A method for preparing α-type high-strength gypsum using pelletized flue gas desulfurization gypsum
A high-strength gypsum and desulfurization gypsum technology, which is applied in the field of gypsum material preparation, can solve the problems of inability to participate in the reaction and poor performance of natural gypsum
Inactive Publication Date: 2016-05-25
UNIV OF SCI & TECH BEIJING +2
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Problems solved by technology
Most of the raw materials used in these three methods are natural gypsum, and natural gypsum impurities generally cannot participate in the reaction during hydration, and to a certain extent, the performance of natural gypsum is not as good as that of pellet flue gas desulfurization gypsum.
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[0015] Implementation column 1:
[0016] The composition of the prepared slurry is as follows:
[0017] Unit: wt%
[0018]
[0019] First, according to the composition in the above table, carry out the ingredients, mix, put into the autoclave, put into the oven heated to 140℃, and react for 4 hours;
[0020] Then the slurry is taken out, filtered while it is hot, and placed in a blast drying oven at 55°C, and dried to constant weight to obtain α-type high-strength gypsum block, which is ground in a grinder to obtain α-type high-strength gypsum powder , The obtained α-type high-strength gypsum powder and water are used to prepare a standard consistency, and then poured into a standard test piece. After the slurry is finally set, the α-type high-strength gypsum of the present invention can be obtained.
[0021] Implementation column two:
[0022] The composition of the prepared slurry is as follows:
[0023] Unit: wt%
[0024]
[0025] First, according to the composition in the above table,...
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Abstract
The invention provides a method for preparing alpha-type high-strength gypsum by using pellet flue gas desulfurization gypsum, and belongs to the field of building materials. The method comprises the steps of preparing a slurry with the concentration of 20% by using the specific amount of desulfurization gypsum and a NaCl solution with the concentration of 15%, and adding a composite crystal modifier, the total amount of which is 0.1% of the total amount of the slurry; uniformly stirring, adding the mixed slurry into a high-pressure reaction kettle, heating to be 140 DEG C, keeping the temperature for 4 hours, performing suction filtration and drying to obtain alpha-type high-strength gypsum powder; adjusting the alpha-type high-strength gypsum powder to a standard consistency, initially condensing the gypsum powder for more than 3 minutes at room temperature, and finally condensing the gypsum powder for less than 30 minutes at room temperature to obtain the alpha-type high-strength gypsum which has the whiteness of greater than 82, has higher anti-bending strength and compression resistance, and meets the national standard requirement. The method for preparing the alpha-type high-strength gypsum by using the pellet flue gas desulfurization gypsum is applied to the field of pellet flue gas desulfurization gypsum, breaks through the key technology of resource utilization, and studies on preparation of the alpha-type high-strength gypsum with the high value-added by using the desulfurization gypsum; therefore, a large amount of waste gypsum resource is reutilized, the desulfurization gypsum is completely utilized, the energy is saved and the emission is reduced.
Description
Technical field [0001] The invention belongs to the field of gypsum material preparation, and particularly relates to a method for preparing α-type high-strength gypsum by using pelletized flue gas desulfurized gypsum. Background technique [0002] α-type high-strength gypsum has the characteristics of complete crystal form, large crystal grains and high strength. Foreign practice has shown that α-type high-strength gypsum produced from dihydrate desulfurized gypsum can be used to process self-leveling gypsum floors; special gypsum production is used in the caulking of gypsum board partition walls; it can also be used as a ceiling in construction projects. Improve thermal insulation and sound insulation performance, and enhance living comfort. In addition, α-type high-strength gypsum plaster can also be used as double-layer floors in computer rooms or public buildings with a large flow of people. This kind of floor has high strength. [0003] With the development of industrial te...
Claims
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IPC IPC(8): C04B11/26
Inventor 郭志猛隋延力宋均平刘曙石棋王继全杨芳李静波李琴张优董广乐牟维国
Owner UNIV OF SCI & TECH BEIJING