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Preparation method of xonotlite crystal whisker

A technology of tobermorite and whiskers, which is applied in the field of preparation and application of inorganic non-metallic materials, can solve the problems of low purity of siliceous raw materials, difficulty in synthesizing calcium silicate whiskers, etc., and achieves excellent thermodynamic stability and beneficial effects. For popularization and application, the effect of low hydrothermal reaction temperature

Active Publication Date: 2015-03-25
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] At present, the siliceous raw materials for preparing calcium silicate are mainly crystalline quartz sand or amorphous silica fume and diatomaceous earth. Because the siliceous raw materials are not high in purity, rich in impurities, and are affected by the particle size and particle size of raw materials The influence of factors such as distribution, crystallinity, and water-solid ratio, as well as the existence of intermediate products, make it difficult to synthesize calcium silicate whiskers with large aspect ratios.

Method used

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  • Preparation method of xonotlite crystal whisker
  • Preparation method of xonotlite crystal whisker
  • Preparation method of xonotlite crystal whisker

Examples

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preparation example Construction

[0023] The invention discloses a preparation method of xonotlite whiskers, the specific steps are as follows:

[0024] 1) Grinding the active silica raw material and the lime raw material respectively to obtain active silica powder and lime powder with a particle size of 100-600 mesh; wherein, the SiO2 in the active silica raw material 2 The mass percentage of CaO is 72.90%-98.30%; the mass percentage of CaO in the calcareous raw material is 74.99%-99.10%.

[0025] 2) the active silica powder and lime powder of step 1) are replaced with SiO 2 The / CaO molar ratio is 0.85-1.25 for batching, placed in a closed reaction device, and industrial water is added; wherein, the volume-to-mass ratio of industrial water to the mixture of activated silica powder and lime powder is 15-45; Then heating for synthesis reaction, the heating temperature of the synthesis reaction is 180-225° C., the heating rate is 1.0-30.0° C. / min, and the synthesis reaction time is 2-16 hours; a reaction produ...

example 1

[0033] In this example, the active silicon dioxide raw material and the calcareous raw material are selected from the silicon dioxide slag and quicklime after acid leaching magnesium from chrysotile, respectively.

[0034] 1) Grinding the silica slag after acid leaching magnesium from chrysotile with a silica content of 98.30% and quicklime with a CaO content of 99.10%, respectively, to obtain powders with a particle size of 100 mesh;

[0035] 2) SiO2 slag and unslaked lime powder after the chryserpentine acid leaching magnesium obtained in step 1), according to the chemical composition analysis results, according to SiO 2 The / CaO molar ratio is 0.85, weighed for batching, and placed directly in the reaction kettle with a stirring device, according to the volume mass ratio of industrial water, active silica powder and lime powder mixture of 15:1, add industrial water to mix Evenly, at a heating rate of 1.0°C / min, the temperature was raised to 225°C for hydrothermal reaction, ...

example 2

[0039] The active silicon dioxide raw material and calcareous raw material selected in this example are respectively silica slag and quicklime after extracting magnesium by chrysotile fiber acid salt or ammonium salt roasting. Its preparation method is basically the same as Example 1, and will not be repeated here.

[0040] The differences are:

[0041] 1) The silica slag and quicklime with a CaO content of 98.3% after roasting the chrysotile fiber acid salt or ammonium salt with a silica content of 93.70% and quicklime with a CaO content of 98.3% are ball milled to obtain a material with a fineness of 160 mesh ;

[0042]2) The silicon dioxide slag and calcareous powder after step 1) is roasted to extract magnesium from the ground serpentine fiber acid salt or ammonium salt, according to the chemical composition analysis results, according to SiO 2 The / CaO molar ratio is 1.15 and weighed for batching, and placed directly in the autoclave, according to the volume mass ratio ...

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Abstract

The invention discloses a method for preparing a xonotlite crystal whisker by using an active silica raw material and a calcium carbonate raw material. The method comprises the following steps: (1) grinding the active silica raw material and the calcium carbonate raw material to obtain active silica powder and calcium carbonate powder; (2) batching the active silica powder or / and the calcium carbonate powder obtained in the step (1), adding industrial water and directly putting into a closed reaction unit to perform a synthesis reaction by controlling the heating rate, the reaction temperature and the reaction time; and (3) filtering and drying, namely dispersing reaction products obtained in the step (2) to obtain the xonotlite crystal whisker. The xonotlite crystal whisker prepared by the method disclosed by the invention is relatively large in crystal grain, large in length-diameter ratio, high in strength, good in stability, wide in application range and beneficial to promotion and application.

Description

technical field [0001] The invention relates to a preparation method of xonotlite whiskers, which use active silicon dioxide and lime as raw materials, and belong to the field of preparation and application of inorganic non-metallic materials. Background technique [0002] Whiskers belong to single crystal materials, and their internal atomic arrangements are highly ordered, which can be used as reinforcing materials to improve the mechanical properties of composite materials. Xonotlite whisker is a kind of calcium silicate whisker. It has good mechanical properties, thermodynamic stability and environmental friendliness. Has a wide range of uses. [0003] Xonotlite whiskers are synthesized from siliceous and calcareous raw materials through batching and hydrothermal reaction. The preparation methods of xonotlite whiskers mainly include static hydrothermal method and dynamic hydrothermal method. [0004] The selection of siliceous raw materials and calcareous raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C30B29/62C30B7/14C30B7/10
CPCC30B7/10C30B7/14C30B29/34C30B29/62
Inventor 孙红娟宋鹏程彭同江段涛
Owner SOUTHWEAT UNIV OF SCI & TECH
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