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Fly ash silicate cement prepared by using CFBC desulphurized ash

A Portland cement and desulfurization ash technology, applied in cement production, etc., can solve the problems of low utilization rate of CFBC desulfurization ash, sulfur dioxide re-pollution, etc., and achieve the effects of easy promotion and use, low cost and simple production process

Inactive Publication Date: 2010-02-10
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem that the utilization rate of CFBC desulfurization ash is relatively low, and the production of cement by the re-calcination process may cause sulfur dioxide pollution again, and provides a fly ash portland cement directly produced by using CFBC desulfurization ash

Method used

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  • Fly ash silicate cement prepared by using CFBC desulphurized ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Components and proportions: CFBC desulfurization ash 40%, Portland cement clinker 56%, gypsum 4%.

[0012] Process: After mixing the components, grind them until the sieve residue of 80 μm is 4.71%, and then the 32.5 grade fly ash Portland cement is obtained.

[0013] Effect: See Table 1.

Embodiment 2

[0015] Components and proportions: CFBC desulfurization ash 50%, Portland cement clinker 45%, gypsum 5%.

[0016] Process: After mixing the components, grind them until the sieve residue of 80 μm is 3.54%, and then the 32.5 grade fly ash Portland cement is obtained.

[0017] Effect: See Table 1.

Embodiment 3

[0019] Components and proportions: CFBC desulfurization ash 30%, Portland cement clinker 65%, gypsum 5%.

[0020] Process: After mixing the components, grind them until the sieve residue of 80 μm is 4.33%, and then the 32.5 grade fly ash Portland cement is obtained.

[0021] Effect: See Table 1.

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Abstract

The invention discloses a fly ash silicate cement prepared by using CFBC desulphurized ash, comprising the following components by weight percent: 15-50% of CFBC desulphurized ash, 44-83% of silicatecement clinker and 2-6% of gypsum, wherein the prepared fly ash silicate cement 32.5 grade comprises the following components by weight percent: 30-50% of CFBC desulphurized ash, 44-68% of silicate cement clinker and 2-6% of gypsum, and the prepared fly ash silicate cement 42.5 grade comprises the following components by weight percent: 15-30% of CFBC desulphurized ash, 64-83% of silicate cement clinker and 2-6% of gypsum. The fly ash silicate cement provided by the invention contains high content of CFBC desulphurized ash so as to resolve the problem that the utilization of CFBC desulphurizedash is low and the resources are wasted and provide a new cement production process. In addition, the fly ash silicate cement of the invention has simple production process and low cost, is easy to popularize and use, and has great economic, social and environmental benefits.

Description

technical field [0001] The invention relates to a building material, in particular to a fly ash portland cement produced by utilizing desulfurization ash discharged from a circulating fluidized bed boiler (Circulating Fluidized Bed Combustion, referred to as CFBC). Background technique [0002] CFBC combustion technology is a clean combustion technology developed in the 1980s. This technology has the following characteristics: firstly, it has the advantages of good fuel adaptability, it can burn low-quality coal, such as coal gangue, and can burn domestic garbage and various industrial wastes; secondly, the combustion temperature of CFBC is low (800°C ~900℃), the NO emitted by the combustion process x In addition, this combustion technology also has the advantages of simple process, small footprint, large load adjustment range, high combustion efficiency, and limestone can be added to the boiler for desulfurization in the furnace to achieve combustion Simultaneously with d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCC04B7/04Y02P40/10C04B7/28
Inventor 付晓茹黎飞虎方华张慧
Owner NANJING UNIV OF INFORMATION SCI & TECH
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