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A kind of hydromagnesite humidity control material and preparation method thereof

A technology for hydromagnesite and humidity control material, applied in the field of hydromagnesite humidity control material and preparation thereof, can solve the problems of reduced pore volume, decreased moisture absorption and moisture release, etc., and achieves low production cost, low technology Simple, promising results

Active Publication Date: 2018-08-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently used diatomite humidity-controlling materials are products calcined with high-temperature flux, such as products calcined with soda ash. The calcined diatomite has reduced moisture absorption and moisture release due to the decrease in pore volume [Hu Zhibo, Nonmetal Mine, Issue 5, 2015]

Method used

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  • A kind of hydromagnesite humidity control material and preparation method thereof
  • A kind of hydromagnesite humidity control material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 200 g of the raw material, and calcinate it in a laboratory rotary tube furnace with a heating rate of 10° C. / min, a calcining temperature of 300° C., and a calcining time of 4 hours. The whiteness, pore volume, specific surface area, moisture absorption and moisture release performance of the calcined product were tested, and the results are listed in Table 1.

[0019] The humidity control performance test of the sample is carried out by KW-TH-225Z programmable constant temperature and humidity test chamber. The instrument has built-in temperature and humidity sensors, micro information control processor, air heating unit, refrigeration solenoid valve, etc., which can automatically adjust the temperature and humidity in the box according to the test requirements, and exhaust the air through the rotating fan installed on the top of the box. Into the box to achieve gas circulation. The measurement process is as follows: (1) Material pretreatment: Weigh 10g of hydr...

Embodiment 2

[0023] Weigh 200 g of the raw material, and calcinate it in a laboratory rotary tube furnace with a heating rate of 10° C. / min, a calcining temperature of 400° C., and a calcining time of 3 hours. The whiteness, pore volume, specific surface area, moisture absorption and moisture release performance of the calcined product were tested, and the results are listed in Table 1.

Embodiment 3

[0025] Weigh 200 g of the raw material, and calcinate it in a laboratory rotary tube furnace, with a heating rate of 10°C / min, a calcining temperature of 500°C, and a calcining time of 2.5h. The whiteness, pore volume, specific surface area, moisture absorption and moisture release performance of the calcined product were tested, and the results are listed in Table 1.

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Abstract

The invention relates to a basic magnesite humidity controlling material and a preparation method thereof. The humidity controlling material is mainly prepared from porous MgO having a whiteness of more than or equal to 82 percent, a pore volume of more than or equal to 0.1cm<3> / g and a specific surface area of more than or equal to 30m<2> / g. According to the humidity controlling performance of the humidity controlling material, the equilibrium moisture absorption content is more than or equal to 10 percent, and the equilibrium moisture releasing content is less than or equal to - 2 percent. The preparation method comprises the steps of grinding and pulverizing basic magnesite to be less than or equal to 75mu m, and calcining at 300-750 DEG C. According to the basic magnesite humidity controlling material, crystal or constitution water and carbon dioxide of basic magnesite are removed, so that the structure is loose and porous, the porosity and specific surface area are remarkably increased, and the material has excellent moisture absorption performance, cementitious activity and flame-retarding and fire-proofing performance, can be used for producing healthy and environment-friendly inner wall decorating materials, and has excellent application prospects.

Description

technical field [0001] The invention relates to a hydromagnesite humidity-adjusting material and a preparation method thereof, belonging to the fields of mineral processing, mineral materials and applications. Background technique [0002] Indoor is the main place for human life. The humidity and cleanliness of indoor air are important criteria for evaluating the comfort and health of the indoor environment. Appropriate humidity is important for ensuring human health, prolonging the service life of indoor items, ensuring the normal operation of instruments and equipment, and maintaining the ecological environment. sustainable development is of great significance. At present, people mainly adjust the relative humidity of indoor air through mechanical means such as humidifiers and air conditioners. Mechanical humidity control not only consumes energy, but also has many disadvantages. Humidity-regulating materials rely on their own moisture absorption and desorption propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10C04B2/12
CPCC04B2/10C04B2/12
Inventor 郑水林孙志明
Owner CHINA UNIV OF MINING & TECH (BEIJING)