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Preparation method and application of different crystalline calcium carbonate nano-slurries

A nano-slurry and calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of unsatisfactory use requirements, low early strength, etc., and achieve good application Foreground, improved early strength, superior effect

Active Publication Date: 2021-08-24
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention prepares calcium carbonate nano-slurries of different crystal forms and applies them to cement-based materials, which can significantly improve the early compressive strength of cement, and solve the problem of existing sulphoaluminate cement and ordinary Portland cement. The early strength is low under the condition, which cannot meet the problem of using requirements

Method used

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  • Preparation method and application of different crystalline calcium carbonate nano-slurries
  • Preparation method and application of different crystalline calcium carbonate nano-slurries
  • Preparation method and application of different crystalline calcium carbonate nano-slurries

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preparation example Construction

[0032] The specific embodiment of the present invention provides a kind of preparation method of different crystalline calcium carbonate nano slurry, and this preparation method comprises the steps:

[0033] 1) Prepare the solution: prepare a certain concentration of calcium salt solution and carbonate solution with a solvent, and add a surfactant into the prepared calcium salt solution and carbonate solution. In the same group, the calcium salt solution and the carbonate solution use the same solvent and surfactant, and the generation of different crystal forms of calcium carbonate is controlled by changing the type of solvent and the type and dosage of the surfactant between different groups.

[0034] In an embodiment of the present invention, the surfactant is one of polyvinylpyrrolidone (PVP), citric acid and polyvinyl alcohol (PVA). Preferably, the admixture of surfactant in calcium salt solution and carbonate solution is 1~9g / L (such as 1.5g / L, 2g / L, 2.5g / L, 3g / L, 3.5g / L...

Embodiment 1

[0053] The preparation process of the nano calcium carbonate (pure aragonite type) slurry of the present embodiment is as follows:

[0054] Weigh 11.08g of anhydrous calcium chloride and 10.6g of anhydrous sodium carbonate, stir and dissolve them in the prepared hydroalcoholic solution (the volume ratio of water to ethanol is 2:3) in a water bath at 60°C, and constant volume In a 500mL volumetric flask, prepare 0.2mol / L calcium chloride solution and 0.2mol / L sodium carbonate solution; weigh two parts of 0.5g polyvinyl alcohol (PVA) as surfactant and dissolve in 500ml calcium salt solution respectively And in the carbonate solution of 500ml; The two kinds of solutions that have configured are poured into the colloid mill evenly and slowly at the same rate, make it mix and react rapidly and flow out from the outlet to obtain a mixed slurry. The resulting slurry was then aged for 24 h. Use deionized water to wash and centrifuge several times until the pH value of its supernatant...

Embodiment 2

[0060] The preparation process of the nano calcium carbonate (aragonite, calcite mixed crystal form) slurry of the present embodiment is as follows:

[0061] Weigh 11.08g of anhydrous calcium chloride and 10.6g of anhydrous sodium carbonate, stir and dissolve them in the prepared hydroalcoholic solution (the volume ratio of water to ethanol is 2:3) in a water bath at 60°C, and constant volume In a 500mL volumetric flask, prepare 0.2mol / L calcium chloride solution and 0.2mol / L sodium carbonate solution; weigh two parts of 0.75g polyvinyl alcohol (PVA) as surfactant and dissolve in 500ml calcium salt solution respectively And in the carbonate solution of 500ml; The two kinds of solutions that have configured are poured into the colloid mill evenly and slowly at the same rate, make it mix and react rapidly and flow out from the outlet to obtain a mixed slurry. The resulting slurry was then aged for 24 h. , using deionized water to wash and centrifuge several times until the pH v...

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Abstract

The present invention provides a preparation method and application thereof of calcium carbonate nano-slurries of different crystal forms. The preparation method comprises the following steps: preparing a calcium salt solution and a carbonate solution with a solvent, and adding a surfactant into the prepared solution; Slowly and uniformly pour the prepared calcium salt solution and carbonate solution into the reactor at the same rate to react quickly to obtain a mixed slurry; after standing and aging the mixed slurry for 18-36 hours, use deionized water to wash and centrifuge until the pH of the mixed slurry is neutral properties, to obtain calcium carbonate nano-slurries of different crystal forms. The calcium carbonate nano-slurries of different crystal forms prepared by the present invention are added to cement-based materials as early strength agents, which can significantly improve the early strength of cement. Compared with the early strength of cement without adding this nano-slurry, adding aragonite, After calcite is mixed with crystalline nano-slurry, the 1d compressive strength of ordinary Portland cement can be increased by as much as 30%.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing calcium carbonate nano-slurries of different crystal forms, and the application of the calcium carbonate nano-slurries as early strength agents in different cement-based materials. Background technique [0002] Ordinary Portland cement has a lower cost than special cement, and has a wide range of raw materials, so it has the possibility of wide application. However, in emergency repair and reinforcement projects or prefabricated components, higher early strength is often required. Cement early strength agent can accelerate the hydration rate of cement and promote the development of early compressive strength, but it often leads to the phenomenon of shrinkage in the middle and late compressive strength. [0003] The mineral composition of sulfoaluminate cement clinker mainly includes anhydrous calcium sulfoaluminate (C4A3S), dicalcium silicate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C04B22/10
CPCC01F11/181C01P2002/72C01P2004/03C04B22/10
Inventor 李海艳刘智豪王金凯侯沛然曹凤仙王松先郭文豪李九戌管学茂
Owner HENAN POLYTECHNIC UNIV
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