Method for preparing glass ceramic material with high-calcium sulfur-fixing flyash

A technology of glass ceramics and fly ash, which is applied in the field of disposal and reuse of high-calcium sulfur-fixed fly ash, can solve the problems of low utilization rate of fly ash and low proportion of fly ash added, and achieve reduction of preparation cost, The effect of reducing the amount of addition and increasing the utilization ratio

Inactive Publication Date: 2016-12-07
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CaO-Al is generally used in China 2 o 3 -SiO 2 system, but because the CaO content in the fly ash of the pulverized coal furnace is low, in order to adjust the product composition or improve the viscosity, a certain amount of CaO needs to be added, so the actual addition ratio of the fly ash is low
In addition, if the publication date is October 9, 2013, the Chinese patent with the publication number CN103342465A discloses a method for preparing glass ceramics by using red mud and fly ash, and if the publication date is November 28, 2012 In the Chinese patent whose publication number is CN102795773A, a method for preparing glass ceramics by compounding lime mud and fly ash is disclosed. Another example is that the publication date is November 11, 2009, and the publication number is CN101575171. In the Chinese patent, A method for preparing glass ceramics from boron mud fly ash is disclosed. In these methods, the actual addition ratio of fly ash is also low, and the utilization rate of fly ash is not high

Method used

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  • Method for preparing glass ceramic material with high-calcium sulfur-fixing flyash
  • Method for preparing glass ceramic material with high-calcium sulfur-fixing flyash
  • Method for preparing glass ceramic material with high-calcium sulfur-fixing flyash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The glass-ceramic material was prepared by using the sulfur-fixed fly ash of the 150MW circulating fluidized bed unit of Guizhou Huadian Bijie Thermal Power Co., Ltd. as the raw material. The chemical composition of the raw material is shown in Table 1. The specific operation steps are as follows:

[0024] Table 1 Composition of sulfur-fixed fly ash of Guizhou Huadian Bijie Thermal Power Co., Ltd. 150MW circulating fluidized bed unit

[0025] Element

SiO 2

Al 2 o 3

CaO

SO 3

MgO

TiO 2

Fe 2 o 3

Na 2 o

K 2 o

content(%)

21.8

16.9

35.5

14.3

1.04

1.43

7.3

0.74

0.69

[0026] (1) According to Al 2 o 3 2 2 The powder is ground and mixed evenly, and the percentages are all percentages by mass.

[0027] (2) Carry out melting treatment at a temperature of 1400°C, keep warm for 0.5h for clarification, and then quickly pour the basic glass solution into water for quenching to obtai...

Embodiment 2

[0032] The glass-ceramic material is prepared from the sulfur-fixed bottom ash raw material of the 300MW circulating fluidized bed unit of Yunnan Huadian Inspection Division Power Generation Co., Ltd. The chemical composition of the raw material is shown in Table 2, and the specific operation steps are as follows:

[0033] Table 2 Composition of sulfur-fixed bottom ash of 300MW circulating fluidized bed unit of Yunnan Huadian Inspection Division Power Generation Co., Ltd.

[0034] Element

SiO 2

Al 2 o 3

CaO

SO 3

MgO

TiO 2

Fe 2 o 3

Na 2 o

K 2 o

content(%)

10.7

7.9

56.7

17.3

1.93

0.73

3.66

—

0.79

[0035] (1) According to Al 2 o 3 2 2 The powder is ground and mixed evenly, and the percentages are all percentages by mass.

[0036] (2) Carry out melting treatment at a temperature of 1400°C, keep warm for 0.5h for clarification, and then quickly pour the basic glass solution into...

Embodiment 3

[0041] see figure 1 In this example, the steps of the method for preparing glass-ceramic materials with high-calcium-sulfur-fixing fly ash are as follows.

[0042] (1) Composition adjustment: use high-calcium sulfur-fixing fly ash as the main material, and add SiO to the main material 2 Auxiliary material and / or CaO auxiliary material and mix homogeneously to obtain mixed material; In described mixed material, Al 2 o 3 2 2 The auxiliary material can be quartz sand, quartz tailing sand or waste glass, and the CaO auxiliary material can be limestone or quicklime.

[0043] (2) Electric melting: put the mixture into a resistance melting furnace to melt into a glass solution, the temperature in the resistance melting furnace is higher than 1400°C, and the melting time is 30 minutes.

[0044] (3) Water-cooling and quenching the glass solution to obtain granular molten slag.

[0045] (4) Dry, pulverize and grind the granular slag to a particle size of less than 0.5 mm, and then fil...

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Abstract

The invention relates to a method for preparing a glass ceramic material with high-calcium sulfur-fixing flyash. The actual addition rate of flyash in existing vitrification of flyash of a pulverized coal furnace and preparation of glass ceramic materials is low. The method is characterized by comprising the steps of (1), using high-calcium sulfur-fixing flyash as a main material, adding SiO2 auxiliary material and/or CaO auxiliary material into the main material, and mixing well to obtain a mixture, wherein in the mixture, Al2O3 is <15%, 40%<SiO2<60% and 20%<CaO<45%; (2), adding the mixture into a resistance melting furnace, and melting it into glass melt; (3), water-quenching the glass melt to obtain slag; (4), drying, crushing and grinding the slag to a particle size of 0.5 mm and below, and loading to a refractory mold; (5), nucleating, and crystallizing; (6) demolding, grinding and polishing to obtain the finished product. The solid waste high-calcium sulfur-fixing flyash can be effectively utilized to a maximum extent.

Description

technical field [0001] The invention relates to a method for disposing and reusing high-calcium-sulfur-fixing fly ash, in particular to a method for preparing glass-ceramic materials with high-calcium-sulfur-fixing fly ash, which belongs to the field of disposal and comprehensive utilization of industrial solid waste . Background technique [0002] High-calcium sulfur-fixing fly ash and slag are mixed with sulfur-containing coal and sulfur-fixing agent (usually limestone powder) in a certain proportion in the production process of ordinary circulating fluidized bed furnace or pressurized circulating fluidized bed furnace, The solid waste produced after burning sulfur in the bed boiler at 875℃~950℃. Because it belongs to medium-temperature combustion, a large amount of desulfurizer is added in the combustion process, resulting in a large difference between the obtained high-calcium sulfur-fixed fly ash and ordinary pulverized coal furnace fly ash, such as CaO, SO 3 High con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/06C03C10/04C03B32/02
CPCC03C10/0063C03B32/02C03C10/0036
Inventor 王群英宋明光陈仕国
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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