A salt gypsum crystal transformation activator, preparation method and application

A salt gypsum and activator technology, applied in the field of salt gypsum crystal transformation, salt gypsum crystal transformation activator, preparation field
CN110156358BActive Publication Date: 2021-04-27HOHAI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HOHAI UNIV
Publication Date
2021-04-27

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Abstract

The invention relates to a salt gypsum crystal transformation activator. The preparation method of the salt gypsum crystal transformation stimulator is to graft maleic anhydride triethanolamine ester on acid-hydrolyzed starch; specifically, it comprises the following steps: acid-hydrolyze starch; synthesize maleic anhydride Acid anhydride triethanolamine ester; the starch after acid hydrolysis is grafted to maleic anhydride triethanolamine ester by semi-dry method to prepare salt gypsum crystal transformation stimulator. It also relates to a method for realizing salt gypsum transformation by utilizing the activator. The activator in the present invention can directly hydrothermally transform salt gypsum into α-type high-strength hemihydrate gypsum in one step, greatly improving the competitive advantage of salt gypsum series products, and realizing the large-scale and high-value resources of by-product salt gypsum use.
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Description

technical field

[0001] The invention relates to an activator, in particular to a salt gypsum transformation activator, a preparation method and a method for realizing the transformation of the salt gypsum crystal form by using the crystal transformation activator. Background technique

[0002] Salt gypsum is a by-product waste residue of the salt industry. my country's annual by-product salt gypsum is 2.6 million tons, ranking first in the world. In order to promote the utilization of by-product gypsum such as salt gypsum and save valuable natural resources.

[0003] Due to the small particle size and low strength of salt gypsum, it is easy to absorb water and impurities, and has a high salt content. If it is directly used as a cement additive or building material product, it will reduce the strength of cement, and will cause corrosion to steel bars to a certain extent, affecting building safety. Therefore, salt gypsum cannot be used directly as a cement retarder, nor can ...

Claims

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