Preparation method of anhydrous calcium sulfate whisker
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An anhydrous calcium sulfate and whisker technology is applied in the field of preparing anhydrous calcium sulfate whiskers by one-step hydrothermal method, which can solve the problem of high industrial cost and achieve the effects of reducing production cost, simple process and easy operation.
Active Publication Date: 2015-09-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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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 sti...
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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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Abstract
The invention belongs to the technical field of whisker preparation and particularly relates to a method for preparing anhydrous calcium sulfate whisker by a one-step hydrothermal process. The method comprises the following steps: (A) putting gypsum in water to prepare a first suspension, stirring and adding a crystal form controller to form slurry, wherein the liquid-solid mass ratio of the water to gypsum is (5.5-30):1, and the molar ratio of the crystal form controller to gypsum is (0.7-5):1; (B) transferring the slurry into a hydrothermal reaction kettle, and stirring for a hydrothermal reaction for 2-10h to obtain a second suspension, wherein the set temperature of the hydrothermal reaction kettle is 170-220 DEG C; and (C) performing solid-liquid separation on the second suspension to obtain a filter cake and filtrate, washing the filter cake and drying to obtain the anhydrous calcium sulfate whisker. According to the preparation method, the anhydrous calcium sulfate whisker can be prepared by a one-step hydrothermal process, and the method is simple; and meanwhile, the problem of low purity and the use of a high-temperature sintering process are avoided, and the production cost is lowered.
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
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