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Lensing spherical vaterite calcium carbonate crystal with high purity and preparation method thereof

A technology of calcium carbonate and vaterite, applied in the direction of calcium carbonate/strontium/barium, etc., to achieve strong adsorption capacity, easy control of reaction conditions, and good monodispersity

Inactive Publication Date: 2011-11-23
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At room temperature, the technology of preparing monodisperse lenticular vaterite-type calcium carbonate in aqueous solution through the method of solution mixing has not been reported yet.

Method used

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  • Lensing spherical vaterite calcium carbonate crystal with high purity and preparation method thereof
  • Lensing spherical vaterite calcium carbonate crystal with high purity and preparation method thereof
  • Lensing spherical vaterite calcium carbonate crystal with high purity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] (1) Add 5.299g of sodium carbonate into 100ml of deionized water, stir until completely dissolved, and obtain a solution with a concentration of 0.5mol / L for later use.

[0053] (2) Add 5.549g of calcium chloride into 100ml of deionized water, stir until completely dissolved to obtain a solution with a concentration of 0.5mol / L, and set aside.

[0054] (3) Dissolve 0.242g of 1-butyl-3-methylimidazolium lauryl sulfate in 77ml of deionized water, and stir until completely dissolved. Adjust the pH of the solution to 7 to obtain a solution with a concentration of 7.8mmol / L for subsequent use.

[0055] In this step, the preparation method of 1-butyl-3-methylimidazolium dodecyl sulfate is as follows: Weigh 11.86g (0.085mol) 1-butyl-3-methylimidazolium chloride and 20.32g (0.070mol ) Sodium lauryl sulfate was dissolved in 120ml of dichloromethane, and the resulting solution was placed in a 250ml Erlenmeyer flask and stirred at room temperature for 3 hours. The resulting mixe...

Embodiment 2

[0058] Steps (1) and (2) are as described in Example 1.

[0059] (3) Dissolve 0.323g of 1-butyl-3-methylimidazolium lauryl sulfate in 77ml of deionized water, and stir until completely dissolved. Adjust the pH of the solution to 7 to obtain a solution with a concentration of 10.4mmol / L for subsequent use.

[0060] (4) The preparation process is as described in step (4) in Example 1. Obtain white powdery calcium carbonate, i.e. monodisperse lenticular vaterite type calcium carbonate. The calcium carbonate powder analytical result that obtains is as follows: SEM photo ( figure 2 ) shows that the obtained calcium carbonate is a lens-shaped particle with good monodispersity, with a diameter of about 2.2-2.8 μm and a thickness of about 1-1.5 μm, wherein the nanosphere substructure is spherical nanoparticles with a size of about 100-130 nm. From Figure 5 According to the X-ray powder diffraction results, there is no miscellaneous peak in the spectrum, and the product is pure v...

Embodiment 3

[0062] Steps (1) and (2) are as described in step (1) (2) in Example 1.

[0063] (3) Dissolve 0.484g of 1-butyl-3-methylimidazolium lauryl sulfate in 77ml of deionized water, and stir until completely dissolved. Adjust the pH of the solution to 7 to obtain a solution with a concentration of 15.6mmol / L for subsequent use.

[0064] (4) The preparation process is as described in step (4) in Example 1. Obtain white powdery calcium carbonate, i.e. monodisperse lenticular vaterite type calcium carbonate. The calcium carbonate powder SEM result that obtains is similar to the result of embodiment 2. From Figure 5 According to the X-ray powder diffraction results, there is no miscellaneous peak in the spectrum, and the product is pure vaterite.

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Abstract

The invention relates to lensing spherical vaterite calcium carbonate crystals with high purity and a preparation method thereof. The calcium carbonate crystals are formed into a lensing structure with a diameter of 0.8 to 3.0 mu m and a thickness of 0.5 to 2.5 mu m through aggregation of nanosphere particles with a size of 50 to 150 nm, and the content of spherical vaterite calcium carbonate is 100%. The preparation method comprises the steps of dissolving ionic liquid surfactants into deionized water, sequentially adding the aqueous solution of sodium carbonate and the aqueous solution of calcium chloride, carrying out stirring fro even mixing, and carrying out aging, separating and air drying; therefore, monodisperse lensing spherical vaterite calcium carbonate is obtained. The preparation method provided in the invention is simple; reaction conditions are mild and easy to control; the yield of lensing spherical vaterite calcium carbonate crystals is high; therefore, the preparation method is suitable for large scale production. The calcium carbonate crystals obtained in the invention have good monodispersion and uniform distribution and can be used as fillers in the industries of papermaking and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, in particular to lenticular high-purity vaterite calcium carbonate crystals and a preparation method thereof. Background technique [0002] As an important inorganic filler in industrial production, calcium carbonate is widely used in plastics, rubber, paper, coatings, inks and other industries. Its advantages are non-toxic, white color, low price, easy processing and so on. There are many crystal forms of calcium carbonate, generally there are three crystal forms of calcite, aragonite and vaterite. Calcite is the most stable, and both vaterite and aragonite are metastable crystal forms. Conventional synthesis process, such as: carbon dioxide into calcium hydroxide for carbonation reaction or water-soluble calcium salt and carbonate for precipitation reaction, the prepared calcium carbonate is generally calcite, and the obtained calcium carbonate product is easy to aggregate an...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 于丽赵英渊杜伟焦静静王晓晴任华英刘永辉
Owner SHANDONG UNIV
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