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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AI-Extracted 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 con...
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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.

Application Domain

Technology Topic

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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(3)

Example Embodiment

[0022] Example 1
[0023] (1) Add 2500 grams of quicklime to 40 liters of water at 48°C and stir for 30 minutes to prepare a calcium hydroxide slurry, which is then passed through a 200-mesh sieve for use; the concentration of the calcium hydroxide slurry obtained is 61.3 grams/liter;
[0024] (2) Add the above 30 liters of calcium hydroxide slurry to the jacketed reaction vessel equipped with a dispersing paddle; turn on the dispersing slurry (linear speed 5.6 m/s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry was cooled to 11.3°C, and then filled with carbon dioxide at a rate of 29.4 liters/min. At the same time, the temperature of the slurry in the reaction vessel was controlled at 10-25°C until the pH value of the slurry in the reaction vessel reached 6.2; Aqueous slurry of cubic precipitated calcium carbonate, products such as figure 1 Shown.
[0025] by figure 1 It can be seen that calcium carbonate is cubic particles with uniform particle size and closely packed together.

Example Embodiment

[0026] Example 2
[0027] (1) Add 1,900 grams of quicklime to 30 liters of water at 48°C and stir for 30 minutes to prepare a calcium hydroxide slurry, which is then passed through a 200-mesh sieve for use; the concentration of the obtained calcium hydroxide slurry is 52.9 grams/liter;
[0028] (2) Put the above 28 liters of calcium hydroxide slurry into a jacketed reaction vessel equipped with a dispersing paddle; turn on the dispersing slurry (linear speed 5.6 m/s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry was cooled to 15.2°C, and then filled with carbon dioxide at a rate of 23.7 liters/min. At the same time, the temperature of the slurry in the reaction vessel was controlled at 14-22°C until the pH value of the slurry in the reaction vessel reached 6.2; Aqueous slurry of cubic precipitated calcium carbonate, products such as figure 2 Shown.
[0029] by figure 2 It can be seen that calcium carbonate is cubic particles with uniform particle size and closely packed together.

Example Embodiment

[0030] Example 3
[0031] (1) Add 2506 grams of quicklime to 30 liters of water at 43°C and stir for 30 minutes to prepare calcium hydroxide slurry, which is then passed through a 200-mesh sieve for use; the obtained calcium hydroxide slurry concentration is 59.2 grams/liter;
[0032] (2) Put the above 28 liters of calcium hydroxide slurry into a jacketed reaction vessel equipped with a dispersing paddle; turn on the dispersing slurry (linear speed 5.6 m/s), and fill the jacket with circulating cooling water to make the reaction vessel The calcium hydroxide slurry was cooled to 16.8°C, and then filled with carbon dioxide at a rate of 26.5 liters/min. At the same time, the temperature of the slurry in the reaction vessel was controlled at 16-25°C until the pH value of the slurry in the reaction vessel reached 6.0; the reaction was completed Aqueous slurry of cubic precipitated calcium carbonate, products such as image 3 Shown.
[0033] by image 3 It can be seen that calcium carbonate is cubic particles with uniform particle size and closely packed together.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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