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Salt gypsum crystal transformation activator as well as preparation method and application thereof

A technology of salt gypsum and activator, which is applied in the field of salt gypsum crystal transformation, salt gypsum crystal transformation activator, and preparation field, to achieve the effect of improving crystal transformation effect, increasing activity, and reducing environmental pollution problems

Active Publication Date: 2019-08-23
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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  • Salt gypsum crystal transformation activator as well as preparation method and application thereof
  • Salt gypsum crystal transformation activator as well as preparation method and application thereof
  • Salt gypsum crystal transformation activator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0057] Add 2.5g maleic anhydride and 1.5g triethanolamine to the four-necked bottle, and add 0.1g p-toluenesulfonic acid, slowly raise the temperature to 80°C, the reaction time is 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 acid-thinned starch and stir evenly, heat to 60°C for 0.5h, then add maleic anhydride triethanolamine ester and maleic anhydride mixture, mix well, stir evenly, and synthesize by semi-dry method , placed in an oven at 80°C for 3...

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention relates to a salt gypsum crystal transformation activator. A preparation method of the salt gypsum crystal transformation activator comprises the step of grafting maleic acid triethanolamine ester on acidified starch; and the method specifically comprises the following steps: performing acidolysis on starch; synthesizing maleic acid triethanolamine ester; and grafting the acidified starch to the maleic acid triethanolamine ester by adopting a semi-dry method to prepare the salt gypsum crystal transformation activator. The invention also relates to a method for realizing salt gypsum crystal transformation by utilizing the activator. The activator provided by the invention can directly hydrothermally transform salt gypsum into alpha-type high-strength semi-hydrated gypsum in one step, thereby greatly improving the competitive advantage of salt gypsum series of products, and realizing large-scale and high-valued resource utilization of a by-product salt gypsum.

Description

technical field [0001] The invention relates to an activator, in particular to a salt gypsum crystal transformation activator, a preparation method and a method for realizing salt gypsum crystal transformation by using the crystal transformation activator. Background technique [0002] Salt gypsum is a by-product 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 resource utilization of by-product gypsum such as salt gypsum, save precious 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 to a certain extent, it will cause corrosion to steel bars and affect building safety. Therefore, salt gypsum cannot be used directly as a cement retarder, nor can it be direct...

Claims

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Application Information

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Patent Type & Authority Applications(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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