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Preparation method for cubic precipitated calcium carbonate

A technology of precipitating calcium carbonate and cubic shape, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high pH value of products, keeping at 50-60℃, difficult to popularize and apply, etc., to achieve particle size control and pH value. Effective value control, inhibition of dissolution, simple and feasible process

Active Publication Date: 2015-05-13
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the curing temperature can only be kept at 50-60°C. After exceeding this range, cubic calcium carbonate will transform into flaky calcium carbonate.
And, no matter be sodium hydroxide or sodium bicarbonate, their addition only suppressed the dissolving of calcium hydroxide, but back to alkali phenomenon does exist, and the prepared product pH value remains high, is difficult to popularize and apply in industry

Method used

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  • Preparation method for cubic precipitated calcium carbonate
  • Preparation method for cubic precipitated calcium carbonate
  • Preparation method for cubic precipitated calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Adjust the specific gravity of milk of lime refined and aged for 48 hours to 1.055, keep the temperature at 20°C, and then transfer it to a bubbling carbonation reactor with stirring.

[0031] (2) Pass the purified and cooled lime kiln gas into the carbonation reaction kettle for carbonation reaction, the kiln gas flow rate is 8m 2 / h carried out, wherein the carbon dioxide volume content was 33%, when the pH value of the reaction mixture dropped to 7.0, the carbonation reaction was stopped, and the specific surface area (BET) of the finished product calcium carbonate was 30.12m 2 / g.

[0032] (3) Add an accelerated curing agent to the calcium carbonate slurry obtained in step (2), then heat and cure it, and keep it in the temperature range of 80° C. for 3 hours.

[0033] (4) Adjust the temperature of the calcium carbonate slurry obtained in step (3) to 90° C., add a surface treatment agent, and complete the surface treatment after stirring for 60 minutes.

[0034...

Embodiment 2

[0039] (1) Adjust the specific gravity of milk of lime refined and aged for 48 hours to 1.055, keep the temperature at 23°C, and then transport it to a bubbling carbonation reactor with stirring.

[0040] (2) Pass the purified and cooled lime kiln gas into the carbonation reaction kettle for carbonation reaction, the kiln gas flow rate is 4m 2 / h carried out, wherein the carbon dioxide volume content was 33%, when the pH value of the reaction mixture dropped to 7.0, the carbonation reaction was stopped, and the specific surface area (BET) of the finished product calcium carbonate was 24.35m 2 / g.

[0041] (3) Add an accelerated curing agent to the calcium carbonate slurry obtained in step (2), then heat and cure it, and keep it in the temperature range of 90° C. for 3 hours.

[0042] (4) Adjust the temperature of the calcium carbonate slurry obtained in step (3) to 90° C., add a surface treatment agent, and complete the surface treatment after stirring for 60 minutes.

[004...

Embodiment 3

[0048] (1) Adjust the specific gravity of milk of lime refined and aged for 48 hours to 1.055, keep the temperature at 20°C, and then transfer it to a bubbling carbonation reactor with stirring.

[0049] (2) Pass the purified and cooled lime kiln gas into the carbonation reaction kettle for carbonation reaction, the kiln gas flow rate is 4m 2 / h carried out, wherein the carbon dioxide volume content was 33%, when the pH value of the reaction mixture dropped to 7.0, the carbonation reaction was stopped, and the specific surface area (BET) of the finished product calcium carbonate was 28.64m 2 / g.

[0050] (3) Add an accelerated curing agent to the calcium carbonate slurry obtained in step (2), then heat and cure it, and keep it in the temperature range of 80° C. for 4 hours.

[0051] (4) Adjust the temperature of the calcium carbonate slurry obtained in step (3) to 90° C., add a surface treatment agent, and complete the surface treatment after stirring for 60 minutes.

[0052]...

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Abstract

The present invention discloses a preparation method for cubic precipitated calcium carbonate. The method comprises the following processes: transporting refined and aged lime cream into a carbonation bubbling reactor with stirring, injecting purified and cooled limekiln gas to carry out carbonation reaction, when pH of the reaction mixture drops to 7.0, stopping the carbonation reaction, and controlling specific surface area (BET) of the finished calcium carbonate between 20-35 m<2> / g. Adding accelerating curing agent, heating to performing curing, maintaining the temperature between 60-90 DEG C for 2-15 hours, adding a surface treating agent, stirring the materials for 60 minutes to obtain a slurry of calcium carbonate, and subjecting the slurry to pressure filtration for dewatering, drying and pulverizing to obtain the calcium carbonate product. Compared with traditional heating curing methods, the present method has a higher curing efficiency, and obtains large cubic precipitated calcium carbonate particles in short time; size control and pH value control are more effective and more stable; the processed are simple and feasible, the costs are low, and economic effectiveness is good.

Description

technical field [0001] The invention relates to a preparation method of cubic precipitated calcium carbonate, in particular to a preparation method of cubic precipitated calcium carbonate with regular appearance and outstanding micron-level dispersibility. Background technique [0002] Calcium carbonate is an important inorganic powder material, widely used in rubber, plastics, paper, ink, paint, medicine and other industries. Calcium carbonate with different particle sizes and shapes has different effects in the filling system. Spindle-shaped precipitated calcium carbonate can improve paper surface gloss and smoothness; needle-shaped precipitated calcium carbonate is highly anisotropic, and when filled in rubber, paper and other products, it can significantly improve the mechanical properties of the phase orientation and the rheological properties of the system; Spherical precipitated calcium carbonate is an ideal lubricant filling material. [0003] Cubic precipitated ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2004/61
Inventor 黄汉能朱勇陆初典李文婷
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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