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Control method for orientated growth of hemi-hydrate gypsum monocrystals

A hemihydrate gypsum, directional growth technology, applied in the field of gypsum, can solve the problems of easy volatilization, environmental pollution, uncontrollable shape, etc.

Active Publication Date: 2016-06-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

This process uses acid (nitric acid or hydrochloric acid) to extract useful substances in phosphogypsum. The acid will corrode the equipment and easily volatilize, causing pollution to the environment.
[0006] The calcium sulfate whiskers prepared by He Hua and Sun Hongjuan are needle-shaped and uncontrollable in shape; the production process is easy to cause pollution to the environment

Method used

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  • Control method for orientated growth of hemi-hydrate gypsum monocrystals
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  • Control method for orientated growth of hemi-hydrate gypsum monocrystals

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with specific examples.

[0015] A. Raw material pretreatment:

[0016] Table 1 has listed numbering as the consumption of various raw materials in 13 embodiment raw material pretreatments of 1~13: determine the add-on of acidity regulator (calcium oxide, calcium carbonate) and water according to the different embodiments of table 1, and After aging for 24 hours, the phosphogypsum raw material is pretreated.

[0017] Table 1 raw material pretreatment (unit: g)

[0018]

[0019]

[0020] B: Preparation of gypsum single crystal

[0021] The processed phosphogypsum obtained in step A is poured into a reaction kettle with a condensing reflux device, an impurity stabilizer is added, and a crystal face selects an adsorbent, and after mixing evenly, a heating reaction is carried out, and an ion motion controller is added to the reaction system at the same time, After the reaction is finishe...

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Abstract

The invention discloses a control method for orientated growth of hemi-hydrate gypsum monocrystals. The control method comprises the following steps: adding an acidity regulating agent into phosphogypsum, adding water, uniformly mixing, aging, then loading into a reactor with a condensation refluxing device, adding an impurity stabilizer and a crystal face selective absorbent, uniformly mixing, performing the heating reaction, adding an ion movement controller into the reaction system, after the reaction is ended, cooling, filtering, and drying solids to obtain morphology-controllable hemi-hydrate gypsum monocrystals. The method has the characteristics of simple process and low cost and is suitable for industrialized production.

Description

technical field [0001] The invention relates to gypsum, in particular to a method for preparing hemihydrate gypsum single crystal which can be used as columnar morphology in construction, plastics, rubber and paint. Background technique [0002] Gypsum is a sulfate mineral with the chemical formula CaSO4·2H2O. Gypsum can be dehydrated to form anhydrite. In nature, they are in a metastable state and can be transformed into each other under certain conditions. The main value of natural gypsum is that it is heated under different temperature conditions, and its calcined products have different characteristics. For example, when natural gypsum is heated to 65-70°C, it begins to dehydrate and becomes hemihydrate gypsum; when heated to 200°C, it gradually dehydrates, and part of the hemihydrate gypsum becomes anhydrous gypsum, but it quickly condenses into dihydrate gypsum when it contacts with water. When heated to 200-300°C, it mainly becomes anhydrous gypsum, which coagulates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/46
CPCC30B7/14C30B29/46
Inventor 董发勤谭宏斌吴传龙何花贺小春
Owner SOUTHWEAT UNIV OF SCI & TECH
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