Carbonization method for preparing nano calcium carbonate

A technology of nano-calcium carbonate and carbonization reaction, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of affecting emulsification efficiency, low contact efficiency, slow mass transfer rate, etc., and achieve good economic benefits and Social benefits, excellent product performance, and easy control of the process

Active Publication Date: 2013-02-13
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bubbles are fully pulverized in the strong shear mixer, and the gas-liquid-solid three-phase is highly mixed, which solves the problems of slow gas-liquid-solid three-phase mass transfer rate and low contact efficiency in the process of producing nano-calcium carbonate by the traditional carbonization method defect
However, there is an opposite relationship between the emulsification effect and the carbonization time. To obtain a better emulsification effect, the carbonization time needs to be extended, and the gas easily enters the emulsification pump, which greatly affects the emulsification efficiency.
[0018] Looking at these patents and methods, there are certain problems in the final nano-products: either the investment in equipment is too large and the cost is too high; or the particle size of the product is uneven and the distribution is too wide

Method used

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  • Carbonization method for preparing nano calcium carbonate
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Examples

Experimental program
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Effect test

Embodiment 1

[0052] CaCO 3 Limestone with a content greater than 98.5% is calcined at 1050±1°C for 3 hours to obtain quicklime; the mass ratio of quicklime and water is 1:4 and fully digested at 80±1°C to obtain slaked lime slurry; Dilute to Ca(OH) 2 The weight concentration is 13%; close the discharge valve 6, open the slurry inlet valve 3, introduce the slurry into the reaction kettle 4 of the present invention, adjust the temperature of the slurry to 20±1°C; start stirring, and turn on the powerful pump 7 after 10 minutes, Powerful pump 7 flow rate Q=20m 3 / h, head H=25m, when the slurry enters the Venturi tube reactor 1, the nozzle diameter is 4mm, and the water outlet speed of the nozzle reaches 30m / s and is atomized into droplets with extremely small particle size, the kiln gas inlet valve 2 is opened to control the flow Kiln gas with a volume concentration of carbon dioxide of 17% is used for a carbonization reaction. The carbonization reaction liquid and excess kiln gas continue...

Embodiment 2

[0055] CaCO 3 Limestone with a content greater than 98.5% is calcined at 1050±1°C for 3 hours to obtain quicklime; the mass ratio of quicklime and water is 1:4 and fully digested at 80±1°C to obtain slaked lime slurry; Dilute to Ca(OH) 2 The weight concentration is 14%; close the discharge valve 6, open the slurry inlet valve 3, introduce the slurry into the reaction kettle 4 of the present invention, adjust the temperature of the slurry to 18±1°C; start stirring, and turn on the powerful pump 7 after 10 minutes, Powerful pump 7 flow rate Q=30m 3 / h, head H=28m, when the slurry enters the Venturi tube reactor 1, the nozzle diameter is 3mm, and the water outlet speed of the nozzle reaches 40m / s and is atomized into very small droplets, the kiln gas inlet valve 2 is opened to control the flow Kiln gas with a carbon dioxide volume concentration of 20% is injected to carry out a carbonization reaction. The carbonization reaction liquid and excess kiln gas continue to pass into ...

Embodiment 3

[0058] CaCO 3 Limestone with a content greater than 98.5% is calcined at 1050°C for 3 hours to obtain quicklime; quicklime and water are fully digested at a temperature of 80±1°C at a mass ratio of 1:4 to obtain slaked lime slurry; the lime slurry is sieved to remove slag and diluted with water to Ca(OH) 2 The weight concentration is 13%; close the discharge valve 6, open the slurry inlet valve 3, introduce the slurry into the reaction kettle 4 of the present invention, adjust the temperature of the slurry to 20±1°C; start stirring, and turn on the powerful pump 7 after 10 minutes, Powerful pump 7 flow rate Q=40m 3 / h, head H=30m, when the slurry enters the Venturi tube reactor 1, the nozzle diameter is 3mm, and the water outlet speed of the nozzle reaches 40m / s and is atomized into very small droplets, the kiln gas inlet valve 2 is opened to control the flow Kiln gas with a carbon dioxide volume concentration of 25% is injected for a carbonization reaction. The carbonizati...

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Abstract

The invention discloses a carbonization method for preparing nano calcium carbonate. The carbonization method comprises homogenate, pressurization, primary carbonization, homogenization and secondary carbonization. The carbonization method is characterized in that refined calcium hydroxide slurry passes through the position of a nozzle of a specially made venturi tube reactor through a strong-force pump, atomization is regulated by adjusting the bore diameter of the nozzle and the water outlet speed of the strong-force pump, the atomized slurry and adsorbed kiln gas which is carbon dioxide instantly undergo a primary carbonization reaction, primary carbonization liquid undergoes a secondary carbonization reaction in an intermittent type reaction kettle, multiple circulating carbonization reactions are achieved under the effect of the strong-force pump, and nano calcium carbonate is obtained by cladding treatment. The specially made venturi tube reactor is used, the kiln gas is led in without needing an air compressor, the temperature is always maintained at a stable level in the carbonization process, and product quality is guaranteed. Device investment for the method is small, a process is easy to control, and the carbonization method is suitable for industrial production and has good economic benefit and social benefit.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic chemical materials and nanometer materials, and relates to a carbonization method, in particular to a carbonization method for preparing nanometer calcium carbonate. Background technique: [0002] Calcium carbonate is a white, non-toxic filler that is widely available. High-purity precipitated calcium carbonate with suitable particle size and shape can be obtained by adjusting the production process. Precipitated calcium carbonate is widely used in the fields of plastics, papermaking, rubber, viscose, coatings and inks. It not only plays the role of incremental filling and reduces processing costs, but also can perform functional modification on filling objects. Especially nano-calcium carbonate, because of its smaller particle size, higher specific surface area and special surface treatment, has superior properties that cannot be compared with ordinary calcium carbonate. For plastic pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 黄炜波朱勇黄炜民黄安定
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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