A method for controlling the alite crystal form in Portland cement clinker by gas-solid reaction

A Portland cement, gas-solid reaction technology, applied in the field of building materials, can solve the problems of low early strength of cement, high clinker calcination temperature, influence on the structure of cement concrete, etc., and achieves the effect of high conversion rate and improved performance

Active Publication Date: 2021-02-26
NANJING TECH UNIV
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Problems solved by technology

At present, the cement widely used in construction engineering is traditional portland cement, which can meet the needs of some engineering construction to a certain extent, but at the same time, it also has certain application defects. The calcination temperature of its clinker is relatively high, The early strength of cement is low, and at the same time, the volume shrinkage will form in the later stage of cement hydration, which will cause cracks in the hardened body structure, which will have a great impact on the cement concrete structure.

Method used

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  • A method for controlling the alite crystal form in Portland cement clinker by gas-solid reaction
  • A method for controlling the alite crystal form in Portland cement clinker by gas-solid reaction
  • A method for controlling the alite crystal form in Portland cement clinker by gas-solid reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Portland cement clinker is crushed into particles of about 5 mm to obtain Portland cement clinker particle material;

[0060] (2) Weigh 3 parts of the Portland cement clinker particle material that step (1) obtains, every part 60g, put into respectively in the platinum crucible, be placed in the tube furnace that diameter is 80mm then, with 300ml / min flow into SO 2 Mixed gas with air, where SO 2 The volume concentration is 7%; then the temperature is raised at a rate of 5-10°C per minute, and when the temperature rises to 600°C, it is kept for 30 minutes;

[0061] (3) After the reaction is completed, the temperature is controlled by a program, and the temperature is lowered to room temperature at a rate of 5-10°C / min, and the sample A1 is taken out, ground and reserved for testing.

[0062] Under the same conditions, the Portland cement clinker particle material was subjected to heat treatment without atmosphere to obtain the control sample A0.

[0063] figure ...

Embodiment 2

[0072] (1) Portland cement clinker is crushed into particles of about 5 mm to obtain Portland cement clinker particle material;

[0073] (2) Weigh 3 parts of the Portland cement clinker particle material that step (1) obtains, every part 60g, put into respectively in the platinum crucible, be placed in the tube furnace that diameter is 80mm then, with 300ml / min flow into SO 2 Mixed gas with air, where SO 2 The volume concentration is 7%; then the temperature is raised at a rate of 5-10°C per minute, and when the temperature rises to 800°C, it is kept for 30 minutes;

[0074] (3) After the reaction is completed, the temperature is controlled by a program, and the temperature is lowered to room temperature at a rate of 5-10°C / min, and the sample B1 is taken out, ground and reserved for testing.

[0075] Under the same conditions, the Portland cement clinker particle material was subjected to heat treatment without an atmosphere to obtain a control sample B0.

[0076] Figure...

Embodiment 3

[0084] According to the same preparation steps as in Example 1, the cement clinker was kept at 750°C, 800°C, 850°C, 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1150°C, and 1200°C for 30 minutes.

[0085] The XRD patterns of the obtained samples were obtained by X-ray powder diffraction, and the quantitative calculation was performed using Highscore Plus software. Finally plotted as Figure 7 Trend plot of mineral content versus treatment temperature is shown.

[0086] Such as Figure 7 As shown, it can be found that before 1100 °C, with the increase of temperature, the content of M3-alite decreases continuously, and at the same time, the content of M1-alite and C 2 The content of S has increased. But when the temperature exceeds 1100°C, the content of M1-alite shows an inflection point and begins to decrease, while the content of C 2 The S content has been increasing.

[0087] From this we can see that in SO 2 Under the atmosphere, treatment at a temperature below 1100 °C can ...

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Abstract

The present application discloses a method for controlling the Alite crystal form in Portland cement clinker by gas-solid reaction. The Portland cement clinker is crushed to obtain Portland cement clinker particle material, and then 2 In a mixed gas atmosphere with air, raise the temperature to 600-1100°C, keep it warm for 0.5-2 hours, and cool to room temperature after the reaction. The present invention passes through SO in the process of high temperature heat preservation 2 Mixed gas with air, using SO in the mixed gas 2 It can interact with cement clinker minerals to increase the content of M1 Alite, thereby improving the performance of Portland cement clinker. This method can consume a certain amount of SO compared with the control process of Alite crystal form in traditional Portland cement clinker. 2 gas, for cement and others may produce SO 2 The waste gas company provides a feasible solution, and the Alite crystal form regulated by gas-solid reaction has a higher conversion rate of M1 Alite.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a production method of Portland cement clinker, in particular to a method for regulating the alite crystal form in Portland cement clinker by gas-solid reaction. Background technique [0002] Since entering the 21st century, with the rapid development of industry in developing countries, especially China, the construction industry has made rapid progress. Among them, cement concrete and other cementitious materials are the most widely used materials in construction engineering, and have made immeasurable contributions to the development of the country and the world. In 2018, my country's cement production reached 2.21 billion tons, accounting for 56% of the world's total cement production, ranking first in the world for many years. At present, the cement widely used in construction engineering is traditional portland cement, which can meet the needs of some engineering constructi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/48C04B7/43
CPCC04B7/48C04B7/43C04B7/36C04B7/4415
Inventor 马素花康瑞李伟峰沈晓冬
Owner NANJING TECH UNIV
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