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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

Active Publication Date: 2021-04-27
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystal form of desulfurized gypsum and phosphogypsum is more regular than that of salt gypsum, and the crystal grains are coarser. The impurities do not contain chloride salts. The law of hydrothermal crystal transformation is similar to that of natural gypsum; There are still great difficulties in transforming crystals into α-type high-strength hemihydrate gypsum, and relevant research is urgently needed to solve this technical problem

Method used

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  • A salt gypsum crystal transformation activator, preparation method and application
  • A salt gypsum crystal transformation activator, preparation method and application
  • A salt gypsum crystal transformation activator, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 50g of industrial-grade common cornstarch, add 75g of water to prepare starch milk, add 2g of 98% concentrated sulfuric acid, then heat to 50°C in a water bath, stop heating after 2 hours, cool to room temperature without neutralization, retain residual sulfuric acid, use vacuum pumping After filtering, washing and drying, acid-hydrolyzed starch can be obtained and stored at low temperature.

[0057] Add 2.5g maleic anhydride and 1.5g triethanolamine to the four-necked flask, and add 0.1g p-toluenesulfonic acid, slowly heat up to 80°C, reaction time 6h, and cool down to obtain maleic anhydride triethanolamine ester and maleic anhydride mixture.

[0058] Dissolve 0.2g of sodium carbonate in 5g of water, add acidolyzed starch, stir evenly, heat to 60°C for 0.5h, add maleic anhydride triethanolamine ester and maleic anhydride mixture, mix well, stir evenly, and synthesize by semi-dry method , put it in an oven at 80°C for 3 hours, cooled to room temperature, dried and gro...

Embodiment 2

[0061] 40g of technical grade common cornstarch, add 75g of water to prepare starch milk, add 1g of 98% concentrated sulfuric acid, then heat to 45°C in a water bath, stop heating after 1.5h, cool down to room temperature without neutralization, retain residual sulfuric acid, use vacuum After suction filtration, washing and drying, acid hydrolyzed starch can be obtained and stored at low temperature. Add 2g maleic anhydride and 1.7g triethanolamine to the four-necked flask, and add 0.1g p-toluenesulfonic acid, slowly heat up to 82°C, reaction time 5h, and cool down to obtain maleic anhydride triethanolamine ester and maleic anhydride mixture . Dissolve 0.2g of sodium carbonate in 7g of water, add acidolyzed starch, stir evenly, heat to 65°C for 0.5h, add maleic anhydride triethanolamine ester and maleic anhydride mixture, mix well, stir evenly, and synthesize by semi-dry method , put it in an oven at 80°C for 2.5 hours, cooled to room temperature, dried and ground to obtain a...

Embodiment 3

[0064] 45g of industrial grade common cornstarch, add 70g of water to make starch milk, add 1.5g of 98% concentrated sulfuric acid, then heat to 50°C in a water bath, stop heating after 2 hours, cool to room temperature without neutralization, retain residual sulfuric acid, use vacuum After suction filtration, washing and drying, acid hydrolyzed starch can be obtained and stored at low temperature. Add 2.5g maleic anhydride and 1.5g triethanolamine to the four-necked flask, and add 0.1g p-toluenesulfonic acid, slowly heat up to 80°C, reaction time 6h, and cool down to obtain maleic anhydride triethanolamine ester and maleic anhydride mixture. Dissolve 0.2g of sodium carbonate in 5g of water, add acidolyzed starch, stir evenly, heat to 70°C for 0.5h, add maleic anhydride triethanolamine ester and maleic anhydride mixture, mix well, stir evenly, and synthesize by semi-dry method , put it in an oven at 80°C for 3 hours, cooled to room temperature, dried and ground to obtain a sa...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C04B11/032C04B11/024
CPCC04B11/024C04B11/032C04B11/26
Inventor 何辉蒋亚清陈印文范文杰吕文轩
Owner HOHAI UNIV
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