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Preparation method of large-particle-size cubic precipitated calcium carbonate

A precipitated calcium carbonate, cubic technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of difficult to meet the comprehensive needs of industrial production and application market, and can not effectively control the aging The degree of improvement, the improvement of particle dispersion and other issues, to achieve the effect of low production cost, good economic benefits, and controllable particle size

Active Publication Date: 2018-03-23
山东宇信纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanism of sodium bicarbonate and sodium hydroxide is similar, and it cannot effectively control the degree of ripening and improve particle dispersion
[0008] To sum up, the current process for preparing large-size cubic precipitated calcium carbonate is still lacking, and it is difficult to meet the comprehensive needs of industrial production and application markets

Method used

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  • Preparation method of large-particle-size cubic precipitated calcium carbonate
  • Preparation method of large-particle-size cubic precipitated calcium carbonate

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preparation example Construction

[0035] The invention discloses a method for preparing large-diameter cubic precipitated calcium carbonate, which comprises the following steps:

[0036] Step 1. After the milk of lime is refined and aged for 36-48 hours, the specific gravity of the milk of lime is adjusted to 1.050-1.065, the temperature is adjusted to 15-20°C, and then transported to a carbonization reaction kettle with stirring function. The volume of the carbonization reaction kettle is 50 cubic meters, and the filling coefficient of the carbonization reaction kettle is 0.65-0.85.

[0037] Step 2: Put the purified and cooled lime kiln gas into the carbonization reaction kettle to make the milk of lime undergo carbonation reaction in the carbonization reaction kettle. 3 / min, the volume content of carbon dioxide in the lime kiln gas is 25-35%, when the conductivity of the reaction system drops to 0.5ms / cm, the carbonization reaction is stopped, and the specific surface area (BET) of the obtained calcium carb...

Embodiment 1

[0043] In the preparation process of this embodiment, the parameters adopted are as follows:

[0044] Step 1. After the milk of lime is refined and aged for 40 hours, the specific gravity of the milk of lime is adjusted to 1.065, the temperature is adjusted to 19°C, and then the milk is transported to a carbonization reactor with a stirring function. The volume of the carbonization reactor is 50 cubic meters m, the filling factor of the carbonization reactor is 0.8.

[0045] Step 2: Feed the purified and cooled lime kiln gas into the carbonization reaction kettle, so that the milk of lime undergoes carbonation reaction in the carbonization reaction kettle, and the flow rate of the kiln gas is 1200m 3 / min, the volume content of carbon dioxide in the lime kiln gas is 30%, when the conductivity of the reaction system drops to 0.5ms / cm, the carbonization reaction is stopped, and the specific surface area (BET) of the obtained calcium carbonate is 26.5m 2 / g.

[0046] Step 3: In...

Embodiment 2

[0049] In the preparation process of this embodiment, the parameters adopted are as follows:

[0050] Step 1. After the milk of lime is refined and aged for 40 hours, adjust the specific gravity of the milk of lime to 1.050, adjust the temperature to 15°C, and then transfer it to a carbonization reactor with a stirring function. The volume of the carbonization reactor is 50 cubic meters m, the filling factor of the carbonization reactor is 0.75.

[0051] Step 2: Feed the purified and cooled lime kiln gas into the carbonization reaction kettle, so that the milk of lime undergoes carbonation reaction in the carbonization reaction kettle, and the flow rate of the kiln gas is 1200m 3 / min, the volume content of carbon dioxide in the lime kiln gas is 30%, when the conductivity of the reaction system drops to 0.5ms / cm, the carbonization reaction is stopped, and the specific surface area (BET) of the obtained calcium carbonate is 43.7m 2 / g.

[0052] Step 3: In the calcium carbonat...

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Abstract

The invention discloses a preparation method of large-particle-size cubic precipitated calcium carbonate. The preparation method includes: refining and aging lime milk for 36-48 hours, regulating thespecific weight of the lime milk to be 1.050-1.065, regulating the temperature of the lime milk to be 15-20 DEG C, and feeding lime kiln gas into a carbonization reaction kettle, wherein the volume content of carbon dioxide in the lime kiln gas is 25-35%; when the conductivity of the reaction system lowers to 0.5ms / cm, stopping the carbonization reaction; adding a compound organic metal shieldingagent with the weight being 0.3-1.0% of calcium carbonate dry basis weight, stirring for 20-40 minutes, keeping the temperature of 55-90 DEG C for 1-4 hours, and feeding lime kiln gas again until thereaction system reaches carbonization end point; adding a surfactant with the weight being 2.0-5.0% of calcium carbonate dry basis weight, and stirring for 30-60 minutes to complete surface treatment.The preparation method has the advantages that the method is high in slaking efficiency, the large-particle-size cubic precipitated calcium carbonate can be obtained in a short time, and the preparedlarge-particle-size cubic precipitated calcium carbonate is excellent in dispersity, little in agglomeration and controllable in particle size; in addition, the method simple and practicable in process, low in production cost and good in economic benefits.

Description

technical field [0001] The invention relates to the technical field of preparation of precipitated calcium carbonate, in particular to a preparation method of large-size cubic precipitated calcium carbonate. Background technique [0002] Precipitated calcium carbonate is a white, non-toxic, non-irritating odor functional filler, which is widely used in plastics, rubber, coatings, sealants, inks and papermaking industries. Precipitated calcium carbonate with different particle sizes and shapes has different functions in different filling systems. For example, the spindle-shaped precipitated calcium carbonate can improve the gloss and smoothness of the paper surface; the needle-shaped or whisker-shaped precipitated calcium carbonate is highly anisotropic, and when filled in rubber, paper and other products, it can significantly improve the mechanical properties and system of the phase orientation. rheological properties; spherical precipitated calcium carbonate is an ideal to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/181C01F11/183C01P2004/03C01P2004/38C01P2004/62
Inventor 姚忠修颜干才杜年军
Owner 山东宇信纳米科技有限公司
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