Alpha type ultra-high strength gypsum preparation method

An ultra-high-strength, gypsum technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of high pressure, high operational risk, incomplete crystal development, etc., to reduce production costs and energy consumption, high safety factor, Resolve the effects of underdeveloped crystals

Active Publication Date: 2013-03-27
国能朗新明环保科技有限公司
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Problems solved by technology

However, because the desulfurized gypsum particles are relatively small and densely packed, the preparation of k-gypsum by the traditional process will have the disadvantages of relatively high pressure, high operation risk, and incomplete crystal development.

Method used

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  • Alpha type ultra-high strength gypsum preparation method

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preparation example Construction

[0028] Such as figure 1 As shown, the preparation method of α-type ultra-high-strength gypsum according to the embodiment of the present invention includes the following steps:

[0029] a) Dissolving the soluble inorganic salt in water to obtain a saline solution.

[0030] There is no particular limitation on the soluble inorganic salt used as long as it has high solubility. For example, in some examples of the present invention, the soluble inorganic salt may use soluble chloride salt, soluble nitrate salt or a combination thereof. By using such soluble chloride salts, soluble nitrate salts or combinations thereof, the phase transition point of dihydrate gypsum and hemihydrate gypsum can be effectively lowered, and the boiling point of its aqueous solution can be raised.

[0031] As the soluble chloride salt, for example, one or more of commonly used calcium chloride, sodium chloride, potassium chloride, and magnesium chloride can be used.

[0032] As the soluble nitrate, ...

Embodiment 1

[0049] First, mix the NH 4 NO 3 : 2 parts by weight, Cacl 2 : 2 parts by weight and NaNO 3 : 1 part by weight was dissolved in 150 parts by weight of water to obtain a saline solution, and the saline solution was heated to 70°C.

[0050] Next, 100 parts by weight of desulfurized gypsum was added to the above-mentioned saline solution while stirring to obtain a premixed solution.

[0051]After the premix is ​​mixed evenly, add C 4 h 6 o 6 : 0.01 parts by weight, Al 2 (SO 4 ) 3 : 0.2 parts by weight to obtain a reaction liquid.

[0052] Thereafter, the reaction solution was heated to boiling and kept at normal pressure for 3-4 hours to perform crystallization. Finally, the reaction solution after crystal transformation is filtered, washed, and dried to obtain high-purity α-type ultra-high-strength gypsum.

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Abstract

The present invention discloses an alpha type ultra-high strength gypsum preparation method, which comprises the following steps: a) dissolving a soluble inorganic salt in water to obtain an aqueous salt solution; b) adding desulfurized gypsum, natural gypsum or a mixture of desulfurized gypsum and natural gypsum to the aqueous salt solution to obtain a premix solution; c) adding a crystal transformation agent to the premix solution to obtain a reaction solution; and d) heating the reaction solution to 60-100 DEG C, carrying out crystal transformation at a constant temperature under atmospheric pressure, and filtering the reaction liquid after crystal transformation to obtain the alpha type ultra-high strength gypsum. According to the alpha type ultra-high strength gypsum preparation method of the embodiments of the invention, a safety coefficient is high, and energy consumption is low; and the prepared alpha type ultra-high strength gypsum crystal has a uniform short columnar shape, such that the problem of incomplete crystal development in k gypsum preparation by using desulfurized gypsum is solved so as to increase strength. In addition, a process time is shortened, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of building materials, and in particular relates to a preparation method of α-type ultra-high-strength gypsum. Background technique [0002] α-type ultra-high-strength gypsum (also known as K-gypsum) is safe for finishing operations due to its high strength and hardness. Now it has been widely used in the fields of medicine, aviation, ships, automobiles, precision casting, plastics, architectural art and arts and crafts, such as super-hard dental plaster models, super-high-strength model plasters, k-gypsum for casting, ship cable sealing plaster Wait. [0003] The traditional k-gypsum production process is to use natural gypsum to prepare by autoclaving. The pressure required for this process is generally 0.8-1.0 MPa, and the autoclaving time is 8 hours. After the autoclave is completed, it is dried. Therefore, the requirements for production equipment are high and the energy consumption is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
Inventor 周伟徐立范豫马翔
Owner 国能朗新明环保科技有限公司
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