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A carbonization reactor and a method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value

A nano calcium carbonate, high dispersibility technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of poor nano calcium carbonate dispersibility, high oil absorption value, low oil absorption value, etc., to achieve good dispersion, uniform and stable crystal nucleus , to ensure the effect of dispersion

Active Publication Date: 2019-09-03
江西势通钙业有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by this invention is to overcome the above shortcoming of the prior art: provide a kind of carbonization reactor and adopt this carbonization reactor to prepare the method for small particle size, high dispersibility, low oil absorption value nano-calcium carbonate, to solve small The problem of poor dispersion and high oil absorption value of nano-calcium carbonate with particle size

Method used

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  • A carbonization reactor and a method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value
  • A carbonization reactor and a method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value
  • A carbonization reactor and a method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value

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Embodiment 1

[0039] Such as figure 1 The shown carbonization reactor of the present invention comprises a liquid film nucleator 1 and a crystal grower 2, the upper end of the liquid film nucleator 1 is provided with a slurry inlet-11 and a slurry outlet-14, and the lower end is provided with The gas inlet one 12, the slurry inlet one 11 and the slurry outlet one 14 are respectively located on both sides of the liquid film nucleator 1, and the liquid film nucleator 1 is also provided with a gas distributor 13; the crystal grower 2 The upper end is provided with a slurry inlet 2 21, the lower end is provided with a gas inlet 22 and a slurry outlet 2 23, the crystal grower 2 is also provided with a stirrer 24, and the crystal grower 2 is provided with a motor 25 connected with the stirrer 24 , the first slurry outlet 14 and the second slurry inlet 21 are communicated through the pump 3, and the first slurry inlet, the second slurry inlet, the first gas inlet and the second gas inlet are all e...

Embodiment 2

[0056] The method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value by using the carbonization reactor comprises the following steps:

[0057] 1. The lime is calcined, and the lime should be partially burned during the calcination process, so that the whiteness of the calcined lime is above 95%;

[0058] 2. Select lime particles with a whiteness of more than 95% through the color sorter and add them to the digester, add water to carry out the digestion reaction to obtain calcium hydroxide coarse slurry, and pass the calcium hydroxide coarse slurry through 100 mesh, 200 mesh, and 325 mesh in sequence , 500 mesh sieves to obtain calcium hydroxide essence;

[0059] 3. Add water to the calcium hydroxide refined slurry to adjust the mass percentage concentration to 7%, and exchange heat with cooling water below 7°C through a plate heat exchanger, so that the temperature of the calcium hydroxide refined slurry is reduced to 8...

Embodiment 3

[0071] The method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value by using the carbonization reactor comprises the following steps:

[0072] 1. The lime is calcined, and the lime should be partially burned during the calcination process, so that the whiteness of the calcined lime is above 95%;

[0073] 2. Select lime particles with a whiteness of more than 95% through the color sorter and add them to the digester, add water to carry out the digestion reaction to obtain calcium hydroxide coarse slurry, and pass the calcium hydroxide coarse slurry through 100 mesh, 200 mesh, and 325 mesh in sequence , 500 mesh sieves to obtain calcium hydroxide essence;

[0074] 3. Add water to the calcium hydroxide refined slurry to adjust the mass percentage concentration to 8%, and exchange heat with cooling water below 7°C through a plate heat exchanger, so that the temperature of the calcium hydroxide refined slurry is reduced to 1...

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Abstract

The invention discloses a carbonization reactor and method for preparing small-grain-size high-dispersity low-oil-absorption nano calcium carbonate and relates to the technical field of nano calcium carbonate. The carbonization reactor comprises a liquid film nucleator and a crystal grower, wherein a gas distributor is arranged in the liquid film nucleator; and a stirrer is arranged in the crystalgrower. The method for preparing small-grain-size high-dispersity low-oil-absorption nano calcium carbonate by the carbonization reactor comprises the steps of calcination, digestion, filtration, cooling, primary carbonization, aging, secondary carbonization, surface treatment, pressure filtration dehydration, drying, crushing and other procedures of lime to obtain nano calcium carbonate. The prepared nano calcium carbonate is cubic and has the primary grain size of 20-30 nm. A test by a Malvern laser particle analyzer shows that the prepared nano calcium carbonate adopts unimodal distribution, has the average grain size of 220 nm and oil absorption of less than 18 mlDOP / 100 g CaCO3, and has the advantages of small grain size, excellent dispersity, low oil absorption, low production costand stable quality.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate, in particular to a carbonization reactor and a method for preparing nano-calcium carbonate with small particle size, high dispersion and low oil absorption value by using the reactor. Background technique [0002] Currently, about nano-CaCO 3 There are many preparation methods for calcium carbonate, and the preparation methods of calcium carbonate are divided into liquid phase reaction method and carbonization method. The liquid phase reaction method prepares calcium carbonate through the reaction between two solutions of calcium salt and calcium carbonate salt or bicarbonate. Due to the limitations of small amount and difficult control of the preparation process, it is difficult to expand its application. The carbonization method is currently the main method for industrial production of nano-calcium carbonate. The source of raw materials for this method is extensive, and the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 张华张志宏张智伟李建永雷霆胡娟李军奇
Owner 江西势通钙业有限公司
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