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A kind of modified magnesium sulfate cement and preparation method thereof

A magnesium sulfate and modification technology, which is applied in the field of modified magnesium sulfate cement and its preparation to achieve the effects of improving the degree of surface etching activation, improving the compressive strength and increasing the surface area

Active Publication Date: 2021-05-14
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 preparation method of modified magnesium sulfate cement

Method used

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  • A kind of modified magnesium sulfate cement and preparation method thereof
  • A kind of modified magnesium sulfate cement and preparation method thereof
  • A kind of modified magnesium sulfate cement and preparation method thereof

Examples

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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 is as follows: (1) weigh concentrated sulfuric acid, superfine fly ash, magnesium oxide and water according to a certain proportion; (2) add concentrated sulfuric acid Prepare a dilute sulfuric acid solution in a certain amount of spare water, then add ultrafine fly ash, and stir to obtain activated modified ultrafine fly ash; (3) Slowly add 10-20% of spare magnesia to the obtained In the mixture, adjust and stir to fully dissolve the active magnesium oxide to obtain a mixture of fly ash and magnesium sulfate solution; (4) Weigh a certain amount of admixture (add the remaining water, stir and dissolve at room temperature, and then add it to the mixture obtained in step (3). In the mixture, continue to add the remaining magnesium oxide, and stir for 30-60 min to obtain a thick magnesium sulfate cement slurry; the magnesium sulfate cement obtained by the present invention has a compressive strength of 66.96 MPa in 28 days, and the operation is simple and the cost is low , easy to realize 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 Patents(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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