Sludge-high calcium fly ash alkali-excited cement and preparation method thereof

A technology of high-calcium fly ash and alkali excited cement, which is applied in the field of materials to achieve the effects of reducing costs, reducing resource consumption and saving energy consumption

Inactive Publication Date: 2010-09-15
TONGJI UNIV
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  • Abstract
  • Description
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Problems solved by technology

At present, these sludges can only be landfilled or inciner

Method used

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  • Sludge-high calcium fly ash alkali-excited cement and preparation method thereof
  • Sludge-high calcium fly ash alkali-excited cement and preparation method thereof

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Embodiment Construction

[0021] The main raw material air-dried sludge of the six embodiments of the present invention is the natural air-dried sludge piled up in the field of a water treatment plant, and the high-calcium fly ash is taken from a power plant with a specific surface area of ​​385m 2 / kg, the main chemical composition and mass percentage (wt.%) of air-dried sludge and high-calcium fly ash are shown in Table 1. Used sodium hydroxide is a chemical reagent containing 99.2% NaOH; commercially available liquid sodium silicate has a solid content of 38.3% and contains 9.1% NaOH 2 O, 29.2% SiO 2 and 61.7% water.

[0022] Table 1 The present invention uses the main chemical composition and content (wt.%) of air-dried sludge and high-calcium fly ash

[0023]

[0024] Example ①

[0025] a. Mix sodium hydroxide with liquid sodium water glass to control its modulus M (SiO 2 ) / n(Na 2 O) is 1.5, made into a compound chemical admixture, aged for 24h, and set aside.

[0026] b. Control the temp...

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Abstract

The invention discloses sludge-high calcium fly ash alkali-excited cement and a preparation method thereof. The alkali-excited cement uses high calcium fly ash as a main raw material, thermally activated sludge as a mineral additive and solution prepared from sodium hydroxide and liquid sodium silicate as a composite chemical additive and makes the system have good performance in a certain curing environment. The method alleviates the environmental burden, and reduces the cost and resource consumption by using industrial waste such as high calcium fly ash and sludge; and the novel alkali-excited cement only has little emission of greenhouse gas, is a low-carbon emission, green and environment-friendly gel material, meets the trend of current social development, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a composite chemical additive prepared by using high-calcium fly ash as a silicon-aluminum source raw material, using heat-activated sludge as a mineral additive, and using a solution prepared from sodium silicate and sodium hydroxide as a composite chemical additive. Novel low-carbon emission alkali-activated cement and a preparation method thereof. Background technique [0002] Cement is a traditional cementitious material, which has made great contributions to human economic development and social progress. However, the shortage of raw materials for Portland cement has become a very urgent practical problem that the world must face. will run out. In addition, Portland cement not only consumes a lot of energy, but also its production process is a process of high carbon emissions. The production of 1 ton of cement will emit about 1 ton of greenhouse gases. Therefore, countries have intr...

Claims

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Application Information

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IPC IPC(8): C04B7/28
CPCY02P40/10
Inventor 郭晓潞施惠生
Owner TONGJI UNIV
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