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Kaolinite lamellar crystal and preparation method thereof

A flaky crystal and kaolinite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of few studies on the exfoliation of coal-measure kaolin, and achieve significant social and environmental benefits, Solve the effect of insufficient resource reserves and good crystal shape

Inactive Publication Date: 2012-01-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently disclosed literature reports and patents on kaolin flakes and preparation of flaky kaolinite mainly use ordinary soft kaolin as the raw material for flakes, and require the kaolin raw materials to be dispersed and have a particle size of less than 5 microns. The specific surface area of ​​kaolin flake products is generally 20m 2 / g, even for nano-kaolin, its reported maximum specific surface area is only 32m 2 / g; while there are few studies on exfoliation of coal-measure kaolin

Method used

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  • Kaolinite lamellar crystal and preparation method thereof
  • Kaolinite lamellar crystal and preparation method thereof
  • Kaolinite lamellar crystal and preparation method thereof

Examples

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Embodiment 1

[0027] The preparation method is as follows: (1) mechanically pulverize coal series kaolin until the particle size is less than 43 microns; (2) prepare a mixed solution with distilled water and dimethyl sulfoxide (DMSO) at a volume ratio of 1:15, and then mix kaolin and DMSO The solution was mixed according to a mass ratio of 1:10, and after stirring continuously at 50°C for 4 hours, it was filtered with suction, and the obtained precipitate was washed with absolute ethanol, filtered with suction, and dried to obtain a kaolin / dimethyl sulfoxide intercalation complex. The intercalation rate is 90%; (3) After mixing the kaolin / dimethyl sulfoxide intercalation complex with the urea solution with a concentration of 11mol / L according to the mass ratio of 1:12, react at 20°C for 2h under stirring conditions , after suction filtration, distilled water washing, suction filtration and drying, the kaolin / urea intercalation compound was obtained, and the intercalation rate was 90%; (4) th...

Embodiment 2

[0029] The preparation method is as follows: (1) Mechanically pulverize the coal series hard kaolin until the particle size is less than 43 microns; (2) prepare a mixed solution with distilled water and dimethyl sulfoxide (DMSO) at a volume ratio of 1:8, and then mix the kaolin Mixed with DMSO solution at a mass ratio of 1:12, stirred continuously at 70°C for 48 hours, and then centrifuged. The resulting precipitate was washed with absolute ethanol, centrifuged, and dried to obtain a kaolin / dimethyl sulfoxide intercalation composite body, the intercalation rate is 94%; (3) After mixing the kaolin / dimethyl sulfoxide intercalation complex with the urea solution whose concentration is 13mol / L according to the mass ratio of 1:9, the After reacting for 48 hours, centrifuging, washing with absolute ethanol, centrifuging and drying, the kaolin / urea intercalation complex was prepared with an intercalation rate of 94%; (4) Grinding the kaolin / urea intercalation complex and zirconium sil...

Embodiment 3

[0031] The preparation method is as follows: (1) Mechanically pulverize the coal series hard kaolin until the particle size is less than 43 microns; (2) prepare a mixed solution with distilled water and dimethyl sulfoxide (DMSO) at a volume ratio of 1:10, and then mix the kaolin Mixed with DMSO solution at a mass ratio of 1:11, stirred continuously at 60°C for 24 hours, and then centrifuged. The resulting precipitate was washed with absolute ethanol, centrifuged, and dried to obtain a kaolin / dimethyl sulfoxide intercalation composite body, the intercalation rate is 98%; (3) After mixing the kaolin / dimethyl sulfoxide intercalation complex with the urea solution whose concentration is 12mol / L according to the mass ratio of 1:10, the After reacting for 1 hour, centrifuging, washing with absolute ethanol, centrifuging and drying, the kaolin / urea intercalation complex was prepared, with an intercalation rate of 97%; (4) Grinding the kaolin / urea intercalation complex and zirconium si...

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Abstract

The invention belongs to the field of kaoline deep processing technology, particularly relates to a kaolinite lamellar crystal and a preparation method thereof. The kaolinite lamellar crystal has the diameter less than 2 microns, the average diameter of 500-800nm, the thickness of less than 700nm, the average thickness of 80-300nm, and the specific surface area of 32.7-49.8m<2> / g. When the kaolinite lamellar crystal is prepared, a chemical intercalation method, a mechanical grinding method and a calcine treatment method are adopted in a combined way. The preparation method comprises the following steps of: taking the traditional common kaoline or coal series kaoline as main raw material, and firstly using dimethyl sulfoxide as intercalation agent for preparing kaoline / dimethyl sulfoxide intercalation compound; then, taking urea as the intercalation agent, and preparing kaoline / urea intercalation compound by substituting dimethyl sulfoxide molecule; and finally, carrying out mechanical grinding on the kaoline / urea intercalation compound, then carrying out calcine treatment and ultrasonic processing so as to realize lamellar stripping of the kaoline, and obtaining the kaolinite lamellar crystal with good crystalline form.

Description

technical field [0001] The invention belongs to the technical field of kaolin deep processing, in particular relates to a kaolinite flaky crystal, and also relates to a preparation method of the kaolinite flaky crystal. Background technique [0002] Kaolin is a non-metallic mineral resource mainly composed of kaolinite minerals. It is widely used in ceramics, cement, building materials, refractory materials, papermaking, coatings, rubber, plastics, chemicals, medicine and other industries. In industries such as papermaking, paint, rubber, plastics, cosmetics, etc., not only the particle size of kaolinite is required to be fine, but also the kaolinite is required to have a flaky crystal shape; in terms of particle size, the particle size of kaolinite is required to be micron, submicron or even nanometer . For example, when kaolin is used as a high-grade coating, it is required that particles smaller than 2 microns account for 90-95%, and as a paper-making filler, it is requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 许红亮陈德良王萌王海龙卢红霞张锐郭辉
Owner ZHENGZHOU UNIV
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