Method for preparing 0.84 nm kaolinite hydrate by hydrazine hydrate-kaolinite intercalation complex

A technology of intercalation complex and hydrated kaolinite, applied in silicon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem that the content of hydrated kaolinite needs to be increased, the preparation period of hydrated kaolinite is long, and the preparation conditions are harsh. and other problems, to achieve the effect of simple heat treatment process, easy production and short processing time

Inactive Publication Date: 2012-10-03
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, this preparation method is relatively harsh and demanding compared with the preparation conditions; and the kaolinite-urea intercalation complex precursor is relatively long in formation time, so the preparation cycle of the entire hydrated kaolinite is relatively long. The content of the formed hydrated kaolinite also needs to be increased

Method used

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  • Method for preparing 0.84 nm kaolinite hydrate by hydrazine hydrate-kaolinite intercalation complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. Weigh 1 g of kaolinite, measure 20 ml of hydrazine hydrate, put them into a closed glass container and mix them, and stir on a magnetic stirrer for 24 hours at room temperature to obtain hydrazine hydrate-kaolinite intercalation complex and hydrazine hydrate mixture.

[0026] b. Centrifuge the mixture, remove the upper liquid, add absolute ethanol, mix well, centrifuge again, repeat once, wash away excess hydrazine hydrate, and obtain hydrazine hydrate-kaolinite intercalation complex;

[0027] c. Treat the hydrazine hydrate-kaolinite intercalation complex at 40° C. for 8 hours.

[0028] The hydrated kaolinite X-ray diffraction prepared by the above steps figure 1 (a), the interlayer spacing is expanded from 0.72nm of the original stone to 0.84nm, and the obtained hydrated kaolinite content is 87%. Such as figure 1 (a) shown.

Embodiment 2

[0030] a. Weigh 0.5g of kaolinite, measure 20ml of hydrazine hydrate, mix in a closed glass container, and stir on a magnetic stirrer at room temperature for 36h to obtain hydrazine hydrate-kaolinite intercalation complex and hydrazine hydrate Hydrazine mixture.

[0031] b. Centrifuge the mixture, remove the upper liquid, add absolute ethanol, mix well, centrifuge again, repeat once, wash away excess hydrazine hydrate, and obtain hydrazine hydrate-kaolinite intercalation complex;

[0032] c. Treat the hydrazine hydrate-kaolinite intercalation complex at 57° C. for 4 hours.

[0033] The hydrated kaolinite X-ray diffraction prepared by the above steps figure 1 (b), the interlayer spacing is expanded from 0.72nm of the original stone to 0.84nm, and the obtained hydrated kaolinite content is 87%. Such as figure 1 (b) shown.

Embodiment 3

[0035] a. Weigh 1.5g of kaolinite, measure 20ml of hydrazine hydrate, mix them in a closed glass container, and stir on a magnetic stirrer for 48 hours at room temperature to obtain hydrazine hydrate-kaolinite intercalation complex and hydrazine hydrate Hydrazine mixture.

[0036] b. Centrifuge the mixture, remove the upper liquid, add absolute ethanol, mix well, centrifuge again, repeat once, wash away excess hydrazine hydrate, and obtain hydrazine hydrate-kaolinite intercalation complex;

[0037] c. Treat the hydrazine hydrate-kaolinite intercalation complex at 60° C. for 2 hours.

[0038] The hydrated kaolinite X-ray diffraction prepared by the above steps figure 1 (c), the interlayer spacing is expanded from 0.72nm of the original stone to 0.84nm, and the obtained hydrated kaolinite content is 83%. Such as figure 1 (c) shown.

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Abstract

The invention discloses a method for preparing a 0.84 nm kaolinite hydrate by a hydrazine hydrate-kaolinite intercalation complex. The method comprises the steps as follows: mixing kaolinite powders with hydrazine hydrates according to a ratio for 24 to 48 h so as to obtain a mixture of the hydrazine hydrate-kaolinite intercalation complex and the redundant hydrazine hydrates; centrifuging and washing the mixture twice by using absolute ethanol so as to obtain the hydrazine hydrate-kaolinite intercalation complex; and thermally treating the obtained complex for 8 to 1 h at the temperature of 40 to 80 DEG C so as to obtain the 0.84 nm kaolinite hydrate. The 0.84 nm kaolinite hydrate prepared by the method can exist stably in the air for a long time and is used to serve as a precursor for preparing other kaolinite intercalation complexes. The adopted raw materials are environment-friendly, the preparation process is simple and quick, the cost is low and the industrial production is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing hydrated kaolinite, in particular to a method for preparing 0.84nm hydrated kaolinite from a hydrazine hydrate-kaolinite intercalation compound. Background technique [0002] Kaolinite is an important non-metallic mineral resource. It is mainly composed of kaolinite minerals such as micro flakes, tubes, and laminations. It is widely used in papermaking, ceramics, paints, rubber, plastics, petrochemicals, etc. field. [0003] Inserting some functional molecules between kaolinite layers to form an intercalation complex has always been a hot spot in the research of kaolinite industry. It has great research and development in the fields of electrochemistry, drug delivery, polymer nanocomposites, catalysts, etc. Value. Since kaolinite (Al 2 Si 2 o 5 (OH) 4 ) is a typical 1:1 layered silicate, and the layers are connected by hydrogen bonds formed between aluminum hydroxyl groups and silicon oxygen groups....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 杜丕一周璟徐剑锋马宁韩高荣翁文剑赵高凌沈鸽宋晨路程逵徐刚张溪文
Owner ZHEJIANG UNIV
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