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Low-alkali sulpho-aluminate cement calcined by using refuse incineration flyash and preparation thereof

A technology of waste incineration fly ash and alkali sulfoaluminate, applied in cement production, etc., can solve problems such as long-standing disadvantages, secondary pollution of desulfurized gypsum, climate, soil, plants and human health hazards, and reduce energy consumption, Ease the tension of resources, good economic benefits and social benefits

Inactive Publication Date: 2008-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the consequence of this limestone-gypsum wet desulfurization process is that a large amount of desulfurized gypsum is piled up and decomposed to cause secondary pollution, which is harmful to climate, soil, plants and human health
In addition, the by-product gypsum in the production process of many chemical companies has long been a problem

Method used

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  • Low-alkali sulpho-aluminate cement calcined by using refuse incineration flyash and preparation thereof
  • Low-alkali sulpho-aluminate cement calcined by using refuse incineration flyash and preparation thereof
  • Low-alkali sulpho-aluminate cement calcined by using refuse incineration flyash and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1-4

[0025] The main raw materials used in the examples include desulfurized gypsum, waste incineration fly ash, and low-grade bauxite, and the corrected raw materials include fly ash and limestone. The desulfurization gypsum was taken from the gray-white undisturbed desulfurization gypsum of Hangzhou Banshan Power Plant. The sieve of 0.045mm square hole was 11.9%, and the free water content of undisturbed desulfurization gypsum was 15%. Waste incineration fly ash was taken from Suzhou Waste Incineration Plant, with an average particle size of 11.25 μm , moisture content 1.5%, loss on ignition 13.8%; low-grade bauxite was obtained from Shanghai Chuansha Refractory Material Factory, and the remaining 14.5% was sieved through a 0.045mm square hole sieve after drying. The raw material fly ash for calibration is Class II fly ash of Shanghai Yangpu Power Plant, with a density of 2.05g / cm 3 , 0.045mm square hole sieve remaining 5.8%, limestone is provided by Shanghai Changxing Limestone ...

Embodiment 1

[0029] Example 1: Desulfurization gypsum: 15; waste incineration fly ash: 42; low-grade bauxite: 20; limestone: 21; fly ash: 2.

Embodiment 2

[0030]Example 2: desulfurized gypsum: 20; waste incineration fly ash: 15; low-grade bauxite: 30; limestone: 35; fly ash: 0.

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Abstract

The invention belongs to the new material and environmental protection technical field, in particular relating to low-alkali sulphoaluminate cement produced by utilizing waste incineration fly ash and a method for preparing the same. The cement consists of the waste incineration fly ash, low-grade alumyte, desulfurization gypsum, pulverized fuel ash and limestone, wherein, the waste incineration fly ash is 15 to 42 weight percent; the low-grade alumyte is 20 to 30 weight percent, the desulfurization gypsum is 15 to 20 weight percent, and the balance is the limestone and the pulverized fuel ash the amount of which is determined by material proportion and meets the 100 percent total weight. The method comprises the following steps that: the waste incineration fly ash, the low-grade alumyte, the desulfurization gypsum, the pulverized fuel ash and the limestone are mixed and milled according to weight and pressed into a pat; the pat is put into a silicon carbide furnace and the temperature increases to between 1200 and 1230 DEG at a speed of 0.5-0.8 DEG C per second, the pat is kept in the temperature for 50 to 70 minutes and then taken out for sharp quenching to the room temperature, and sulphoaluminate cement clinker is obtained; the sulphoaluminate cement clinker is milled to 400 +- 10 m<2> / kg, and the cement is obtained. The low-alkali sulphoaluminate cement can not only reduce the production cost of the cement clinker, but also effectively lighten the energy consumption and relieve the strain of resources, thereby the cement is a novel environment-friendly building material, and has good economic and social benefits and important meaning for energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of new materials and environmental protection, and in particular relates to a low-alkali sulphoaluminate cement fired by utilizing waste incineration fly ash and a preparation method thereof. technical background [0002] Compared with traditional portland cement, sulphoaluminate cement has the characteristics of early strength, high strength, low creep, freeze-thaw resistance, impermeability, and corrosion resistance. It is widely used in high-grade concrete structural engineering, winter construction engineering, cement Products, GRC products and various special projects are widely valued and welcomed by the engineering community. However, currently commercially available sulphoaluminate cement is mainly based on calcined high-grade bauxite, limestone, natural dihydrate gypsum (CaSO 4 2H 2 O) is the main raw material for production. Due to the current effective use of resources and energy and environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32
CPCC04B7/323Y02P40/10C04B7/28
Inventor 施惠生张新辉邓恺原峰吴凯
Owner TONGJI UNIV
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