A kind of high-strength Portland cement clinker and its preparation method

A Portland cement, high-strength technology, applied in clinker production, cement production, etc., can solve the problems of low S content and unoptimized cement clinker mineral content, and achieve the effect of reducing carbon emissions and strengthening early strength

Active Publication Date: 2014-10-29
NANJING TECH UNIV
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  • Application Information

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Problems solved by technology

[0005] The inventor's patent "Secondary Synthesis Method of Calcium Sulphoaluminate in Portland Cement Clinker" (CN101717209A) proposes to introduce sulphoaluminate into Portland cement clinker by secondary synthesis without using mineralizers Calcium; there is no optimization of the mineral content of the cement clinker in this method, C 3 The S content is not high, only a synthetic idea is proposed, and there is no further analysis of the obtained product (strength performance, mineral composition, etc.)

Method used

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  • A kind of high-strength Portland cement clinker and its preparation method
  • A kind of high-strength Portland cement clinker and its preparation method
  • A kind of high-strength Portland cement clinker and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Use industrial raw materials (see Table 1) for batching.

[0037] Composition analysis of table 1 raw material, XRF analysis result (%)

[0038]

[0039] Add gypsum (CaSO 4 2H 2 O), prepared raw meal. The prepared raw material is pressed and calcined, and the temperature is raised to 900°C at a rate of 10°C / min, kept at a temperature of 40 minutes, and then heated at a rate of 5°C / min to a firing temperature of 1500°C, kept at a temperature of 60 minutes, and fired The clinker was cooled to room temperature in the air at a speed of 70°C / min, and blank samples of A and B were obtained. The cooled clinker was heated at 10°C / min to 1230°C for 60 minutes, and then cooled to room temperature at 80°C / min to obtain samples after treatment of A and B.

[0040] The XRD spectrum of the clinker is attached figure 1 Shown: where C 4 A 3 $ is calcium sulfoaluminate, qualitative analysis shows that calcium sulfoaluminate minerals exist in the sample, other cement clinker mi...

Embodiment 2

[0047] Use industrial raw materials (see Table 4) for batching.

[0048] Table 4. Composition analysis of raw materials, XRF analysis results (%)

[0049]

[0050] Table 5. Ratio of ingredients (%)

[0051]

[0052] Add gypsum (CaSO 4 2H 2 O), the raw meal is prepared, and the proportion of ingredients is shown in Table 5. The prepared raw material is pressed and calcined, and the temperature is raised to 1000°C at a rate of 30°C / min, kept at a temperature of 30 minutes, and then heated at a rate of 10°C / min to a firing temperature of 1400°C, kept at a temperature of 30 minutes, and fired The clinker is cooled to room temperature (15-40°C) in the air at a speed of 90°C / min. Heat the cooled clinker at 30°C / min to 1290°C for 5 minutes, then cool to room temperature at 50°C / min. The mineral content of the fired clinker was calculated by Rietveld full-spectrum fitting, and the results are shown in Table 6. In the test, a silicate clinker sample normally produced by a c...

Embodiment 3

[0061] Use industrial limestone, fly ash and sandstone for experiments. Its components are shown in Table 9:

[0062] Table 9 Analysis of each component of raw materials (%)

[0063]

[0064] The dry basis ratio of each raw material is limestone: 82.92%, fly ash: 12.38%, sandstone: 5.51%. Add CaSO with a mass fraction of 8.3% 4 2H 2 O. The prepared raw material is pressed and calcined, and the temperature is raised to 950°C at a rate of 25°C / min, kept for 30 minutes, and then heated to the firing temperature Ts at a rate of 10°C / min, the calcining time is ts, and then moved quickly The sample arrives at the T1 section of constant temperature, and after heat preservation treatment (holding time t1), it is moved to the T2 section for heat preservation (holding time t2). After the processed sample is taken out, it is cooled at 80°C / min. The temperature of the tube furnace was calibrated with a Ferro temperature measuring ring (±5°C). Mineral quantification was performed ...

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Abstract

The invention relates to high-strength silicate cement clinker and a preparation method thereof. The mineral constituents of the clinker are as follows in percentage by weight: alite (50%-75% of tricalcium silicate C3S), belite (2%-25% of dicalcium silicate C2S), tricalcium aluminate (2%-10% of C3A), tetra calcium aluminoferrite (2%-8% of C4AF), calcium sulphoaluminate (2%-9% of C4A3S), free calcium oxide (0.5%-3% of f-CaO), periclase (1%-6% of f-MgO) and bassanite (0-3% of CS). 1-day stand mortar strength, 3-day stand mortar strength and 28-day standard mortar strength are respectively 25MPa-35MPa, 38MPa-45MPa and 65MPa-75MPa; the clinker has certain expansibility after being hydrated; and the hydrated sample volume porosity is 10%-12%. The preparation method of the clinker comprises the following steps of: introducing gypsum to raw materials; improving content of SO3 in the materials to form calcium sulphoaluminate; properly improving aluminum ratio in dosing to control liquid phase amount in the clinker, and reducing the content of iron in the clinker; and sintering the materials into clinker under 1400 DEG C to 1500 DEG C, cooling and thermally treating the cooled clinker, quenching after the treatment is finished, wherein the clinker with high alite content is mainly formed in the first sintering process, and the secondary formation of calcium sulphoaluminate is promoted by the thermal treatment.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, in particular to a high-strength Portland cement clinker containing sulfur-aluminate calcium developed in strength matching and a preparation method thereof. Background technique [0002] Portland cement clinker (Portland cement clinker) is mainly composed of alite (tricalcium silicate, C 3 S, Alite), Belite (dicalcium silicate, C 2 S, Beilite), C 3 A (tricalcium aluminate) and C 4 AF (tetracalcium aluminoferrite) composition. C 3 S is the main strength mineral in clinker, and its content and quality determine the performance of cement. Oxide is abbreviated as: C=CaO, S=SiO 2 、A=Al 2 o 3 、F=Fe 2 o 3 , $=SO 3 . [0003] Calcium sulfoaluminate (C 4 A 3 $, Ye’elimite) is a good early-strength mineral. Lafarge achieves low CO by introducing calcium sulfoaluminate to belite clinker 2 Discharged Belite calcium sulfoaluminate cement (BSCAF, CN102256911A). However, be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/04C04B7/36
CPCY02P40/121
Inventor 沈晓冬黎学润许捷许文龙张宇周妍
Owner NANJING TECH UNIV
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