Desulfurized gypsum-high-calcium fly ash geopolymer cementing material and preparation method thereof

A technology of high-calcium fly ash and desulfurized gypsum, applied in the field of materials, can solve the problems of high carbon emission and high energy consumption, and achieve the effects of reducing the burden on the environment, reducing huge pressure and reducing costs

Active Publication Date: 2010-10-13

安徽地豪科技环保材料有限公司

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Problems solved by technology

In addition, Portland cement not only consumes a lot of energy, but also its production process is a proc...

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Abstract

The invention discloses a desulfurized gypsum-high-calcium fly ash geopolymer cementing material and a preparation method thereof. In the geopolymer cementing material, high-calcium fly ash is used as a main raw material, desulfurized gypsum after heat treatment is used as a mineral admixture, and a solution prepared by sodium hydroxide and liquid sodium silicate is used as a composite chemical admixture. The invention determines the heat treatment mode of the desulfurized gypsum and the modulus and the addition of the composite chemical admixture, and enables the system to have better performance in certain curing environment. In the invention, high-calcium fly ash and sludge which are industrial wastes are utilized, thereby relieving the environmental burden, lowering the cost and reducing resource consumption. Moreover, the geopolymer cementing material is an environment-friendly cementing material with low carbon emission, meets the current social development trend, and has good economic benefit and social benefit.

Application Domain

Solid waste managementCement production

Technology Topic

Industrial wasteSodium silicate +16

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Examples

Experimental program(1)

Example Embodiment

[0020] The main raw materials desulfurized gypsum and high-calcium fly ash in the six embodiments of the present invention are taken from a certain power plant, and their main components are shown in Table 1. Sodium hydroxide is a chemical reagent containing 99.2% NaOH; commercially available liquid sodium water glass has a solid content of 38.3% and contains 9.1% Na 2 O, 29.2% SiO 2 And 61.7% water.

[0021] Table 1 The main chemical composition and content of desulfurized gypsum and high calcium fly ash (wt.%)

[0022]

[0023] Example ①

[0024] a. Mix sodium hydroxide and 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.

[0025] b. Control the heating rate to 10°C/min, heat the desulfurized gypsum to 600°C, calcinate for 1 hour, and prepare the heat-treated desulfurized gypsum, which will be used after cooling.

[0026] c. Mix high-calcium fly ash and heat-treated desulfurized gypsum at a mass ratio of 9:1, and add the prepared composite chemical admixture, Na introduced by the composite chemical admixture 2 The mass of O is 10% of the sum of the mass of high-calcium fly ash and heat-treated desulfurized gypsum, and the water-cement ratio of the system composed of high-calcium fly ash, heat-treated desulfurized gypsum and compound chemical additives is controlled to be 0.4, and the sample is obtained .

[0027] d. The prepared sample is hydrothermally cured at 75°C for 4h-24h to obtain the desulfurized gypsum-high calcium fly ash geopolymer cementing material of the present invention.

[0028] The remaining conditions and steps of Example ② are the same as those of Example ①. The difference is that step d is: curing the prepared sample at room temperature for 3 to 28 days to obtain the desulfurized gypsum-high calcium fly ash polymerization of the present invention 物 Cementing material.

[0029] Example ③

[0030] a. Mix sodium hydroxide and 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.

[0031] b. Control the heating rate to 10°C/min, heat the desulfurized gypsum to 800°C, calcinate for 1 hour, and prepare the heat-treated desulfurized gypsum, which will be used after cooling.

[0032] c. Mix high-calcium fly ash and heat-treated desulfurized gypsum at a mass ratio of 9:1, and add the prepared composite chemical admixture, Na introduced by the composite chemical admixture 2 The mass of O is 10% of the sum of the mass of high-calcium fly ash and heat-treated desulfurized gypsum, and the water-cement ratio of the system composed of high-calcium fly ash, heat-treated desulfurized gypsum and compound chemical additives is controlled to be 0.4, and the sample is obtained .

[0033] d. The prepared sample is hydrothermally cured at 75°C for 4h-24h to obtain the desulfurized gypsum-high calcium fly ash geopolymer cementing material of the present invention.

[0034] The remaining conditions and steps of Example ④ are the same as those of Example ③, except that step d is: curing the prepared sample at room temperature for 3 to 28 days to obtain the desulfurized gypsum-high calcium fly ash polymerization of the present invention 物 Cementing material.

[0035] Example ⑤

[0036] a. Mix sodium hydroxide and 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.

[0037] b. Control the heating rate to 10°C/min, heat the desulfurized gypsum to 800°C, calcinate for 1 hour, and prepare the heat-treated desulfurized gypsum, which will be used after cooling.

[0038] c. Mix high-calcium fly ash and heat-treated desulfurized gypsum at a mass ratio of 8:2, and add the prepared composite chemical admixture, Na introduced by the composite chemical admixture 2 The mass of O is 10% of the sum of the mass of high-calcium fly ash and heat-treated desulfurized gypsum, and the water-cement ratio of the system composed of high-calcium fly ash, heat-treated desulfurized gypsum and compound chemical additives is controlled to be 0.4, and the sample is obtained .

[0039] d. The prepared sample is hydrothermally cured at 75°C for 4h-24h to obtain the desulfurized gypsum-high calcium fly ash geopolymer cementing material of the present invention.

[0040] The remaining conditions and steps of Example ⑥ are the same as those of Example ③, except that step d is: curing the prepared sample at room temperature for 3 to 28 days to obtain the desulfurized gypsum-high calcium fly ash polymerization of the present invention 物 Cementing material.

[0041] The basic properties of the desulfurized gypsum-high calcium fly ash geopolymer cementing material prepared from the above six examples are shown in Table 2.

[0042] Table 2 Basic properties of desulfurized gypsum-high calcium fly ash geopolymer cementing material

[0043]

[0044] From the data in Table 2, it can be seen that the desulfurized gypsum-high calcium fly ash geopolymer cementitious material prepared according to the preparation method of the embodiment has excellent properties, and its compressive strength is comparable to that of "Masonry Cement" (GB/T). 3183-2003) is equivalent to 12.5 grade masonry cement, which can replace this grade of masonry cement to be used in actual projects.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce the burden on the environment
Low cost

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Reduce resource consumption Reduce energy consumption Good economic and social benefits Polymer Sludge Economic benefits Toxic industrial waste Sodium Gypsum

Desulfurized gypsum-high-calcium fly ash geopolymer cementing material and preparation method thereof

A technology of high-calcium fly ash and desulfurized gypsum, applied in the field of materials, can solve the problems of high carbon emission and high energy consumption, and achieve the effects of reducing the burden on the environment, reducing huge pressure and reducing costs

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

PUM

Description & Claims & Application Information

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