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Diatomite/ground limestone composite humidity controlling material and preparation method thereof

A technology of heavy calcium carbonate and humidity-regulating materials, applied in chemical instruments and methods, and other chemical processes, etc., can solve problems such as high impurity content, moisture absorption and desorption capacity that cannot meet the high moisture absorption performance of humidity-controlling materials, and enlarged pore size , to achieve the effects of simple preparation process, good application prospects and improved hygroscopic performance

Active Publication Date: 2015-08-19
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, diatomite raw ore and calcined diatomite, the former due to higher impurity content, the latter due to calcined smaller pore volume and larger pore size, its equilibrium moisture absorption and desorption capacity is not more than 10%, its moisture absorption and desorption capacity It is difficult to meet the high moisture absorption performance requirements of humidity control materials in high humidity areas

Method used

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  • Diatomite/ground limestone composite humidity controlling material and preparation method thereof
  • Diatomite/ground limestone composite humidity controlling material and preparation method thereof
  • Diatomite/ground limestone composite humidity controlling material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 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%, MgO 0.23%, CaO 0.35%, particle size 200 mesh sieve remaining 2.0%; heavy calcium carbonate from Zhangjiajie Hengliang New Material Technology Co., Ltd., CaCO 3 The content is 98.26%, the particle size is 325 mesh and the remainder is 3.0%. Its main mineral component is calcite.

[0031] The preparation process steps are as follows:

[0032] Mix diatomite and heavy calcium carbonate in a mass ratio of 1:1, mix them evenly, put them into a laboratory rotary furnace, raise the temperature to 700°C at 15°C / min, and roast at 700°C for 2.0h to prepare diatomite / Heavy calcium carbonate composite humidity control material.

[0033] 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 abso...

Embodiment 2

[0044]The same as the raw materials and process steps in Example 1, the difference is that diatomaceous earth and heavy calcium carbonate are batched in a mass ratio of 1:1, mixed uniformly, and then fed into the laboratory rotary kiln, and heated to 15°C / min. 800°C, bake at 800°C for 1.5h.

[0045] The humidity control performance, specific surface area, pore volume and pore size distribution of the sample were measured in the same way as in Example 1, and the results are listed in Table 1.

Embodiment 3

[0047] The same as the raw materials and process steps in Example 1, the difference is that diatomaceous earth and heavy calcium carbonate are batched in a mass ratio of 1:1, mixed uniformly, and then fed into the laboratory rotary kiln, and heated to 15°C / min. 650°C, bake at 650°C for 2.5h.

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

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Abstract

The invention relates to a diatomite / ground limestone composite humidity controlling material and a preparation method thereof. The preparation method comprises the following steps: by taking diatomite and ground limestone as raw materials, adopting a uniform mixing-roasting method, batching and uniformly mixing the diatomite and ground limestone according to a mass ratio of 1:(0.5-1.5), feeding the mixture into a rotary furnace, roasting at 600-850 DEG C for 1.0-3.0 hours, thereby obtaining the product. According to the composite humidity controlling material, main mineral components of the composite humidity controlling material are calcium silicate, portlandite, calcite and dehydrated diatomite, the nitrogen adsorption specific surface area is more than or equal to 8m<2> / g, the pore volume is more than or equal to 0.02cm<3> / g, and the mean pore size is 8-15nm. According to the composite humidity controlling material prepared by the method disclosed by the invention, the moisture absorption performance is obviously improved compared with the moisture absorption performance of a pure diatomite humidity controlling material, the ambient temperature is 30 DEG C, and the maximum moisture absorption content reaches 13 percent and 10 percent or more under the relative humidity of 90 percent and 80 percent; and moreover, the balanced moisture content reaches 13 percent and 9 percent or more and is improved by more than two times compared with that of pure diatomite, and the composite humidity controlling material adopts a simple preparation process, is low in production cost and has good application prospects.

Description

technical field [0001] The invention relates to a diatomite / heavy calcium carbonate composite humidity control material and a preparation method thereof, belonging to the field of non-metallic mineral materials and non-metallic deep processing. Background technique [0002] Appropriate indoor humidity is one of the important factors to ensure the comfort and health of human life. 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 use the moisture absorption and desorption properties of materials to reasonably regulate indoor humidity without any artificial resources and mechanical equipment. Relying on their own moisture absorption and desorption properties, they can sense changes in the humidity of the space to be adjusted, thereby automatically adjusting the relative humidi...

Claims

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Application Information

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IPC IPC(8): B01J20/14
Inventor 郑水林胡志波演阳孙志明
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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