The preparation method of anhydrous calcium sulfate whisker
A technology of anhydrous calcium sulfate and whiskers, which is applied in the field of preparing anhydrous calcium sulfate whiskers by one-step hydrothermal method, can solve the problems of high industrial cost, and achieve the effects of reducing production costs, easy operation, and simple process
Active Publication Date: 2018-01-09
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology
Although this process does not require burning treatment at 600°C to 700°C, high temperature decrystallization water operation at 250°C to 300°C is still required in the process of transforming calcium sulfate hemihydrate whiskers to anhydrous calcium sulfate whiskers , so the industrial cost is still high
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[0027] refer to figure 1 , the preparation method of the anhydrous calcium sulfate whisker according to the embodiment of the present invention comprises the steps:
[0028] In step 110, the raw gypsum is placed in water to form a first suspension. Wherein, the liquid-solid mass ratio of water to raw gypsum is 5.5-30:1.
[0029] In step 120, a crystal form control agent is added to the first suspension and stirred to form a white slurry.
[0030] Specifically, the molar ratio of crystal form control agent to raw gypsum is 0.7-5:1; wherein, the crystal form control agent can be selected from any one of calcium chloride, ammonium chloride, magnesium chloride, and ammonium sulfate.
[0031] In step 130, the white slurry is transferred to a hydrothermal reaction tank, and the white slurry is subjected to a hydrothermal reaction to obtain a second suspension.
[0032] Specifically, the setting temperature of the hydrothermal reaction kettle is 170°C-220°C, and the hydrothermal r...
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The invention belongs to the technical field of whisker preparation, and in particular relates to a method for preparing anhydrous calcium sulfate whiskers by a one-step hydrothermal method, comprising the steps of: A, placing raw gypsum in water, preparing the first suspension, and pouring it under stirring A crystal form control agent is added to form a slurry; wherein, the liquid-solid mass ratio of water to gypsum is 5.5 to 30:1; the molar ratio of crystal form control agent to gypsum is 0.7 to 5:1; B. Transfer the slurry to water In the thermal reaction kettle, the hydrothermal reaction is carried out for 2h to 10h under stirring to obtain the second suspension; wherein, the setting temperature of the hydrothermal reaction kettle is 170°C to 220°C; C. The second suspension is separated from the solid and liquid to obtain filter cake and filtrate, the filter cake is washed and dried to obtain anhydrous calcium sulfate whiskers. The preparation method adopts a one-step hydrothermal method to prepare anhydrous calcium sulfate whiskers, and the method is simple; at the same time, not only the problem of low purity is avoided, but also the method of high-temperature burning is avoided, and the production cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of whisker preparation, and in particular relates to a method for preparing anhydrous calcium sulfate whisker by a one-step hydrothermal method. Background technique [0002] Calcium sulfate whiskers, also known as gypsum whiskers, have high strength, high modulus, high toughness, high insulation, wear resistance, high temperature resistance, acid and alkali resistance, corrosion resistance, good infrared reflectivity, easy surface treatment, easy to mix with Polymer composite, non-toxic and many other excellent physical, chemical and mechanical properties. As a new functional material, it is widely used as a reinforcing toughener or functional filler in plastics, rubber, adhesives, friction materials, papermaking, asphalt, coatings, paints, lightweight building materials and sealing materials; it can also be used directly as Filter material, thermal insulation material, refractory heat insulation material,...
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IPC IPC(8): C30B7/10C30B29/62C30B29/46
Inventor 乃学瑛吕智慧董亚萍李武
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI