Method for improving utilization efficiency of gypsum in sulphoaluminate cement

A technology for sulphoaluminate cement and gypsum, which is applied in the field of improving the utilization efficiency of gypsum in sulphoaluminate cement, so as to achieve the effects of reducing the amount of addition, improving the strength of the gel, and suppressing the shrinkage defect of compressive strength

Inactive Publication Date: 2020-07-31
肥西县创玺建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the existing problems and provide a method for improving the utilization efficiency of gypsum in sulphoaluminate cement, which can ensure that the early strength of sulphoaluminate cement is at a high level and the later strength development is sustained and stable, and the cement strength and high durability

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  • Method for improving utilization efficiency of gypsum in sulphoaluminate cement

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Embodiment 1

[0020] A method for improving the utilization efficiency of gypsum in sulphoaluminate cement. The natural gypsum is pretreated to improve its activation performance, and then used for the preparation of sulphoaluminate cement clinker and the post-mixing of clinker.

[0021] Specifically, the preparation of sulphoaluminate cement clinker: grind the raw material with a good proportion, grind the powder to pass through a 70-micron sieve, and carry out heating and calcination. The clinker firing process temperature is 1090°C, and heat preservation 20-25 minutes, cooling to obtain sulphoaluminate cement clinker.

[0022] The main components of the sulphoaluminate cement raw meal are calculated by mass percentage: limestone accounts for 48%, bauxite accounts for 27%, pretreated gypsum accounts for 4.5%, and the rest is aluminum ash and a small amount of impurities.

[0023] The limestone used was taken from Limestone Factory in Nanyang, Henan; the bauxite and aluminum ash slag were ...

Embodiment 2

[0029] A method for improving the utilization efficiency of gypsum in sulphoaluminate cement. The natural gypsum is pretreated to improve its activation performance, and then used for the preparation of sulphoaluminate cement clinker and the post-mixing of clinker.

[0030] Specifically, the preparation of sulphoaluminate cement clinker: grind the raw material with a good ratio, grind the powder to pass through a 75 micron sieve, and carry out heating and calcination. After 22 minutes, cool to obtain sulphoaluminate cement clinker.

[0031] The main components of the sulphoaluminate cement raw meal are calculated by mass percentage: limestone accounts for 51%, bauxite accounts for 30%, pretreated gypsum accounts for 5.0%, and the rest is aluminum ash and a small amount of impurities.

[0032] The limestone used was taken from Limestone Factory in Nanyang, Henan; the bauxite and aluminum ash slag were taken from Guiyang Fangcheng Mining Co., Ltd.

[0033] Wherein, the preparat...

Embodiment 3

[0038] A method for improving the utilization efficiency of gypsum in sulphoaluminate cement. The natural gypsum is pretreated to improve its activation performance, and then used for the preparation of sulphoaluminate cement clinker and the post-mixing of clinker.

[0039] Specifically, the preparation of sulphoaluminate cement clinker: grind the raw material with a good proportion, grind the powder to pass through a 80-micron sieve, and carry out heating and calcination. The clinker firing process temperature is 1100 ° C, and heat preservation After 25 minutes, cool to obtain sulphoaluminate cement clinker.

[0040] The main components of the sulphoaluminate cement raw meal are calculated by mass percentage: limestone accounts for 54%, bauxite accounts for 33%, pretreated gypsum accounts for 5.5%, and the rest is aluminum ash and a small amount of impurities.

[0041] The limestone used was taken from Limestone Factory in Nanyang, Henan; the bauxite and aluminum ash slag wer...

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Abstract

The invention relates to the technical field of preparation of novel building materials, and discloses a method for improving the utilization efficiency of gypsum in sulphoaluminate cement. The methodincludes pre-treating Gypsum to improve the activation performance of the gypsum; applying same for respectively preparing sulphoaluminate cement clinker and adding pretreated gypsum into the sulphoaluminate cement clinker in a post-mixing manner, thus improving the gel strength and reducing the water demand, promoting sulphoaluminate cement clinker firing, and reducing combustion temperature andcarbon dioxide yield; according to the invention, the zinc-containing multi-metal nano powder is utilized to improve the hydration activity of the calcium sulphoaluminate mineral, a large amount of post-doped gypsum is not needed, and the prepared sulphoaluminate cement has the strength 12-17% higher than that of the sulphoaluminate cement added by 2 times of the amount of gypsum. The invention solves the problems of high gypsum consumption and poor accumulation effect in the preparation of sulphoaluminate cement, further enhances the resistance, durability, cracking resistance and other properties of the sulphoaluminate cement, and effectively inhibits the defect of later compressive strength shrinkage of the sulphoaluminate cement.

Description

technical field [0001] The invention belongs to the technical field of preparation of new building materials, and in particular relates to a method for improving the utilization efficiency of gypsum in sulphoaluminate cement. Background technique [0002] Sulphoaluminate cement is independently researched and invented by China Academy of Building Materials Science. In 2000, the output of sulphoaluminate cement in my country was only 672,500 tons. By 2005, my country's sulfur (iron) aluminate cement output reached 1.253 million tons. There are 30 enterprises producing sulphoaluminate cement in my country, and the national output of sulphoaluminate cement is basically stable at about 1.25 million tons. Sulphoaluminate cement has the characteristics of early strength and high strength, so it is widely used in special construction engineering fields such as hydraulic engineering and rapid repair engineering. Compared with general-purpose Portland cement, sulfoaluminate cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42C04B7/36C04B7/32C04B7/44
CPCC04B7/323C04B7/36C04B7/421C04B7/44
Inventor 郭平
Owner 肥西县创玺建材科技有限公司
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