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A kind of aluminum oxide/diatomite composite humidity control material and its preparation method

A technology for humidity control material and diatomite, which is applied in chemical instruments and methods, heating methods, air conditioning systems, etc., can solve the problems of small moisture absorption and release lag, difficult to meet the requirements of high moisture absorption capacity, etc., and achieves low production cost, Good application prospect and simple preparation process

Active Publication Date: 2019-04-09
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the present situation that the above-mentioned single diatomite, especially the diatomite filter aid is difficult to meet the requirement of high moisture absorption capacity in high humidity areas, the present invention proposes a compound preparation of diatomite and mesoporous alumina Alumina / diatomite composite humidity control material with strong moisture release ability, fast response speed and small moisture absorption and release hysteresis

Method used

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  • A kind of aluminum oxide/diatomite composite humidity control material and its preparation method
  • A kind of aluminum oxide/diatomite composite humidity control material and its preparation method
  • A kind of aluminum oxide/diatomite composite humidity control material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Raw material introduction: Diatomite filter aid comes from Linjiang Xinghui Filter Aid Co., Ltd., the main chemical composition and content are SiO 2 93.01%, Al 2 o 3 1.33%, Fe 2 o 3 1.37%, MgO 0.11%, CaO 0.25%, loss on ignition 0.77%, whiteness 88%, particle size 200 mesh sieve remaining 2.2%.

[0025] The preparation process steps are as follows:

[0026] Mix 10g of diatomite filter aid with crystalline aluminum chloride, ammonium carbonate, and absolute ethanol at a mass ratio of 1:2:2:15, mix them uniformly, and put them into a laboratory reactor, and react hydrothermally at 180°C After 12 hours, filter, wash, and dry, put it into a laboratory rotary tube furnace and roast at 800°C for 4 hours to prepare alumina / diatomaceous earth filter aid composite humidity-controlling material.

[0027] A KW-TH-225Z programmable constant temperature and humidity test chamber manufactured by Dongguan Kewen Test Equipment Co., Ltd. was used to measure the moisture absorption ...

Embodiment 2

[0043] The raw materials and process steps are the same as those in Example 1, except that diatomaceous earth, crystalline aluminum chloride, ammonium carbonate, and absolute ethanol are dosed in a mass ratio of 1:2:3:17, and the hydrothermal temperature is 150°C , The hydrothermal time is 16h, the calcination temperature is 750℃, and the calcination time is 4.5h.

[0044] The humidity control performance, specific surface area, pore volume, pore size distribution and whiteness measurement method of the sample are the same as in Example 1, and the results are listed in Table 1.

Embodiment 3

[0046]The process steps are the same as in Example 1, except that the raw material used is diatomite after physical beneficiation, diatomite and crystalline aluminum chloride, ammonium carbonate, dehydrated alcohol according to 1:2:2:18 The mass ratio ingredients, the hydrothermal temperature is 210°C, the hydrothermal time is 8h, the roasting temperature is 650°C, and the roasting time is 3.5h.

[0047] Raw material introduction: Diatomite concentrate comes from Linjiang Beifeng Diatomite Co., Ltd. in Jilin Province. The main chemical composition and content are SiO 2 90.25%, Al 2 o 3 1.23%, Fe 2 o 3 0.44%, MgO 0.10%, CaO 0.01%, loss on ignition 7.74%, whiteness 81%, particle size 200 mesh sieve remaining 1.7%.

[0048] The humidity control performance, specific surface area, pore volume, pore size distribution and whiteness measurement method of the sample are the same as in Example 1, and the results are listed in Table 1.

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Abstract

The invention relates to an alumina / diatomite composite humidity control material and its preparation method. The method utilizes diatomite, crystalline aluminum chloride, ammonium carbonate and anhydrous ethanol as raw materials and utilizes a hydrothermal roasting method. The preparation method comprises that diatomite, crystalline aluminum chloride, ammonium carbonate and anhydrous ethanol are uniformly mixed according to a mass ratio of 1: 1-5: 1-4: 10-20 and then undergo a hydrothermal reaction in a hydrothermal reactor at a hydrothermal temperature of 120-250 DEG C for 6.0-24.0h, and the reaction product is filtered, washed and dried and then is roasted at a temperature of 600-1000 DEG C for 3.0-6.0h. The alumina / diatomite composite humidity control material has a nitrogen adsorption specific surface area greater than or equal to 120m<2> / g, pore volume greater than or equal to 0.02cm<3> / g, the average pore size of 5-10nm and whiteness greater than or equal to 90%. The alumina / diatomite composite humidity control material prepared by the method has the advantages of moisture absorption and desorption capacity 2 times or more higher than that of the pure diatomite, simple processes, no secondary pollution, low production cost and good application prospect in the field of inorganic humidity control materials.

Description

technical field [0001] The invention relates to an alumina / diatomite composite humidity control material and a preparation method thereof, belonging to the field of non-metal mineral materials and non-metal deep processing. Background technique [0002] As people pay more attention to the quality of indoor air environment, diatom mud, as a new type of environmentally friendly and healthy decoration material, has gradually entered the public family. As one of the important functional components in diatom mud, the humidity-controlling performance of diatom earth directly affects the quality of diatom mud products. Diatomaceous earth is a kind of biogenic siliceous sedimentary rock, which has a developed three-dimensional pore structure composed of micropores, mesopores and macropores, and has good humidity control performance. At present, my country's low-grade second- and third-grade diatomites are relatively abundant, and high-quality first-grade diatomite resources are ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/14B01J20/30F24F3/14
CPCB01J20/08B01J20/14F24F3/1411
Inventor 孙志明郑水林
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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