Method for preparing hollow nano calcium carbonate by utilizing ultrasonic aerosol

A nano-calcium carbonate and aerosol technology, which is applied in the direction of calcium carbonate/strontium/barium, nanotechnology, inorganic non-active ingredients, etc., can solve the problems of low carbon dioxide utilization rate, high power consumption, low cost performance, etc., and achieve carbonization reaction and Sufficient dehydration and drying, accelerated production rate, and good water absorption performance

Active Publication Date: 2020-04-17
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the process technology is complicated, the power consumption is high, and the output is low
The utilization rate of carbon dioxide is low, and the cleaning process is complicated
Therefore, the cost performance is low, and it is suitable for the production of products with high added value

Method used

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  • Method for preparing hollow nano calcium carbonate by utilizing ultrasonic aerosol
  • Method for preparing hollow nano calcium carbonate by utilizing ultrasonic aerosol
  • Method for preparing hollow nano calcium carbonate by utilizing ultrasonic aerosol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] See Figure 4 , a device for preparing hollow nano-calcium carbonate by ultrasonic aerosol method, comprising a gas source device 1, a drying device 2, a flow control device 3, a heating device 4, an ultrasonic aerosol device 5, the outlet end of the gas source device 1 It communicates with the inlet end of the drying device 2, the outlet end of the drying device 2 communicates with the inlet end of the flow control device 3, and the outlet end of the flow control device 3 communicates with the inlet end of the heating device 4 , the outlet end of the heating device 4 communicates with the inlet end of the ultrasonic aerosol device 5 . Preferably, the drying device 2 is used to place a desiccant or the drying device is a freeze dryer; the gas source device 1 is provided with a pressure reducing valve. Further, the ultrasonic aerosol device 5 is provided with an ultrasonic transducer 6 .

[0035]The structure of the device in this implementation is simple and easy to o...

Embodiment 2

[0052] A kind of method utilizing ultrasonic aerosol to prepare hollow nano-calcium carbonate, comprises the steps:

[0053] 1) Drying of carbon dioxide: depressurize the carbon dioxide in the carbon dioxide gas source to maintain the air pressure at 1.5 MPa, pass it into the drying device to remove the moisture in the carbon dioxide gas, and obtain dry carbon dioxide gas for future use;

[0054] 2) metering of carbon dioxide: pass the dried carbon dioxide gas into the metering device in step 1) to measure and control the flow;

[0055] 3) Carbon dioxide heating: pass the carbon dioxide gas through the metering device into the heating device, heat the carbon dioxide gas to a temperature of 55°C, and set it aside;

[0056] 4) Carbonization of calcium hydroxide droplets: the carbon dioxide gas after heating in step 3) is passed in the ultrasonic aerosol generating device, and the concentration of 0.25% calcium hydroxide emulsion is formed with the mass percentage placed in the u...

Embodiment 3

[0063] A kind of method utilizing ultrasonic aerosol to prepare hollow nano-calcium carbonate, comprises the steps:

[0064] 1) Drying of carbon dioxide: depressurize the carbon dioxide in the carbon dioxide gas source to maintain the air pressure at 3MPa, pass it into the drying device to remove the moisture in the carbon dioxide gas, and obtain dry carbon dioxide gas for future use;

[0065] 2) metering of carbon dioxide: pass the dried carbon dioxide gas into the metering device in step 1) to measure and control the flow;

[0066] 3) Carbon dioxide heating: pass the carbon dioxide gas through the metering device into the heating device, heat the carbon dioxide gas to a temperature of 70°C, and set it aside;

[0067] 4) Carbonization of calcium hydroxide droplets: the carbon dioxide gas heated in step 3) is passed into the ultrasonic aerosol generating device, and the concentration of 0.5% calcium hydroxide emulsion with the mass percentage placed in the ultrasonic aerosol g...

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Abstract

The invention relates to the technical field of preparation of nano hollow materials, in particular to a method for preparing hollow nano calcium carbonate by using ultrasonic aerosol, which comprisesthe following steps: 1) drying carbon dioxide; 2) metering carbon dioxide; 3) heating carbon dioxide; and 4) carbonizing the calcium hydroxide liquid drops. The hollow nano calcium carbonate preparedby the method can be used as a carrier particle for coating other components; in addition, calcium hydroxide emulsion droplets in an ultrasonic aerosol generating device are used for generating calcium hydroxide solution aerosol in a dry heat and excessive carbon dioxide atmosphere; calcium carbonate crystals are generated on the surfaces of the aerosol droplets to form a shell layer, and meanwhile, surface moisture of the calcium hydroxide emulsion droplets is evaporated in the carbonization process, so that the calcium hydroxide emulsion droplets lose water, and finally, hollow nano calciumcarbonate is formed.

Description

technical field [0001] The invention relates to the technical field of preparation of nanometer hollow materials, in particular to a method for preparing hollow nanometer calcium carbonate by using ultrasonic aerosol. Background technique [0002] Hollow nano-calcium carbonate has been widely used in biomedicine, environment, chemistry, food and other fields due to its small particle size, large specific surface area, and non-toxicity. In the production process of nano-calcium carbonate, one of the key processes affecting product quality is the carbonization process. Carbonization is a controlling process that determines the morphology and particle size of calcium carbonate crystals. At present, the process flow of various nano-calcium carbonate production technologies in my country is basically the same, and the fundamental difference lies in the carbonization process and its equipment. According to different carbonization processes, the production methods of nano-calcium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00A61K47/02
CPCC01F11/18B82Y40/00A61K47/02C01P2004/34Y02P20/141
Inventor 秦贯丰彭可文丁中祥翁万良
Owner DONGGUAN UNIV OF TECH
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