙厂有限公司
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