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A kind of preparation method of high-purity calcium carbonate whisker

A calcium carbonate whisker, high-purity technology, applied in chemical instruments and methods, single crystal growth, single crystal growth and other directions, can solve the problems of small distribution of large bubbles, reduced whisker purity, uneven distribution of carbonate ions, etc. , to achieve the effect of improving utilization efficiency, reducing preparation cost and uniform concentration

Active Publication Date: 2020-09-18
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A key problem in the preparation of high-purity whiskers is that the carbonate ions are unevenly distributed in the suspension, resulting in excessive supersaturation in some areas, which easily generates calcite phase calcium carbonate and reduces the purity of whiskers; the main reason is that the use of latex tubes in the past Large bubbles are generated at the bottom of the solution during aeration. These large bubbles have a small distribution range. The concentration of carbonate ions at and above the position where the bubbles emerge is too high, and calcite is quickly formed, while other places with low saturation slowly generate aragonite phase whiskers. Not conducive to the preparation of high-purity calcium carbonate whiskers

Method used

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  • A kind of preparation method of high-purity calcium carbonate whisker
  • A kind of preparation method of high-purity calcium carbonate whisker
  • A kind of preparation method of high-purity calcium carbonate whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Calcining and decomposing calcium carbonate with an average particle size of 1.29 μm at high temperature into calcium oxide;

[0025] Step 2: Weigh 7.84g of calcium oxide, add it to 600ml of deionized water and fully digest it at 100°C;

[0026] Step 3: Take by weighing 42.693g magnesium chloride as the crystal form control agent (making the magnesium-calcium atomic molar ratio be 1.5), add 100ml water to dissolve, and digest the Ca(OH) 2 The suspension is added to the magnesium chloride solution by atomizing spray, and stirred evenly;

[0027] Step 4: Use quartz air stone with an average pore diameter of 0.92mm to feed carbon dioxide gas to the bottom of the reaction device at a flow rate of 10ml / min, and the stirring rate is 100r / min, and carry out the carbonization reaction until the pH value of the solution is 7. The reaction stops, and finally the The resulting precipitate was suction filtered, washed and dried.

[0028] The SEM images of the prepared cal...

Embodiment 2

[0030] Step 1: calcining and decomposing calcium carbonate with an average particle size of 2.77 μm at high temperature into calcium oxide;

[0031] Step 2: Weigh 7.84g of calcium oxide, add it to 600ml of deionized water and fully digest it at 90°C;

[0032] Step 3: Take by weighing 56.942g magnesium chloride (making the magnesium-calcium mol ratio be 2) as the crystal form control agent, add 100ml water to dissolve, and the Ca(OH) after digestion 2 The suspension is sprayed into the magnesium chloride solution and stirred evenly;

[0033] Step 4: Use an air stone with a pore diameter of 2.82mm to pass carbon dioxide gas to the bottom of the reaction device at a flow rate of 25ml / min, and the stirring rate is 150r / min, and carry out the carbonization reaction until the pH value of the solution is 7. The reaction stops, and finally the obtained precipitation is carried out. Suction filtration, washing and drying.

[0034] The SEM images of the prepared calcium carbonate whis...

Embodiment 3

[0036] Step 1: Calcining and decomposing calcium carbonate with an average particle size of 4.24 μm at high temperature into calcium oxide;

[0037] Step 2: Weigh 7.84g calcium oxide, add it into 600ml deionized water and fully digest it at 80°C;

[0038] Step 3: Take by weighing 71.155g magnesium chloride (making the magnesium-calcium mol ratio be 2.5) as crystal form control agent, add 100ml water to dissolve, and the Ca(OH) after digestion 2 The suspension is sprayed into the magnesium chloride solution and stirred evenly;

[0039] Step 4: Use quartz air stone with a pore diameter of 4.94mm to pass carbon dioxide gas to the bottom of the reaction device at a flow rate of 40ml / min, and the stirring rate is 200r / min, and carry out the carbonization reaction until the pH value of the solution is 7. The reaction stops, and finally the resulting precipitate Suction filtration, washing, and drying.

[0040] The SEM images of the prepared calcium carbonate whiskers are shown in ...

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Abstract

The invention discloses a method for preparing a high-purity calcium carbonate crystal whisker. The method comprises the following steps: calcining a calcium carbonate raw material, and decomposing into calcium oxide; digesting the calcium oxide in deionized water at a certain temperature; injecting into a crystal-growing controlling agent solution, uniformly stirring, introducing carbon dioxide by utilizing an aeration device at a certain speed so as to control the bubble size and dispersibility, namely carbanion concentration of the introduced gas, and enable the carbonization reaction to beuniform to prepare the high-purity crystal whisker. By adopting the method, the problem of low crystal whisker purity caused by non-uniform dispersion of a gas in the solution in a ventilating preparation process by utilizing a latex tube can be solved, and the gas and solution can be contacted more sufficiently, so that the crystal whisker with higher purity can be prepared, and the carbon dioxide gas can be saved to a great extent, and the preparation cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic filling materials, in particular to a preparation method of high-purity calcium carbonate whiskers. Background technique [0002] Inorganic whiskers have a relatively complete structure and few defects, and their strength and modulus are close to the theoretical values ​​of complete crystals, and their flame retardancy is better than that of organic whiskers, so they become ideal reinforcing and toughening materials for composite materials, such as ZnO and SiC. , Potassium titanate, mullite, aluminum borate, etc. have been industrialized, but high cost has hindered large-scale application, while calcium carbonate whiskers have a wide range of raw materials and low production costs, and can even be prepared from industrial waste residues. The most important inorganic whisker material. [0003] At present, scholars at home and abroad have done a lot of research on the preparation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/14C30B29/22C30B29/62
CPCC30B7/14C30B29/22C30B29/62
Inventor 王宗荣李庆蕾尹翀戴正冠杜丕一
Owner ZHEJIANG UNIV