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Preparation method of hollow microsphere calcium carbonate

A technology of calcium carbonate and microspheres, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc. Uneven particle size distribution and other problems, to achieve the effect of high yield, low production cost and uniform shape

Inactive Publication Date: 2020-10-13
崇左南方水泥有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for preparing hollow microsphere calcium carbonate to solve the problems of difficult control of reaction conditions, non-uniform particle size distribution and low yield of hollow microsphere calcium carbonate prepared by traditional chemical methods.

Method used

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  • Preparation method of hollow microsphere calcium carbonate
  • Preparation method of hollow microsphere calcium carbonate
  • Preparation method of hollow microsphere calcium carbonate

Examples

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Embodiment 1

[0036] Present embodiment is an example of the preparation method of hollow microsphere calcium carbonate of the present invention, comprises the following steps:

[0037]S1. Accurately weigh calcium oxide and dissolve it in deionized water, heat it to 80°C in a constant temperature water bath, stir for 2 hours, let it stand for 12 hours, digest it for 24 hours, remove the residue after passing through a 200-mesh sieve, adjust the concentration, and obtain a raw material concentration of 2 % calcium hydroxide slurry;

[0038] S2. Get 180ml of the prepared calcium hydroxide slurry and move it into the high-pressure micro-reactor, add 2% EDTA in the molar ratio of the calcium hydroxide slurry concentration, seal the high-pressure micro-reactor, open the heating device and the stirring device, and mix the solution at temperature at 80°C, at a speed of 50r·min -1 and access to CO 2 The gas increases the pressure in the reactor by 1 MPa to react for 4 hours to obtain the product ...

Embodiment 2

[0041] Present embodiment is another example of the preparation method of hollow microsphere calcium carbonate of the present invention, comprises the following steps:

[0042] S1. Accurately weigh calcium oxide and dissolve it in deionized water, heat it to 80°C in a constant temperature water bath, stir for 2 hours, let it stand for 12 hours, digest it for 24 hours, remove the residue after passing through a 200-mesh sieve, adjust the concentration, and obtain a raw material concentration of 2 % calcium hydroxide slurry;

[0043] S2. Get 180ml of the prepared calcium hydroxide slurry and move it into the high-pressure micro-reactor, add 2% EDTA in the molar ratio of the calcium hydroxide slurry concentration, seal the high-pressure micro-reactor, open the heating device and the stirring device, and mix the solution at temperature at 100°C, at a speed of 50r·min -1 and access to CO 2 The gas increases the pressure in the reactor by 1 MPa to react for 4 hours to obtain the p...

Embodiment 3

[0046] Present embodiment is another example of the preparation method of hollow microsphere calcium carbonate of the present invention, comprises the following steps:

[0047] S1. Accurately weigh calcium oxide and dissolve it in deionized water, heat it to 80°C in a constant temperature water bath, stir for 2 hours, let it stand for 12 hours, digest it for 24 hours, remove the residue after passing through a 200-mesh sieve, adjust the concentration, and obtain a raw material concentration of 2 % calcium hydroxide slurry;

[0048] S2. Get 180ml of the prepared calcium hydroxide slurry and move it into the high-pressure micro-reactor, add 2% EDTA in the molar ratio of the calcium hydroxide slurry concentration, seal the high-pressure micro-reactor, open the heating device and the stirring device, and mix the solution at temperature at 120°C, at a speed of 50r·min -1 and access to CO 2 The gas increases the pressure in the reactor by 1 MPa to react for 4 hours to obtain the p...

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Abstract

A preparation method of hollow microsphere calcium carbonate comprises the following steps: accurately weighing a certain amount of calcium oxide, dissolving the calcium oxide in deionized water, heating, stirring, standing for digesting, screening, and concentrating to obtain a calcium hydroxide slurry with the concentration of 2% as a raw material; transferring the prepared calcium hydroxide slurry into a high-pressure reaction kettle, adding 2-10% EDTA according to a certaub concentration molar ratio of the calcium hydroxide slurry to the EDTA, and reacting the mixed solution for 4 h at thetemperature of 80-160 DEG C and the rotating speed of 50 r.min<-1> under the condition that pure CO2 gas is introduced to make the pressure in the kettle at 1-3 MPa to obtain a product slurry; and carrying out suction filtration and washing on the product slurry, carrying out vacuum drying on the obtained solid at 80 DEG C for 10 hours, and finally grinding into powder to obtain the hollow microsphere calcium carbonate. The method has the advantages of being low in production cost, high in yield, stable in quality, good in product dispersity, environmentally friendly and the like, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of hollow microsphere calcium carbonate. Background technique [0002] Calcium carbonate is very abundant in nature, and it is also a common chemical raw material. Its industrial production has a long history. In industry and daily life, calcium carbonate is often widely used as industrial filler and home decoration material. With the progress of the society and the development of the economy, the demand for the properties of calcium carbonate in industry has become diversified, and calcium carbonate with various shapes has played its unique role in different fields. Nowadays, scientific researchers continue to explore the unique role of calcium carbonate with various shapes in the production of various industries, which has also made great progress in the research on the preparation of calcium carbonate wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/181C01P2002/72C01P2002/88C01P2004/03C01P2004/04C01P2004/62C01P2004/61C01P2004/34
Inventor 李立硕史刘宾唐名德汤勇王剑楠贺路路刘曦曦刘晨民覃玲意童张法廖丹葵
Owner 崇左南方水泥有限公司
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