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Method of preparing high-purity tricalcium aluminate quickly

A tricalcium aluminate, high-purity technology, applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, sustainable manufacturing/processing, etc., can solve the problem of high energy consumption and high firing temperature , long firing cycle and other problems, to achieve the effect of reducing preparation conditions, good synthesis effect, and improving long cycle

Inactive Publication Date: 2019-08-27
UNIV OF JINAN
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Problems solved by technology

[0005] High-purity tricalcium aluminate is the basis for single ore hydration research. Tricalcium aluminate is usually fired in the solid phase method in the laboratory. This method has high firing temperature and high energy consumption. In order to reduce the firing temperature, it can be introduced Mineralizer, but the introduction of impurity elements; and its long firing cycle, at least three times of repeated grinding and calcination to ensure the purity of the product

Method used

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  • Method of preparing high-purity tricalcium aluminate quickly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Purpose: To prepare 15.00g of tricalcium aluminate

[0035] 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 of CaO is 37.73%. According to 15.00g of the sample to be prepared, the calculated content of CaO in the sample should be 9.34g. According to the conservation of calcium element mass, the calculated amount of used analytically pure calcium nitrate tetrahydrate is 39.32g.

[0036] Press N(Ca(NO 3 ) 2 4H 2 O):N(Al(OH) 3 Colloid) = 3:1, weighed 4.33g of aluminum hydroxide; according to the calcium ion concentration of 1.9mol / L, the mass of deionized water was calculated to be 89.47g, and the corresponding mass of deionized water was weighed.

[0037] The calcium nitrate tetrahydrate that weighs, aluminum hydroxide and deionized water are packed in 300ml Erlenmeyer flask, put into magnetic stirrer, be fixed on the magnetic stirrer and heat, Erlenmeyer flask is se...

Embodiment 2

[0042] Purpose: To prepare 20.00g of tricalcium aluminate

[0043] 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 of CaO is 37.73%. According to 20.00g of the sample to be prepared, the calculated content of CaO in the sample should be 12.45g. According to the conservation of calcium element mass, the calculated amount of used analytically pure calcium nitrate tetrahydrate is 52.41g.

[0044] Press N(Ca(NO 3 ) 2 4H 2O):N(Al(OH) 3 colloid)=3:1, weighed 5.77g aluminum hydroxide; according to the calcium ion concentration of 1.8mol / L, the calculated mass of deionized water was 122.22g, and weighed the corresponding mass of deionized water.

[0045] The calcium nitrate tetrahydrate that weighs, aluminum hydroxide and deionized water are packed in 300ml Erlenmeyer flask, put into magnetic stirrer, be fixed on the magnetic stirrer and heat, Erlenmeyer flask is sealed with plas...

Embodiment 3

[0050] Purpose: To prepare 25.00g of tricalcium aluminate

[0051] 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 of CaO is 37.73%. According to 25.00g of the sample to be prepared, the calculated content of CaO in the sample should be 15.57g. According to the conservation of calcium element mass, the calculated amount of used analytically pure calcium nitrate tetrahydrate is 65.55g.

[0052] Press N(Ca(NO 3 ) 2 4H 2 O):N(Al(OH) 3 colloid)=3:1, weighed 7.22g of aluminum hydroxide; according to the calcium ion concentration of 2.0mol / L, the calculated mass of deionized water was 140g, and weighed the corresponding mass of deionized water.

[0053] The calcium nitrate tetrahydrate that weighs, aluminum hydroxide and deionized water are packed in 300ml Erlenmeyer flask, put into magnetic stirrer, be fixed on the magnetic stirrer and heat, Erlenmeyer flask is sealed with pla...

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Abstract

The invention relates to a method of preparing high-purity tricalcium aluminate quickly and is mainly applied to the field of building materials. The method comprises the following steps: by taking analytically pure calcium nitrate tetrahydrate and aluminum hydroxide as raw materials, adding a proper amount of deionized water to prepare a homogeneous solution; then fixing the homogeneous solutionto a magnetic stirrer to be stirred for 10-20 min under the conditions that the temperature is 60-80 DEG C and the rotating speed is 170-200 r / min, adjusting the PH value with ammonia water in the process, wherein the PH value is in a range of 10.5-11.5; placing a sol which is formed in a blowing drying box to be dried for 6-8 h at 60-80 DEG C, ageing and drying the mixture and grinding the mixture till the grain size is 0.075 mm, and pressing the mixture to 4 mm sheets under the pressure of 20 MPa; putting the sheets in a crucible, heating the crucible by an electric furnace, carrying out programmed temperature heating, insulating the mixture for 4 h at 1100 DEG C, and taking out a sample and quenching the sample to prepare high-purity C3A. The method is easily available in use material,simple to operate, few in synthetic process, short in preparation period, low in calcining temperature and low in energy consumption, and has the advantages of being energy-saving and efficient and the like.

Description

technical field [0001] This article relates to a method for rapidly preparing high-purity tricalcium aluminate, which belongs to the field of building materials. Background technique [0002] Social and economic construction is inseparable from infrastructure construction, and cement concrete is the raw material for many important projects. The rapid development of my country's infrastructure construction is recognized as a major energy and resource consumer. At the same time, the cement industry has prominent problems of high energy consumption and high pollution. Sustainable development requires that the cement industry must take "high efficiency and energy saving" as its development goal. In this regard, how to prepare and The use of more efficient cement materials has become an urgent problem to be solved. [0003] Due to the complex composition of cement and many unknown factors, the research on cement hydration usually takes a single ore as a breakthrough point. Trica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/16
CPCC01F7/164C01P2006/80Y02P20/10
Inventor 周宗辉刘永毅任尊超
Owner UNIV OF JINAN
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