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A kind of diatomite/white carbon black composite humidity control material and preparation method thereof

A humidity control material, diatomite technology, applied in the field of diatomite/white carbon black composite humidity control material and its preparation, can solve the problems of weak moisture absorption and release capacity, small hysteresis of moisture absorption and release, etc., and achieve low production cost , improved humidity control performance, and good application prospects

Active Publication Date: 2019-02-01
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the characteristics of weak moisture absorption and release ability of the above-mentioned single diatomite humidity-controlling material, and proposes a kind of diatomite as silicon source, which is prepared by partial alkali dissolution-acid analysis Diatomaceous earth / white carbon black composite humidity control material that is fast, has small moisture absorption and desorption hysteresis, and fast response

Method used

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  • A kind of diatomite/white carbon black composite humidity control material and preparation method thereof
  • A kind of diatomite/white carbon black composite humidity control material and preparation method thereof
  • A kind of diatomite/white carbon black composite humidity control material and preparation method thereof

Examples

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Embodiment 1

[0027] Raw material introduction: Diatomite comes from Linjiang Beifeng Diatomite Co., Ltd. The main chemical composition and content are SiO 2 86.97%, Al 2 O 3 3.76%, Fe 2 O 3 2.13%, MgO0.23%, CaO 0.35%, particle size 200 mesh sieve is less than 2.0%; sodium hydroxide comes from Beijing Chemical Plant, analytically pure; sulfuric acid comes from Sinopharm Chemical Reagent Co., Ltd., 98%wt.

[0028] The preparation process steps are as follows:

[0029] According to the mass ratio of diatomaceous earth and sodium hydroxide 1.75:1, add water to prepare a slurry with a mass concentration of diatomaceous earth of 20%, and stir at 90℃ for 30 minutes to prepare a mixed slurry containing sodium silicate and diatomaceous earth. ; Then add 60% sulfuric acid solution to the mixed pulp, acidify the sodium silicate to generate precipitated white carbon black, and aging for 20 minutes.

[0030] The KW-TH-225Z programmable constant temperature and humidity test box manufactured by Dongguan Kewen ...

Embodiment 2

[0044] The raw materials and process steps are the same as those in Example 1. The difference is that the diatomite and sodium hydroxide are mixed with a mass ratio of 2.0:1, and water is added to make a 20% diatomite slurry at a temperature of 80°C. Stir and dissolve in alkali for 30 minutes to prepare a mixed slurry containing sodium silicate and diatomaceous earth; then add a 50% sulfuric acid solution to the mixed slurry to form precipitated white carbon black by acid precipitation. The humidity control performance, specific surface area, pore volume, and pore size distribution measurement methods of the samples of the examples are the same as those in Example 1, and the results are listed in Table 1.

Embodiment 3

[0046] The raw materials and process steps are the same as those in Example 1. The difference is that diatomite and sodium hydroxide are mixed at a mass ratio of 2.5:1, and water is added to make a diatomite slurry with a mass concentration of 25%. The temperature is 80°C. Stir and dissolve in alkali for 30 minutes to prepare a mixed slurry containing sodium silicate and diatomaceous earth; then add 50% sulfuric acid solution to the mixed slurry, and the sodium silicate is acidified to produce precipitated white carbon black. The humidity control performance, specific surface area, pore volume, and pore size distribution measurement methods of the samples in the examples are the same as those in Example 1, and the results are listed in Table 1.

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Abstract

The invention relates to a diatomaceous earth / white carbon black composite humidity controlling material and a preparation method thereof. The preparation method comprises the following steps: first, preparing mixed ore pulp of sodium silicate and diatomaceous by taking diatomaceous earth as a silicon source and adopting a partial alkali dissolution-acid precipitation method; adding 40 to 60 mass percent of sulphuric acid solution into the mixed ore pulp; performing acid precipitation on the sodium silicate to generate precipitated white carbon black; then, aging for 20 to 40 minutes, filtering, washing and drying. The main component of the composite humidity controlling material is amorphous silicon dioxide; the nitrogen adsorption specific surface area is greater than or equal to 150 m<2> / g; the pore volume is greater than or equal to 0.20 cm<3> / g; the average pore diameter is 10 to 30 nm; the maximum humidity adsorbing amounts respectively reach 30 percent and 25 percent or higher under the relative humidity of 90 percent and 80 percent at the ambient temperature of 30 DEG C; the maximum humidity releasing amounts respectively reach 20 percent and 15 percent or higher under the relative humidity of 65 percent and 55 percent at the ambient temperature of 30 DEG C. The maximum humidity adsorbing amounts and the maximum humidity releasing amounts of the diatomaceous earth / white carbon black composite humidity controlling material are improved by 5 times or more when being compared with those of pure diatomaceous earth; the diatomaceous earth / white carbon black composite humidity controlling material has a good application prospect.

Description

Technical field [0001] The invention relates to a diatomite / white carbon black composite humidity control material and a preparation method thereof, belonging to the field of mineral materials and non-metal deep processing. Background technique [0002] Humidity is one of the important indicators for evaluating indoor air environment. Too high humidity can cause mold growth, accelerate the corrosion of the equipment, and shorten the service life of the equipment. Too low humidity can cause problems such as human skin cracks, respiratory diseases, and furniture deformation and cracking. At present, people mainly use humidifiers and air conditioners to adjust the relative humidity of indoor air. Mechanical humidity control means consume a lot of energy. Humidity control materials use the moisture absorption and release characteristics of materials to reasonably regulate indoor humidity, without consuming non-renewable energy such as electricity, and meet the needs of energy conse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/14B01J20/28B01J20/30B01D53/26
CPCB01D53/261B01D2257/80B01J20/103B01J20/14B01J20/28061B01J20/28069B01J20/28071B01J20/28083B01J2220/46
Inventor 郑水林胡志波孙志明谭烨
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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