Method for fast preparing polycrystalline tetra calcium aluminoferrite

A technology of polycrystalline iron and alumina, applied in chemical instruments and methods, iron compounds, sustainable manufacturing/processing, etc., can solve the problem of high calcination temperature of solid phase sintering method, unfavorable industrial scale production and application, synthesis It is difficult to guarantee the uniformity of the product and other problems, and achieve the effect of shortening the preparation cycle, overcoming the difficulty of mixing powder raw materials, and improving the synthesis efficiency

Active Publication Date: 2016-01-27
WUHAN UNIV
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Problems solved by technology

The solid-phase sintering method requires high calcination temperature, high energy consumption, and it is difficult to guarantee the uniformity of the synthesized product; while the sol-gel method has a complicated synthesis process and a long preparation cycle, which is not conducive to industrial-scale production and application

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  • Method for fast preparing polycrystalline tetra calcium aluminoferrite
  • Method for fast preparing polycrystalline tetra calcium aluminoferrite
  • Method for fast preparing polycrystalline tetra calcium aluminoferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Purpose: To prepare 20g polycrystalline tetracalcium aluminoferrite

[0046] According to the chemical formula of tetracalcium aluminoferrite 4CaO·Al 2 o 3 · Fe 2 o 3 The calculated CaO content is 46.1580%, Al 2 o 3 The content is 20.9814%, Fe 2 o 3 The content is 32.8606%. According to the mass of tetracalcium aluminoferrite to be prepared is 20g, the content of CaO in the sample is calculated to be 20.0×46.1580%=9.2316g.

[0047] According to the mass conservation of Ca element, the required analytically pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 The mass of O is 9.2316×4.2111=38.8752g

[0048] Analytical pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 0.7942 times and 0.8554 times of the mass of O to calculate and analyze pure aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O, analytically pure iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 The masses of O are 38.8752×0.7942=30.8747g, 38.8752×0.8554=33.2538g respectively.

[0049] Analytical ...

Embodiment 2

[0055] Objective: To prepare 12g polycrystalline tetracalcium aluminoferrite

[0056] According to the chemical formula of tetracalcium aluminoferrite 4CaO·Al 2 o 3 · Fe 2 o 3 The calculated CaO content is 46.1580%, Al 2 o 3 The content is 20.9814%, Fe 2 o 3 The content is 32.8606%. According to the mass of tetracalcium aluminoferrite to be prepared is 12g, the content of CaO in the sample is calculated to be 12.0×46.1580%=5.5390g.

[0057] According to the mass conservation of Ca element, the required analytically pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 The mass of O is 5.5390×4.2111=23.3253g.

[0058] Analytical pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 0.7942 times and 0.8554 times of the mass of O to calculate and analyze pure aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O, analytically pure iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 The masses of O are 23.3253×0.7942=18.5250g and 23.3253×0.8554=19.9525g respectively.

[0059] Analy...

Embodiment 3

[0065] Objective: To prepare 15.6g polycrystalline tetracalcium aluminoferrite

[0066] According to the chemical formula of tetracalcium aluminoferrite 4CaO·Al 2 o 3 · Fe 2 o 3 The calculated CaO content is 46.1580%, Al 2 o 3 The content is 20.9814%, Fe 2 o 3 The content is 32.8606%. According to the mass of tetracalcium aluminoferrite to be prepared is 12g, the content of CaO in the sample is calculated to be 15.6×46.1580%=7.2006g.

[0067] According to the mass conservation of Ca element, the required analytically pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 The mass of O is 7.2006×4.2111=30.3224g.

[0068] Analytical pure calcium nitrate tetrahydrate Ca(NO 3 ) 2 4H 2 0.7942 times and 0.8554 times of the mass of O to calculate and analyze pure aluminum nitrate nonahydrate Al(NO 3 ) 3 9H 2 O, analytically pure iron nitrate nonahydrate Fe(NO 3 ) 3 9H 2 The masses of O are 30.3224×0.7942=24.0821g and 30.3224×0.8554=25.9378g respectively.

[0069] Ana...

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Abstract

The invention discloses a method for fast preparing polycrystalline tetra calcium aluminoferrite. The method includes the steps that firstly, raw materials including calcium nitrate terahydrate, aluminum nitrate nonahydrate, iron nitrate nonahydrate and urea are weighed according to the mass ratio of 1:0.7942:0.8554:2.0413-2.1923; secondly, a proper amount of deionized water is added, and dispersion liquid with the concentration ranging from 0.5 mol/L to 0.8 mol/L is prepared and continuously stirred for 1.5 hours to 2 hours till the raw materials are completely dissolved; thirdly, the dispersion liquid is moved into a high temperature stove and heated to 500 DEG C to 510 DEG C in air atmosphere, after the constant temperature is kept for two hours, the dispersion liquid is taken out and grinded into particles with the particle size smaller than or equal to 0.15 mm, and the particles serve as a precursor ready for use; fourthly, the precursor is pressed into a thin piece with the diameter of 35 mm and the thickness smaller than or equal to 5 mm under the pressure of 25 MPa to 30 MPa; finally, the pressed precursor thin piece is heated to 650 DEG C to 950 DEG C at the heating rate of 10 DEG C/min, after the constant temperature is kept for 7 hours, the pressed precursor thin piece is taken out, fast cooled in the air and grinded, and the polycrystalline tetra calcium aluminoferrite with the hydration activity is obtained. The method is small in working procedure number, short in period and high in efficiency, the sintering temperature is 300 DEG C to 600 DEG C lower than the sintering temperature of a traditional method, and the method has the advantages of being fast, efficient and capable of saving energy, and is suitable for industrial large-scale application.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a method for rapidly preparing polycrystalline tetracalcium aluminoferrite. Background technique [0002] Calcium aluminate ferrite is one of the solid solution series of aluminate ferrite, and its chemical formula is Ca 2 (Al x Fe 1-x ) 2 o 5 , when x=0, it is calcium ferrite CaO·Fe 2 o 3 ; When x=1, it is dicalcium aluminate 2CaO·Al 2 o 3 ; When x=0.5, it is tetracalcium aluminoferrite 4CaO·Al 2 o 3 · Fe 2 o 3 . [0003] Tetracalcium aluminoferrite (4CaO·Al 2 o 3 · Fe 2 o 3 , referred to as C 4 AF) is one of the main mineral components of Portland cement clinker. It is the color-developing mineral of Portland cement. Its content has an important influence on the color of Portland cement. Generally, the higher the content, the better the color of Portland cement. deeper. Tetracalcium aluminoferrite has a strong hydration ability, and it can quickly react to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCY02P20/10
Inventor 何真汤盛文李杨蔡新华
Owner WUHAN UNIV
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