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Method for regulating and controlling alite crystal structure in cement clinker

A crystal structure and cement clinker technology, which is applied in the field of alite crystal structure control in cement clinker, can solve problems such as theoretical research gaps, and achieve the effects of strong universality, increased production costs, and easy operation

Active Publication Date: 2021-02-02
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be applied to the production process of Portland cement clinker, and it is still a blank in theoretical research and actual production that the M3 type Alite crystal structure can be adjusted to M1 type by adding some trace elements.

Method used

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  • Method for regulating and controlling alite crystal structure in cement clinker
  • Method for regulating and controlling alite crystal structure in cement clinker
  • Method for regulating and controlling alite crystal structure in cement clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Using analytically pure CaCO 3 , SiO 2 , Al 2 o 3 , Fe 2 o 3 , MgO and desulfurized gypsum for raw meal configuration, the design clinker mineral composition is C 3 S 63.42%, C 2 S 17.70%, C 3 A 8.6%, C 4 AF 10.28%, design clinker rate value KH=0.91, SM=2.60, IM=1.60. The clinker MgO content is 0.5% in the embodiment 1, SO 3 Incorporated in the form of desulfurized gypsum, SO in clinker 3 The content is 0.36%. As a comparison A1 does not contain magnesium and sulfur in the clinker, as a comparison B contains sulfur in the clinker but does not contain magnesium, as a comparison C contains magnesium but does not contain sulfur in the clinker. The raw material is mixed according to the raw material ratio and mixed evenly, then the mixed raw material is calcined, the temperature is raised at 10°C / min during the calcining stage, the temperature is raised to 1500°C, kept for 1 hour, and then cooled at a cooling rate of 60°C / min to room temperature (generally 15-40...

Embodiment 2

[0057] Using analytically pure CaCO 3 , SiO 2 , Al 2 o 3 , Fe 2 o 3 , MgO and desulfurized gypsum for raw meal configuration, the design clinker mineral composition is C 3 S 63.42%, C 2 S 17.70%, C 3 A 8.6%, C 4 AF 10.28%, design clinker rate value KH=0.91, SM=2.60, IM=1.60. The clinker MgO content is 1.5% in embodiment 2, SO 3 Incorporated in the form of desulfurized gypsum, SO in clinker 3 The content is 1.09. The comparative A2 contains no magnesium and sulfur in the clinker, the comparative D contains magnesium but no sulfur in the clinker, and the comparative E contains sulfur but no magnesium in the clinker. The raw material is mixed according to the raw material ratio and mixed evenly, then the mixed raw material is calcined, the temperature is raised at 10°C / min during the calcining stage, the temperature is raised to 1500°C, kept for 1 hour, and then cooled at a cooling rate of 60°C / min to room temperature (generally 15-40°C), the fired clinker is ground t...

Embodiment 3

[0065] Using analytically pure CaCO 3 , SiO 2 , Al 2 o 3 , Fe 2 o 3 , MgO and desulfurized gypsum for raw meal configuration, the design clinker mineral composition is C 3 S 63.42%, C 2 S 17.70%, C 3 A 8.6%, C 4 AF 10.28%, design clinker rate value KH=0.91, SM=2.60, IM=1.60. The clinker MgO content is 3.0% in embodiment 3, SO 3Incorporated in the form of desulfurized gypsum, SO in clinker 3 The content is 2.18%. The comparative A3 contains no magnesium and sulfur in the clinker, the comparative F contains magnesium but no sulfur in the clinker, and the comparative G contains sulfur but no magnesium in the clinker. The raw material is mixed according to the raw material ratio and mixed evenly, then the mixed raw material is calcined, the temperature is raised at 10°C / min during the calcining stage, the temperature is raised to 1500°C, kept for 1 hour, and then cooled at a cooling rate of 60°C / min to room temperature (generally 15-40°C), the fired clinker is ground t...

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Abstract

The invention discloses a method for regulating and controlling an alite crystal structure in cement clinker. Th method comprises the following steps: simultaneously introducing a magnesium element and a sulfur element in the preparation process of a Portland cement raw material, and completely converting M3-type alite in the clinker into M1-type alite under the combined action of the magnesium element and the sulfur element. The raw materials used in the crystal structure regulation and control method are easy to obtain, and the method is simple, easy to operate and high in universality. In actual production, desulfurized gypsum, phosphogypsum and the like can be used as sulfur sources, so that the comprehensive utilization value of industrial by-products is increased. The magnesium source can be selected from low-quality limestone, no additional ingredient components need to be added, the operation is convenient, the use of the low-quality limestone is increased, and the production cost is reduced. After being regulated and controlled by the method, the alite crystal structure in the Portland cement clinker can be completely converted from M3 type or M1 / M3 mixed type into M1 type.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a control method for alite crystal structure in cement clinker. Background technique [0002] my country's cement industry is developing rapidly. In 2019, my country's cement output was nearly 2.33 billion tons, a year-on-year increase of 6.1%, accounting for more than 50% of the world's total cement output, ranking first in the world. Although my country is a big country in cement production, it is not a powerful country. The overall quality of cement is not high, which affects the life of concrete projects in our country. Therefore, the performance of the output cement must be improved. Portland cement is the cement variety with the largest output, the largest amount of use, and the widest range of applications. It is mainly composed of Portland cement clinker, gypsum and mixed materials. To improve the performance of Portland cement, mainly improve the perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42C04B7/36C04B7/44C04B7/47
CPCC04B7/425C04B7/424C04B7/36C04B7/44C04B7/47C04B7/3453C04B7/4407
Inventor 周昊李晓冬史超其沈晓冬王倩倩于竹青
Owner NANJING UNIV OF TECH
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