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Low-carbon cement clinker and preparation method and application thereof

A low-carbon cement clinker and cement clinker technology, applied in the direction of cement production, etc., can solve the problems of unsatisfactory cement strength, impossible large-scale production, difficult control of production conditions, etc., and achieve excellent early strength, low resource load, The effect of reducing coal consumption

Active Publication Date: 2016-06-15
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent application number 201210022401 records that the cement clinker contains 25-30% β-C 2 S; 25-30% α-C 2 S; 28-40% of 4-12% C 4 AF; 4-8% amorphous phase substances, the cement generates a large amount of α-C 2 S to improve the early strength of cement, but the generation conditions are difficult to control
The patent application number 200610045503.6 records the Belite-barium calcium sulphoaluminate cement compounded with barium calcium sulphoaluminate minerals and belite minerals, but due to the limitation of barium sulfate resources, large-scale production is impossible
Another study shows that the 3-day and 28-day strength of cement cannot meet the engineering requirements because of the low hydration activity of Belite minerals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low-carbon cement clinker, in which the content of highly active beta dicalcium silicate is ≥50%, the content of calcium sulfosilicate is 5%-15%, and the content of calcium sulfoaluminate is 15%-25% %.

[0038] The raw materials for preparing cement clinker are silicon-aluminum-containing materials and limestone, and the weight ratio of each raw material is:

[0039] Silicon aluminum materials: 20~35

[0040] Limestone: 50~80

[0041] Industrial tailings: 5~15;

[0042] Wherein: the silicon-aluminum material is one or a mixture of low-grade bauxite, fly ash, red mud, and coal gangue; the industrial tailings contain sulfur, and the sulfur content is SO 3 In total, it is 20% to 58%.

[0043] SiO in the silicon-containing aluminum material 2 The content is between 40% and 60%; Al 2 O 3 The content is between 20% and 50%; Fe 2 O 3 The content is between 0.01% and 10%; the content of MgO is between 0.01% and 5%, and the above content refers to weight percentage; the weight percentag...

Embodiment 2

[0051] Optimized on the basis of Example 1.

[0052] 1. First select raw materials:

[0053] Low-grade bauxite: SiO 2 , Al 2 O 3 And Fe 2 O 3 The weight percentages are 27.6%, 43.1% and 7.81% respectively;

[0054] Limestone: CaO weight percentage is 50%;

[0055] Industrial tailings: A mixture of industrial tailings A and industrial tailings B at a weight ratio of 5:1.

[0056] 2. After selecting the raw materials, prepare according to the following weight (%):

[0057] Low-grade bauxite: 22

[0058] Limestone: 70

[0059] Industrial tailings: 8

[0060] 3. After the raw materials are selected, the process steps are:

[0061] First, the raw materials are uniformly mixed and ground to a particle size of 0.08 mm square hole sieve remaining 10%, and then calcined at a temperature of 1280° C. for 20 minutes, and the cement clinker of the present invention is obtained after cooling.

[0062] 4. Preparation of high-strength cement

[0063] Add 0.01% to 10% natural gypsum and 0.01% to 10% limestone ...

Embodiment 3

[0066] Optimized on the basis of Example 1.

[0067] 1. First select raw materials:

[0068] Low-grade bauxite: SiO 2 , Al 2 O 3 And Fe 2 O 3 The weight percentage is 30%, 35% and 5% respectively;

[0069] Limestone: 53% by weight of CaO;

[0070] Industrial tailings: A mixture of industrial tailings A and B.

[0071] 2. After selecting the raw materials, prepare according to the following weight (%):

[0072] Low-grade bauxite: 24

[0073] Limestone: 65

[0074] Industrial tailings: 11

[0075] 3. After the raw materials are selected, the process steps are:

[0076] First, the raw materials are uniformly mixed and ground to a particle size of 0.08 mm square hole sieve remaining 12%, and then calcined at a temperature of 1300°C for 18 minutes, and the cement clinker of the present invention is obtained after cooling.

[0077] The prepared cement has a 6-hour compressive strength of 7 MPa, a 1-day compressive strength of 16 MPa, a 3-day compressive strength of 28 MPa, a 7-day compressive stren...

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Abstract

The invention discloses low-carbon cement clinker and a preparation method and application thereof.Raw materials for preparing the cement clinker are a silicon-aluminum containing material, limestone and industrial tailings, and the silicon-aluminum containing material is one of or a mixture of low-grade alumina, fly ash, red mud and gangue.The preparation method includes: well mixing the raw materials, and grinding, wherein a requirement on grain diameter after grinding is that screen residue of a 0.08-mm square-hole screen is less than 15%; calcining the raw materials after being ground at calcining temperature of 1150-1350 DEG C for 10-40 min, and cooling to obtain the low-carbon cement clinker.Content of high-activity beta type dicalcium silicate is greater than or equal to 50%, content of calcium sulfosilicate is 5-15%, and content of calcium sulfoaluminate is 15-25%.A finished cement product can be prepared by adding 0.01-10% of gypsum and 0.01-10% of limestone into the cement clinker.According to existing national detection standards, standard mortar of the cement is higher than 30 MPa in 3-day compressive strength and is 60+ / -5 MPa in 28-day compressive strength.

Description

Technical field [0001] The invention relates to the technical field of preparing low-carbon cement clinker. It specifically relates to low-carbon cement clinker and its preparation method and application. The cement clinker is made of highly active β-type dicalcium silicate (β-C 2 S), calcium sulfosilicate And calcium sulfoaluminate Ecological cement clinker is the main mineral. Background technique [0002] The raw materials for the production of traditional Portland cement are mainly lime, clay and other silica, aluminum and iron calibration raw materials. The main mineral component of cement clinker is tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), tricalcium aluminate (C 3 A) and tetracalcium iron aluminate (C 4 AF). Generally, tricalcium silicate accounts for 60 to 70% of the mineral composition, dicalcium silicate accounts for 15 to 25%, tricalcium aluminate accounts for 5 to 10%, and tetracalcium aluminate aluminate accounts for 10 to 15%. Traditional Portlan...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/26C04B7/44C04B7/52
CPCC04B7/24C04B7/26C04B7/44C04B7/52Y02P40/10
Inventor 刘艳军郑永超郑云生陈玉
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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