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Modified magnesium sulfate cement and preparation method thereof

A magnesium sulfate, modified technology, applied in the field of modified magnesium sulfate cement and its preparation, to achieve the effect of increasing surface energy, improving the degree of surface etching activation, and increasing the surface area

Active Publication Date: 2019-03-22
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of preparation method of modified magnesium sulfate cement in order to solve the problem of the novel preparation method of modified magnesium sulfate cement

Method used

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  • Modified magnesium sulfate cement and preparation method thereof
  • Modified magnesium sulfate cement and preparation method thereof
  • Modified magnesium sulfate cement and preparation method thereof

Examples

Experimental program
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Effect test

experiment example 1

[0034] Three parts of 10 g ultrafine fly ash (1-5 μm) were weighed and added to 100 mL of 10%, 20% and 30% dilute sulfuric acid solution respectively, stirred at room temperature for 2 h, and then separated by filtration. Aluminum, iron and calcium in the filtrate were measured by ICP, the results are shown in figure 1 ; The obtained solid powder was washed with deionized water to neutrality, dried at 105 °C for 3~5 h, and then characterized by SEM and XRD. The results are shown in figure 2 , 3 ; The specific surface area was measured by low-temperature nitrogen adsorption, and the results were 19, 48 and 28 m 2 / g.

Embodiment 1

[0036](1) Weigh 58.80g of concentrated sulfuric acid, 24.96g of ultrafine fly ash, 126.05g of magnesium oxide and 217.26g of water are used for standby, (2) Add concentrated sulfuric acid to 204.63g of standby water to prepare a 20% dilute sulfuric acid solution, then add ultrafine fly ash, stir at room temperature for 2 hours, and obtain activated modified ultrafine powder Coal ash; (3) Slowly add 15% 18.91g of spare magnesia to the mixture obtained in step (2), adjust the stirring rate to 400 r / min, stir for 1.5 h, and continue stirring for 15 min after the addition is complete to make the active Magnesium oxide is fully dissolved to obtain a mixture of fly ash and magnesium sulfate solution; (4) According to the mass ratio of admixture to active magnesium oxide is 1:100, weigh 1.26g of citric acid and add it to the remaining water, stir and dissolve at room temperature and then add to step (3) In the obtained mixture, stir for 10 minutes to mix well, continue to add the rem...

Embodiment 2

[0038] (1) Weigh 58.80g of concentrated sulfuric acid, 56.19g of ultrafine fly ash, 151.26g of magnesia and 244.44g of water are used for standby, (2) Add concentrated sulfuric acid to 204.63g of standby water to prepare a 20% dilute sulfuric acid solution, then add ultrafine fly ash, stir at room temperature for 2 hours, and obtain activated modified ultrafine fly ash; 3) Slowly add 15% 22.69g of spare magnesia to the mixture obtained in step (2), adjust the stirring rate to 400 r / min, stir for 1.5 h, and continue stirring for 15 min after the addition is complete to make the active Magnesium oxide is fully dissolved to obtain a mixture of fly ash and magnesium sulfate solution; (4) According to the mass ratio of admixture to active magnesium oxide is 1:100, weigh 1.51g of citric acid and add it to the remaining water, stir and dissolve at room temperature, and then add to step (3) In the obtained mixture, stir for 10 minutes to mix well, continue to add the remaining magnesi...

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Abstract

The invention provides a preparation method of modified magnesium sulfate cement. The method comprises the following steps: (1) weighing concentrated sulfuric acid, ultrafine coal ash, magnesium oxideand water according to a certain proportion for later use; (2) adding the concentrated sulfuric acid into a certain amount of water reserve to prepare a dilute sulfuric acid solution, then adding theultrafine coal ash, and stirring to obtain activated modified ultrafine coal ash; (3) slowly adding 10 to 20 percent of magnesium oxide reserve into the mixture obtained in step (2), and regulating and stirring to fully dissolve the active magnesium oxide in order to obtain a mixture of the coal ash and the magnesium sulfate solution; (4) weighing a certain amount of additive, adding the additiveinto the remaining water, stirring at room temperature for dissolving, adding the solution into the mixture obtained in step (3), continually adding the remaining magnesium oxide, and stirring for 30to 60 minutes to obtain pure thick magnesium sulfate cement slurry. The magnesium sulfate cement can be up to 66.96 MPa in compressive strength after 28 days. Moreover, the preparation method is easyto operate, low in cost, and easy for realizing industrialization.

Description

technical field [0001] The invention relates to a magnesium sulfate cement and a preparation method thereof, in particular to a modified magnesium sulfate cement with activated modified ultrafine fly ash as a filler and a preparation method thereof. Background technique [0002] Magnesium-based cement has the advantages of fast setting, high strength, and wear resistance. 2 Emission reduction and recycling of magnesium resources are of great significance. Magnesium-based cement mainly includes magnesium oxyphosphate cement, magnesium oxychloride cement and magnesium oxysulfide cement, among which, magnesium oxysulfide cement has the characteristics of light weight, fast setting, early strength and wear resistance similar to magnesium oxyphosphate cement and magnesium oxychloride cement. However, there are no shortcomings such as magnesium oxychloride cement's return to brine and moisture absorption, poor water resistance, and strong corrosion of chloride ions to steel bars....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/04
CPCC04B9/04
Inventor 方莉周冬冬程芳琴王琪李鑫赵鑫
Owner SHANXI UNIV
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