Method for preparing tricalcium aluminate by aid of spark plasma sintering techniques

A discharge plasma, tricalcium aluminate technology, applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, sustainable manufacturing/processing, etc., can solve the impact of formation, reduce calcination temperature, time It can reduce energy consumption and cost, irregular particle morphology and consistent chemical composition.

Active Publication Date: 2016-05-25
WUHAN UNIV
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  • Description
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Problems solved by technology

The raw materials used in the solid phase sintering method are mainly CaO, Al 2 o 3 , Ca(OH) 2 , Al(OH) 3 Such as powder, there are disadvantages such as uneven mixing of reactants, high calcination temperature, long time, high energy consumption, and difficult ion diffusion. At least three times of repeated grinding and calcination are required to ensure that the product has a high purity.
The sol-gel method aims at the above shortcomings of the solid-state sintering method, using calcium nitrate Ca(NO 3 ) 2 4H 2 O, aluminum nitrate Al(NO 3 ) 3 9H 2 O and other hydrated nitrates are used as raw materials, supplemented with hexamethylenetetramine, ethylene glycol, polyethylene glycol and other chemical reagents to make a solution, so that the dispersion and mixing of raw materials reaches the molecular level, and after standing and aging, the high temperature It is made by sintering, which has the advantages of

Method used

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  • Method for preparing tricalcium aluminate by aid of spark plasma sintering techniques
  • Method for preparing tricalcium aluminate by aid of spark plasma sintering techniques
  • Method for preparing tricalcium aluminate by aid of spark plasma sintering techniques

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Objective: To prepare 20.00g of tricalcium aluminate.

[0041] The oxide form 3CaO Al according to the chemical formula of tricalcium aluminate 2 o 3 , the calculated CaO content is 62.27%, Al 2 o 3 The content is 37.73%. According to the mass of tricalcium aluminate to be prepared is 20.00g, the mass of CaO in the sample after sintering is calculated to be 20.00×62.27%=12.45g.

[0042] According to the conservation of Ca element mass, the analytically pure calcium carbonate CaCO is calculated as 1.7847 times the mass of CaO 3 The required amount is 12.45×1.7847=22.22g;

[0043] Analytical Pure Calcium Carbonate CaCO 3 0.3396 times the mass to calculate the required analytically pure γ-phase alumina γ-Al 2 o 3 The mass of is 22.22×0.3396=7.55g.

[0044] Calculation and analysis of pure calcium carbonate CaCO 3 and analytically pure γ-phase activated alumina γ-Al 2 o 3 The total mass of the powder is 22.22+7.55=29.77g, and the required ball mass is calculated...

Embodiment 2

[0049] Purpose: To prepare 15.00 g of tricalcium aluminate.

[0050] The oxide form 3CaO Al according to the chemical formula of tricalcium aluminate 2 o 3 , the calculated CaO content is 62.27%, Al 2 o 3 The content is 37.73%. According to the mass of tricalcium aluminate to be prepared is 15.00g, the mass of CaO in the sample after sintering is calculated to be 15.00×62.27%=9.34g.

[0051] According to the conservation of Ca element mass, the analytically pure calcium carbonate CaCO is calculated as 1.7847 times the mass of CaO 3 The required amount is 9.34×1.7847=16.67g;

[0052] Analytical Pure Calcium Carbonate CaCO 3 0.3396 times the mass to calculate the required analytically pure γ-phase alumina γ-Al 2 o 3 The mass of is 16.67×0.3396=5.66g.

[0053] Calculation and analysis of pure calcium carbonate CaCO 3 and analytically pure γ-phase activated alumina γ-Al 2 o 3 The total mass of 16.67+5.66=22.33g, according to 4 times of the total mass of the powder mate...

Embodiment 3

[0058] Purpose: To prepare 10.00 g of tricalcium aluminate.

[0059] The oxide form 3CaO Al according to the chemical formula of tricalcium aluminate 2 o 3 , the calculated CaO content is 62.27%, Al 2 o 3 The content is 37.73%. According to the mass of tricalcium aluminate to be prepared is 10.00g, the mass of CaO in the sample after sintering is calculated to be 10.00×62.27%=6.23g.

[0060] According to the conservation of Ca element mass, the analytically pure calcium carbonate CaCO is calculated as 1.7847 times the mass of CaO 3 The required amount is 6.23×1.7847=11.12g;

[0061] Analytical Pure Calcium Carbonate CaCO 3 0.3396 times the mass to calculate the required analytically pure γ-phase alumina γ-Al 2 o 3 The mass of is 11.12×0.3396=3.78g.

[0062] Calculation and analysis of pure calcium carbonate CaCO 3 and analytically pure γ-phase activated alumina γ-Al 2 o 3 The total mass of 11.12+3.78=14.90g, according to 4 times the total mass of the powder materia...

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Abstract

The invention relates to a method for preparing tricalcium aluminate by the aid of spark plasma sintering techniques. The method includes analyzing raw materials which are pure calcium carbonate CaCO3 and pure gamma-phase aluminum oxide gamma-Al2O3; carrying out ball-milling on the pure calcium carbonate and the pure gamma-phase aluminum oxide and then controlling the heating rates and the cooling rate of a spark plasma sintering furnace under the conditions of vacuum degrees of (30-50) Pa, pulse ratios (ON/OFF) of (6/1-48/8) and axial pressures of (1-3) kN; fetching samples out of the spark plasma sintering furnace when the temperatures of the samples are reduced and reach (60-90) DEG C and grinding the samples to obtain particles with the sizes smaller than 20 micrometers so as to obtain the tricalcium aluminate. The method is simple and convenient, and the synthesis efficiency is improved by (10-20) times as compared with the traditional method. The method has the advantages of speediness, high efficiency and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing tricalcium aluminate by using a discharge plasma sintering technology. Background technique [0002] The mineral phases in Portland cement clinker are mainly tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. By mass, tricalcium aluminate (3CaO·Al 2 o 3 , referred to as C 3 The content of A) is generally (7-15)%, which is the third largest mineral phase of Portland cement clinker, only slightly higher than tetracalcium aluminoferrite. Although the proportion is small, in the process of clinker calcination, tricalcium aluminate can reduce the melting temperature and viscosity of clinker, which is beneficial to the formation of tricalcium silicate, and is indispensable in the production process of cement industry. and a product of avoidance. [0003] Tricalcium aluminate has the character...

Claims

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Application Information

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IPC IPC(8): C01F7/16C04B7/32
CPCC01F7/164C04B7/32Y02P20/10
Inventor 何真李杨汤盛文蔡新华
Owner WUHAN UNIV
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