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Method for preparing calcium ferroaluminates

A technology of calcium aluminate ferrite and gel method, which is applied in the fields of chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of difficult control of the reaction, harsh requirements for polymer carriers, high synthesis temperature, etc., and achieve easy and efficient reaction process. Consistent chemical composition and simple preparation process

Inactive Publication Date: 2013-02-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of the traditional solid-state sintering method, such as high synthesis temperature and uneasy control of the reaction, and strive to make breakthroughs in the performance of the synthesized products, various chemical methods have begun to be applied to the preparation of calcium aluminoferrite, such as the use of simple molecular long-chain organic compounds Calcium aluminoferrite was prepared at 700°C by the solution-polymer method for the polymer carrier, but this method has strict requirements on the polymer carrier used

Method used

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Examples

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Embodiment 1

[0014] A preparation method of calcium aluminum ferrite, the method is a sol-gel method, specifically comprising the following steps: aluminum nitrate hydrate (Al(NO 3 ) 3 9H 2 O), calcium nitrate hydrate (Ca(NO 3 ) 2 4H 2 O), ferric nitrate hydrate (Fe(NO 3 ) 3 )·9H 2 O) mixing and adding to deionized water, then adding acetylacetone ((CH 3 CO) 2 CH(AcAcH)), stirred for 30min, then added hexamethylenetetramine dissolved in deionized water, stirred for 3h, aluminum nitrate hydrate (Al(NO 3 ) 3 9H 2 O), calcium nitrate hydrate (Ca(NO 3 ) 2 4H 2 O), ferric nitrate hydrate (Fe(NO 3 ) 3 )·9H 2 O), hexamethylenetetramine ((CH 2 ) 6 N 4 ), acetylacetone ((CH 3 CO) 2 The weight ratio of CH(AcAcH)) and deionized water is 1:1.26:1.08:0.47:0.12:6, all of which are analytically pure chemical reagents. Control the temperature at 60°C, stir fully for 12 hours until a transparent sol is formed, place the sol in a water bath, control the temperature of the water bath at...

Embodiment 2

[0016] A preparation method of calcium aluminum ferrite, the method is a sol-gel method, specifically comprising the following steps: aluminum nitrate hydrate (Al(NO 3 ) 3 9H 2 O), calcium nitrate hydrate (Ca(NO 3 ) 2 4H 2 O), ferric nitrate hydrate (Fe(NO 3 ) 3 )·9H 2 O), hexamethylenetetramine ((CH 2 ) 6 N 4 ), acetylacetone ((CH 3 CO) 2 CH(AcAcH)) and deionized water are mixed in a weight ratio of 1:1.26:1.08:0.2:0.08:5, aluminum nitrate hydrate, calcium nitrate hydrate, iron nitrate hydrate, hexamethylenetetramine, acetylacetone All are analytical pure chemical reagents, control the reaction temperature at 70°C, stir for 12 hours until a transparent sol is formed, put the sol in a water bath, control the temperature of the water bath at 70°C, and age for 6 days to form a gel. The obtained gel is dried Place it in a high-temperature cracking furnace for heat treatment, control the temperature at 750°C, burn for 4 hours, and finally cool slowly to room temperatur...

Embodiment 3

[0018] A preparation method of calcium aluminum ferrite, the method is a sol-gel method, specifically comprising the following steps: aluminum nitrate hydrate (Al(NO 3 ) 3 9H 2 O), calcium nitrate hydrate (Ca(NO 3 ) 2 4H 2 O), ferric nitrate hydrate (Fe(NO 3 ) 3 )·9H 2 O), hexamethylenetetramine ((CH 2 ) 6 N 4 ), acetylacetone ((CH 3 CO) 2 CH(AcAcH)) and deionized water are mixed in a weight ratio of 1:1.26:1.08:0.6:0.16:10, aluminum nitrate hydrate, calcium nitrate hydrate, iron nitrate hydrate, hexamethylenetetramine, acetylacetone All are analytically pure chemical reagents, control the reaction temperature at 70°C, stir for 10 hours until a transparent sol is formed, put the sol in a water bath, control the temperature of the water bath at 70°C, and age for 3 days to form a gel. The obtained gel is dried Place it in a high-temperature cracking furnace for heat treatment, control the temperature at 800°C, burn for 2 hours, and finally cool slowly to room tempera...

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Abstract

The invention relates to a method for preparing calcium ferroaluminates. The method comprises the following steps: proportionally mixing an aluminium nitrate hydrate, a calcium nitrate hydrate, a ferric nitrate hydrate, hexamethylenetetramine, acetylacetone, deionized water and the like uniformly by a sol-gel method, then stirring the mixture at the temperature of 50-70 DEG C to obtain sol, ageing the sol to form gel, carrying out heat treatment on the gel at the temperature of 750-800 DEG C for 2-4 hours and slowly cooling the gel to the room temperature, thus obtaining the calcium ferroaluminates. Compared with the prior art, the method has the following advantages: the preparation process is simple; the reaction process is easy to control; and the product has high uniformity and purity and can be fired at the temperature lower than the temperature in the traditional methods.

Description

technical field [0001] The invention relates to a preparation method of an inorganic material, in particular to a preparation method of calcium aluminum ferrite. Background technique [0002] As one of the main minerals of cement clinker, the synthesis method of calcium aluminate has attracted much attention. It is synthesized by the traditional high-temperature sintering reaction method, and the required reaction temperature is high. If mineralizers are used to reduce the sintering temperature or make certain crystal forms of single mineral crystals stable at room temperature, it will be introduced into the single mineral. other ingredients. In order to overcome the shortcomings of the traditional solid-state sintering method, such as high synthesis temperature and uneasy control of the reaction, and strive to make breakthroughs in the performance of the synthesized products, various chemical methods have begun to be applied to the preparation of calcium aluminoferrite, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
Inventor 王培铭陈红霞刘贤萍
Owner TONGJI UNIV
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