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Method for preparing cement admixture, cement admixture and cement composition

A cement admixture and cement technology, which is applied in the field of solid waste resource utilization, can solve the problems such as the lack of attention and utilization of microbeads in coal gasification fine slag, and achieve the improvement of cement product performance, good fluidity and good separation effect. Effect

Active Publication Date: 2018-03-30
鄂尔多斯市慧恒科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although there are a few studies on coal gasification slag, they only directly select gasification coarse slag in a certain particle size range as the mixture, and do not pay attention to and utilize the characteristics of microbeads in coal gasification fine slag.

Method used

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  • Method for preparing cement admixture, cement admixture and cement composition
  • Method for preparing cement admixture, cement admixture and cement composition
  • Method for preparing cement admixture, cement admixture and cement composition

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take 1000g of coal gasification fine slag (wherein the solid content is about 55%), and prepare a coal gasification fine slag slurry with a solid content of 10wt%, and use a high-speed dispersion mixer (Guangdong Foshan Yifu Machinery Co., Ltd.) to stir at room temperature. The stirring time is 1800r / min, and the stirring time is 20min; the slurry is introduced into a cyclone separator for separation, and the obtained lower slurry is a silicon-rich slurry, and the carbon content in the solid phase is 8.5wt% after testing;

[0029] The separated slurry was subjected to solid-liquid separation, dried at 120°C, and calcined at 600°C for 2 hours to activate carbon removal; take 360g of No. 425 Portland cement (from Yatai Cement Co., Ltd.), 1200g of sand, and 40g of gas after carbon removal. Thin slag microbeads, add 200g of water to reconcile and stir to obtain a mixture; test its fluidity to be 174.5mm; its 3-day, 7-day and 28-day strength test results are shown in Table 1....

Embodiment 2

[0037] Take 1000g of coal gasification fine slag (wherein the solid content is about 55%), and prepare a coal gasification fine slag slurry with a solid content of 20wt%, and use a high-speed dispersion mixer (Guangdong Foshan Yifu Machinery Co., Ltd.) to stir at room temperature. The stirring time is 1800r / min, and the stirring time is 30min; the slurry is introduced into the cyclone separator for separation, and the obtained lower slurry is the silicon-rich slurry, and the carbon content in the solid phase is 6wt% after testing;

[0038] The separated slurry is subjected to solid-liquid separation, dried at 120°C, and calcined at 650°C for 2 hours to activate carbon removal; take 340g of No. 425 Portland cement, 1200g of sand, 60g of gasified fine slag beads after carbon removal, and add 200g of water to blend Stir to obtain a mixture; test its fluidity to be 170.5mm, which is significantly higher than that of Comparative Example 1; its 3-day, 7-day and 28-day strength test r...

Embodiment 3

[0044] Take 1000g of coal gasification fine slag (wherein the solid content is about 55%), and prepare a coal gasification fine slag slurry with a solid content of 30wt%, and use a high-speed dispersion mixer (Guangdong Foshan Yifu Machinery Co., Ltd.) to stir at room temperature, and the stirring speed The stirring time is 1600r / min, and the stirring time is 40min; the slurry is introduced into a cyclone separator for separation, and the obtained lower slurry is the silicon-rich slurry, and the carbon content in the solid phase is 6.5wt% after testing;

[0045] The separated slurry is subjected to solid-liquid separation, dried at 120°C, and calcined at 700°C for 1.5h to activate carbon removal; take 320g of No. 425 Portland cement, 1200g of sand, and 80g of gasified fine slag beads after carbon removal, and add 200g of water Reconcile and stir to obtain a mixture; the fluidity of the test is 165.0mm, which is obviously higher than that of Comparative Example 1; the strength t...

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Abstract

The invention discloses a method for preparing a cement admixture from fine coal gasification slag. The method comprises the following steps: 1, taking a proper amount of the fine coal gasification slag, and adding water to prepare a fine coal gasification slag slurry with the solid content being 10-30 wt%; 2, fully stirring the slurry prepared in step 1, carrying out gravity cyclone separation, and collecting the obtained heavy separation product to obtain a silicon-rich composite slurry; and 3, carrying out solid-liquid separation, drying and calcination activation on the silicon-rich composite slurry to obtain the cement admixture. The invention also discloses the cement admixture and a cement composition containing the cement admixture. The cement admixture is prepared from the fine coal gasification slag, so the high-added value development of the fine coal gasification slag is realized; glass beads in the fine coal gasification slag play a good role in a cement product as a rheological agent and a reinforcing agent to improve the performances of the cement product; and the land occupation and environment pollution problems of the fine coal gasification slag are solved, and the fine coal gasification slag are efficiently used.

Description

technical field [0001] The invention belongs to the technical scope of resource utilization of solid waste, and in particular relates to a method for preparing cement admixture by using coal gasification fine slag, the prepared cement admixture and a cement composition. Background technique [0002] Coal gasification technology is one of the core contents of clean coal technology. Combustible coal gasification gas (such as crude gas) can be obtained by incomplete oxidation of coal, which has rapidly become an important direction of coal resource and energy utilization in recent years. In the past 20 years, my country has built a number of coal chemical enterprises in Yulin, Shaanxi, Ordos, Inner Mongolia, Changzhi, Shanxi and other places, which have been put into production one after another, and the output has increased year by year. The clean and comprehensive utilization of coal resources has formed a certain scale in my country. [0003] In the coal gasification technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B28/04C04B18/06
CPCC04B20/04C04B28/04C04B2201/50C04B2201/52C04B18/065C04B14/06Y02W30/91
Inventor 雒锋魏存弟蒋引珊杨殿范徐少南艾卫东刘硕
Owner 鄂尔多斯市慧恒科技有限责任公司
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