Method for synthesis of tetracalcium aluminoferrite by sol-gel technology

A technology of tetracalcium ferric aluminate and gel method, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of high sintering temperature, low product purity, high energy consumption, etc., to overcome calcination high temperature effect

Inactive Publication Date: 2013-01-30
TONGJI UNIV
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  • Claims
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Problems solved by technology

With the solid-phase method, since the raw materials are all mixed in solid powder form, the reactants may be mixed unevenly, and it is difficult to diffuse du

Method used

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  • Method for synthesis of tetracalcium aluminoferrite by sol-gel technology

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Embodiment 1

[0029] Embodiment 1, a kind of method for synthesizing tetracalcium aluminoferrite by sol-gel method, the weight ratio of its raw material is: Ca(NO 3 ) 2 4H 2 O 100, Al(NO 3 ) 3 9H 2 O 79.4, Fe(NO 3 ) 3 9H 2 O 85.6, citric acid monohydrate 178.0, ethylene glycol 105.1 and water 600. The following synthesis method was adopted: on a magnetic stirrer, heated at 50°C, Ca(NO 3 ) 2 4H 2 O, Al(NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 Add O into water respectively, heat and stir for 30 minutes until completely dissolved; add white citric acid monohydrate particles into the mixture of three nitrate solutions, heat and stir for 50 minutes to obtain a clear light yellow solution; add ethylene glycol to light yellow nitric acid In the salt-citric acid chelate solution, an esterification reaction occurs, and the reaction is carried out at a temperature of 50° C. for 40 minutes; the temperature of the magnetic stirrer is adjusted to 80° C., and aged for 6 hours to obtain a viscous...

Embodiment 2

[0030] Embodiment 2, a kind of method for synthesizing tetracalcium aluminoferrite by sol-gel method, the weight ratio of its raw material is: Ca(NO 3 ) 2 4H 2 O 100, Al(NO 3 ) 3 9H 2 O 79.4, Fe(NO 3 ) 3 9H 2 O 85.6, citric acid monohydrate 178.0, ethylene glycol 160 and water 800. The following synthesis method was adopted: on a magnetic stirrer, heated at 55°C, Ca(NO 3 ) 2 4H 2 O, Al(NO 3 )3 9H 2 O, Fe(NO 3 ) 3 9H 2 Add O into water respectively, heat and stir for 25 minutes until completely dissolved; add white citric acid monohydrate granules to the mixture of three nitrate solutions, heat and stir for 45 minutes to obtain a clear light yellow solution; add ethylene glycol to light yellow nitric acid In the salt-citric acid chelate solution, an esterification reaction occurs, and react at a temperature of 55°C for 35min; adjust the temperature of the magnetic stirrer to 83°C, and age for 5h to obtain a viscous wet gel; put the wet gel at a temperature of Dr...

Embodiment 3

[0031] Embodiment 3, a kind of method for synthesizing tetracalcium aluminoferrite by sol-gel method, the weight ratio of its raw material is: Ca(NO 3 ) 2 4H 2 O 100, Al(NO 3 ) 3 9H 2 O 79.4, Fe(NO 3 ) 3 9H 2 O 85.6, citric acid monohydrate 178.0, ethylene glycol 210.2 and water 1000. The following synthesis method was adopted: on a magnetic stirrer, heated at 60°C, Ca(NO 3 ) 2 4H 2 O, Al(NO 3 ) 3 9H 2 O, Fe(NO 3 ) 3 9H 2 Add O into water respectively, heat and stir for 20 minutes until completely dissolved; add white citric acid monohydrate particles into the mixture of three nitrate solutions, heat and stir for 40 minutes to obtain a clear light yellow solution; add ethylene glycol to light yellow nitric acid In the salt-citric acid chelate solution, an esterification reaction occurs, and react at a temperature of 60°C for 30min; adjust the temperature of the magnetic stirrer to 85°C, and age for 4h to obtain a viscous wet gel; put the wet gel at a temperatur...

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Abstract

Belonging to the technical field of building materials, the invention specifically relates to a method for synthesis of tetracalcium aluminoferrite by a sol-gel technology. The raw materials used by the synthesis method include: calcium nitrate tetrahydrate, aluminum nitrate nonahydrate, iron nitrate nonahydrate, citric acid monohydrate, ethylene glycol and water. The specific synthesis steps consist of: dissolving three inorganic salts of certain stoichiometric ratio in deionized water and mixing them uniformly, adding citric acid to prepare a light yellow metal-citric acid chelate solution, then adding ethylene glycol to undergo an esterification reaction, subjecting the obtained sol to aging under complete stirring at 80DEG C so as to obtain sticky wet gel, then further drying it for 24h at 150DEG C to obtain dry gel, and grinding and calcining the dry gel so as to obtain a tetracalcium aluminoferrite monomineral. The tetracalcium aluminoferrite powder prepared by the sol-gel technology has the characteristics of high purity, superfineness, and easy sintering, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for synthesizing tetracalcium aluminoferrite by a sol-gel method. Background technique [0002] Cement clinker is mainly a solid solution composed of minerals such as tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. Although tetracalcium aluminoferrite accounts for a small proportion of these four minerals, it can reduce the melting temperature of the clinker and melt into liquid (the liquid that appears in the process of calcining clinker) during the calcination of clinker , collectively referred to as the liquid phase) viscosity is conducive to the generation of tricalcium silicate. [0003] Tetracalcium aluminoferrite is an important part of Portland cement clinker, its content is generally 10%~18% (mass fraction), and its hydration rate is between tricalcium aluminate and tricalcium silicate in the...

Claims

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Application Information

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IPC IPC(8): C01G49/00
Inventor 孙振平李奇俞洋
Owner TONGJI UNIV
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