Method for preparing quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash

A waste incineration fly ash, cement-based technology, used in adhesives, cement production, inorganic adhesives and other directions, can solve problems such as easy accidents, tile falling off, unpredictable tile falling off, etc., to ensure product performance and good economy. and social benefits

Inactive Publication Date: 2010-12-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using cement paste, the tiles are easy to fall off due to the large shrinkage of the cement after hydration, and the falling off of the tiles is unpredictable, which may easily cause accidents
So people began to use cement mortar. Although cement mortar shrinks less than pure cement, the main reason is that the existence of sand limits the shrinkage of some cement, but it does not fundamentally solve the problem. The flexibility of mortar is still poor, and the problem of tile falling off still exists.

Method used

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  • Method for preparing quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash
  • Method for preparing quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash
  • Method for preparing quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0020] The main raw materials are desulfurization gypsum, waste incineration fly ash, limestone, bauxite. The main chemical components of the raw materials are shown in Table 1.

[0021] Table 1 Chemical Composition / wt% of Raw Materials

[0022]

[0023] Calculated according to the designed mineral clinker composition: garbage ash: 15%; limestone: 36%; desulfurized gypsum: 19%; bauxite: 30%. The raw materials in the above ratio were calcined in an electric furnace at 1200° C. for 1 hour at a heating rate of 30° C. / min, and then taken out for rapid cooling. The chemical composition of the sulfoaluminate clinker is shown in Table 2.

[0024] Table 2 The main chemical components of sulphoaluminate clinker / %

[0025]

[0026] The above-mentioned calcined clinker was mixed with 5% anhydrite to make sulphoaluminate cement, and its physical properties are shown in Table 3.

[0027] Table 3 Main physical properties of sulphoaluminate cement

[0028]

[0029] Mix the abo...

Embodiment 4

[0037] A kind of method utilizing refuse incineration fly ash to prepare quick-hardening type cement-based adhesive, this method comprises the following steps:

[0038] (1) Calcination of sulphoaluminate cement

[0039] Sulphoaluminate raw meal: 18wt% of waste incineration fly ash, 15wt% of desulfurized gypsum, 35wt% of limestone, and 32wt% of bauxite were prepared in an electric furnace at a heating rate of 20°C / min to 1200°C, and then kept for 1 hour. Sulphoaluminate clinker is formed by mixing 90% of sulphoaluminate clinker with 10wt% of anhydrite to obtain sulphoaluminate cement;

[0040] The quality of sulphoaluminate clinker complies with the relevant regulations in "Sulphoaluminate Cement" (GB 20472-2006): that is, Al in clinker 2 o 3 ≥30.0%; SiO 2 ≤10.5%, the compressive strength of sulphoaluminate cement clinker 3d is ≥55MPa. The main mineral composition of sulphoaluminate clinker is as follows: 75wt%%;C 2 S15wt%; C 4 AF3wt%.

[0041] (2) Preparation of rapid...

Embodiment 5

[0044] A kind of method utilizing refuse incineration fly ash to prepare quick-hardening type cement-based adhesive, this method comprises the following steps:

[0045] (1) Calcination of sulphoaluminate cement

[0046] Sulphoaluminate raw meal: waste incineration fly ash 10wt%, desulfurization gypsum 25wt%, limestone 40wt%, bauxite 25wt%, in an electric furnace at a heating rate of 30°C / min to 1250°C, and then keep it warm for 2 hours Making sulphoaluminate clinker, mixing 95% of sulphoaluminate clinker with 5wt% of anhydrite to obtain sulphoaluminate cement;

[0047] The quality of sulphoaluminate clinker complies with the relevant regulations in "Sulphoaluminate Cement" (GB 20472-2006): that is, Al in clinker 2 o 3 ≥30.0%; SiO 2 ≤10.5%, the compressive strength of sulphoaluminate cement clinker 3d is ≥55MPa. The main mineral composition of sulphoaluminate clinker is as follows: 55wt%; C 2 S30wt%; C 4 AF6wt%.

[0048] (2) Preparation of rapid-hardening cement-based ...

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Abstract

The invention relates to a method for preparing a quick-hardened cement-based adhesive by utilizing refuse-incinerated fly ash, comprising the following steps of: (1) calcination of sulphoaluminate cement: raising the temperature of a sulphoaluminate cement raw material to 1,200-1,250 DEG C in the temperature rise speed of 20-30 DEG C/min, then preserving the temperature for 1-2h to form a sulphoaluminate cement clinker, and mixing the sulphoaluminate cement clinker with anhydrous gypsum to obtain the sulphoaluminate cement; and (2) preparation of the quick-hardened cement-based adhesive: blending the sulphoaluminate cement, quartz sand, pulverized fuel ash, hydroxypropyl methyl cellulose, re-dispersible rubber powder and fibers to obtain the quick-hardened cement-based adhesive. Comparedwith the prior art, the method can ensure the performance of the product and also can reduce serious environmental burden and processing cost which are caused by not utilizing the fly ash, desulfurized gypsum and the like.

Description

technical field [0001] The invention belongs to the field of new material technology, environmental protection and energy saving technology, and relates to the utilization of solid waste such as garbage incineration fly ash and the technology for producing a fast-hardening cement-based gelling agent. Background technique [0002] With the rapid development of urban construction and rapid population growth, the discharge of municipal solid waste is also increasing sharply, and its composition is becoming more and more complex. Taking domestic waste as an example, the national urban domestic waste removal volume was only 53.98 million tons in 1987, and it soared to 120 million tons in 1997. In 2002, my country's urban waste has reached more than 150 million tons, and the annual rate is 8% to 10%. The speed is increasing, and it is estimated that by 2010, the annual discharge of municipal solid waste in my country will reach 210 million tons. These wastes pose a serious threat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/00
CPCC04B7/32C04B28/06Y02P40/121Y02W30/91C04B14/06C04B14/28C04B14/303C04B18/08C04B20/0048C04B22/145C04B24/26C04B24/383C04B2103/0057C04B7/44
Inventor 施惠生吴凯邓恺原峰
Owner TONGJI UNIV
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