Alpha-calcium sulfate hemihydrate crystal whisker with high length-diameter ratio as well as preparation method and application of alpha-calcium sulfate hemihydrate crystal whisker

A technology of calcium sulfate hemihydrate and high aspect ratio, applied in the field of materials engineering, can solve the problems of short whiskers and limited application value.

Active Publication Date: 2022-08-02
XIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation method of the relevant α-calcium sulfate hemihydrate whisker that has been reported at present, the α-calcium sulfate hemihydrate whisker morphology prepared in the acidic environment is better, but needs to go through the comparatively loaded down with trivial details process such as iron removal, also can Consume more acid and form new industrial waste acid, and prepare α-calcium sulfate hemihydrate whiskers in alkaline environment, usually only short and thick whiskers can be obtained, and the application value is limited

Method used

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  • Alpha-calcium sulfate hemihydrate crystal whisker with high length-diameter ratio as well as preparation method and application of alpha-calcium sulfate hemihydrate crystal whisker
  • Alpha-calcium sulfate hemihydrate crystal whisker with high length-diameter ratio as well as preparation method and application of alpha-calcium sulfate hemihydrate crystal whisker
  • Alpha-calcium sulfate hemihydrate crystal whisker with high length-diameter ratio as well as preparation method and application of alpha-calcium sulfate hemihydrate crystal whisker

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preparation example Construction

[0020] Some embodiments of the present invention provide a method for preparing high aspect ratio α-calcium sulfate hemihydrate whiskers, which includes: in an alkaline environment, subjecting titanium gypsum to water under the action of a composite crystal growth agent. Thermal reaction; wherein, the composite crystal form promoter includes magnesium salt and dodecyl salt.

[0021] The above scheme uses industrial solid waste titanium gypsum as a raw material, which can reduce environmental pollution and ecological damage, and obtains better α-calcium sulfate hemihydrate whiskers with high aspect ratio and high whisker output in an alkaline environment, The reason may be: the composite crystal growth agent containing magnesium salt and dodecyl salt is used. In the reaction process, magnesium salt and dodecyl salt work together, and Mg 2+ Embedded lattice with OH in alkaline environment - The selective adsorption of dodecyl salt is promoted, and then the α-calcium sulfate hem...

Embodiment 1

[0038] The present embodiment provides a preparation method of a high aspect ratio α-calcium sulfate hemihydrate whisker in an alkaline environment, the preparation method comprising the following steps:

[0039] 1) Take material. Weigh 25g of titanium gypsum according to the recipe.

[0040] 2) Prepare the slurry. The weighed titanium gypsum was dissolved in a saturated calcium hydroxide solution, the solid-liquid ratio of the slurry was controlled to be 1:12, and the pH value of the slurry was 12.

[0041] 3) Subsidence. After stirring the prepared slurry, let it stand for 1 min to remove the Al in the bottom layer. 2 O 3 , SiO 2 Wait for the insoluble matter, repeat 3 times, and then transfer the supernatant to the reaction kettle.

[0042] 4) Add crystal form promoter. In the reaction kettle of step 3), add the composite crystal form promoter of magnesium chloride and sodium dodecyl benzene sulfonate, the consumption of magnesium chloride is 6% of the quality of tit...

Embodiment 2

[0047] The present embodiment provides a preparation method of a high aspect ratio α-calcium sulfate hemihydrate whisker in an alkaline environment, the preparation method comprising the following steps:

[0048] 1) Take material. Weigh 25g of titanium gypsum according to the recipe.

[0049] 2) Prepare the slurry. The weighed titanium gypsum was dissolved in a saturated calcium hydroxide solution, the solid-liquid ratio of the slurry was controlled to be 1:12, and the pH value of the slurry was 12.

[0050] 3) Subsidence. After stirring the prepared slurry, let it stand for 1 min to remove the Al in the bottom layer. 2 O 3 , SiO 2 Wait for the insoluble matter, repeat 3 times, and then transfer the supernatant to the reaction kettle.

[0051] 4) Add crystal form promoter. In the reaction kettle of step 3), add the composite crystal form promoter of magnesium sulfate and sodium dodecylbenzenesulfonate, the consumption of magnesium sulfate is 6% of the quality of titaniu...

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Abstract

The invention discloses alpha-calcium sulfate hemihydrate whiskers with a high length-diameter ratio as well as a preparation method and application thereof, and the preparation method of the alpha-calcium sulfate hemihydrate whiskers comprises the following steps: in an alkaline environment, carrying out hydrothermal reaction on titanium gypsum under the action of a composite crystal form growth substance; wherein the composite crystal form growth substance comprises magnesium salt and dodecyl salt. By adopting the composite crystal form growth substance, Mg < 2 + > is embedded into crystal lattices to replace Ca < 2 + > on a (200) crystal face so as to reduce the adsorption of Ca < 2 + > on the crystal face, OH <-> in an alkaline environment is utilized to promote selective adsorption of dodecyl salt, and the combined action of Mg < 2 + > and OH <-> promotes directional growth of alpha-calcium sulfate hemihydrate crystal whiskers along a c axis, so that the length-diameter ratio of the crystal whiskers is increased, and the growth rate of the alpha-calcium sulfate hemihydrate crystal whiskers is increased. Compared with alpha-calcium sulfate hemihydrate whiskers prepared in other alkaline environments, the alpha-calcium sulfate hemihydrate whiskers prepared in the invention have the advantages of higher yield and more uniform morphology. The reaction is carried out in an alkaline environment, an impurity removal step is not needed, industrial waste acid is not generated, and the method is green and environment-friendly. The alpha-calcium sulfate hemihydrate whisker has a good application prospect as a reinforcing component or a toughening component in building materials, paper, rubber or plastics.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a high aspect ratio α-calcium sulfate hemihydrate crystal whisker and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of the titanium dioxide industry, the production of titanium dioxide by the sulfuric acid method produces a large amount of solid waste titanium gypsum. If it is directly stacked in the open air, it will not only waste land, but also cause environmental pollution and ecological damage. Therefore, if α-calcium sulfate hemihydrate whiskers are prepared by titanium gypsum, the utilization value of titanium gypsum can be improved, and the consumption of natural gypsum can be reduced. [0003] For the preparation of α-calcium sulfate hemihydrate whiskers, patent CN110541188A discloses a method for preparing calcium sulfate hemihydrate with high aspect ratio by using calcium sulfate dih...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/10C30B29/62C30B7/10
CPCC30B29/10C30B29/62C30B7/10
Inventor 黄佳王心雨崔志安王志杰代泓泳陈叶金应荣贺毅冯宁博
Owner XIHUA UNIV
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