Alpha type high-strength gypsum and its preparation method

A technology for high-strength gypsum and gypsum, which is applied in the field of gypsum materials and its preparation, can solve problems such as complicated processes, and achieve the effects of simple process, material saving and good quality.

Active Publication Date: 2007-10-31
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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Problems solved by technology

However, the process of this method is relatively complicated. To generate the slurry of α-type hemihydrate gypsum, the free water must be removed by vacuum or centrifugation first, and the wet material after dehydration should be kept warm and dried immediately.

Method used

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  • Alpha type high-strength gypsum and its preparation method

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Embodiment Construction

[0024] The following structural drawings and embodiments further illustrate the present invention.

[0025] As shown in Figure 1.

[0026] An α-type high-strength gypsum, which is α-type hemihydrate gypsum with a short columnar crystal shape and a dry compressive strength above 25Mpa, which is formed from chemical gypsum and a crystallization agent.

[0027] The concrete production process of above-mentioned gypsum is:

[0028] a. Stirring: mix the crystallization agent into the chemical gypsum at a ratio of 0.1-1%, add 10-15% water and stir evenly;

[0029] b. Compaction: mechanically press the uniformly stirred gypsum material into a spherical or block shape, so that the mediator and the gypsum crystals are evenly and closely contacted and adsorbed on the surface of the gypsum crystals;

[0030] c. Cooking: Put the above-mentioned spherical or massive dihydrate gypsum material obtained by mechanical pressing into an autoclave and autoclave for 1 to 3 hours under saturated ...

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Abstract

The invention provides an alpha type high-strength gypsum produced by chemical gypsum and its making method on the base of present alpha type semi-hydrated high-strength gypsum two producing techniques, aiming at solving the problem of single 'dynamic hydrothermal method' of making chemical gypsum into alpha type semi-hydrated high-strength gypsum: complex techniques, high cost. In said invention, add crystals into chemical gypsum and press forming to accelerate the growing of high-strength short crystals, then get alpha type semi-hydrated high-strength gypsum with dry compression strength more than 25MPa by autoclave method in some technological conditions, and it is characterized by: simple making method, small energy consumption, easy accomplishment, which not only enlarges the application area of chemical gypsum, but also saves resources.

Description

technical field [0001] The invention relates to a gypsum material and a preparation method thereof, in particular to a high-strength gypsum prepared from chemical gypsum and a method thereof, in particular to an alpha-type high-strength gypsum and a preparation method thereof. Background technique [0002] Chemical gypsum, such as desulfurization gypsum, phosphogypsum, lemon gypsum, etc., is a common industrial by-product. Because the content of calcium sulfate dihydrate in chemical gypsum is relatively high, it is a good resource. At present, it is mostly used in the production of β-type gypsum in China. There is no report on the production of α-type high-strength gypsum for construction gypsum. Although it is used to produce α-type high-strength gypsum abroad, they all use the "dynamic hydrothermal method" process, which requires a large investment. [0003] At present, the production method of α-type hemihydrate gypsum mainly has two production process routes, one is call...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/05C04B11/00
Inventor 唐绍林万建东唐修仁
Owner JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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