Method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum

A technology of desulfurized gypsum and toughened ceramics, which is applied in the field of preparing anorthite toughened ceramics by using desulfurized gypsum, which can solve the problems of product toughness to be improved, high energy consumption for firing, and scarcity of high-quality raw materials, so as to save resource consumption and reduce liquid phase The effect of forming temperature and improving physical and chemical properties

Inactive Publication Date: 2013-11-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing anorthite-toughened ceramics using desulfurized gypsum, which can significantly improve ceramic products in view of the current problems in the ceramic industry such as high firing energy consumption, product toughness to be improved, and high-quality raw materials are increasingly scarce. Toughness, effective use of waste, lower ceramic firing temperature

Method used

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  • Method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum
  • Method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum
  • Method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum

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Embodiment 1

[0025] A method for preparing anorthite toughened ceramics by utilizing desulfurized gypsum:

[0026] (1) In terms of weight percentage, mix 30% of desulfurized gypsum and 70% of ceramic blank (chemical composition as shown in Table 1), and wet ball mill to mix the raw materials evenly; desulfurized gypsum is calcium sulfate type flue gas desulfurization waste residue, the main component is calcium sulfate , residual limestone and calcium oxide, wherein the weight content of calcium sulfate is 60%;

[0027] (2) Grinding and drying the slurry in step (1), and dry pressing to obtain a ceramic green body;

[0028] (3) The ceramic green body is fired in a kiln, the firing temperature is controlled at 1180°C, and the high temperature holding time is 90 minutes to prepare ceramic samples.

[0029] Table 1. Chemical composition of ceramic blanks (wt%)

[0030] components

SiO 2

Al 2 o 3

K 2 o

Na 2 o

Fe 2 o 3

MgO

CaO

loss

...

Embodiment 2

[0037] A method for preparing anorthite toughened ceramics by utilizing desulfurized gypsum:

[0038](1) In terms of percentage, mix 20% of desulfurized gypsum and 80% of ceramic blank (chemical composition as shown in Table 2), and wet-mill to mix the raw materials evenly; the desulfurized gypsum is calcium sulfate-type flue gas desulfurization waste residue, the main component Calcium sulfate, residual limestone and calcium oxide, wherein the weight content of calcium sulfate is 82%;

[0039] (2) Grinding and drying the slurry in step (1), and dry pressing to obtain a ceramic green body;

[0040] (3) The ceramic green body is fired in a kiln, the firing temperature is controlled at 1200°C, and the high temperature holding time is 50 minutes to prepare ceramic samples.

[0041] Table 2 Chemical composition of ceramic blanks (wt%)

[0042] components

[0043] In Table 2, the firing temperature of the billet in the original ceramic factory is 1280°C. According to th...

Embodiment 3

[0045] A method for preparing anorthite toughened ceramics by utilizing desulfurized gypsum:

[0046] (1) In terms of weight percentage, mix 10% of desulfurized gypsum and 90% of ceramic blank (chemical composition as shown in Table 3), and wet-mill to mix the raw materials evenly; the desulfurized gypsum is calcium sulfate-type flue gas desulfurization waste residue, mainly The composition is calcium sulfate, residual limestone and calcium oxide, wherein the weight content of calcium sulfate is 75%;

[0047] (2) Grinding and drying the slurry in step (1), and dry pressing to obtain a ceramic green body;

[0048] (3) The ceramic green body is fired in a kiln, the firing temperature is controlled at 1220°C, and the high temperature holding time is 30 minutes to prepare ceramic samples.

[0049] Table 3 Chemical composition of ceramic blanks (wt%)

[0050] components

[0051] In Table 3, the firing temperature of the blank in the original ceramic factory is 1300°C. A...

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Abstract

The invention discloses a method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum. The method comprises the following steps of: uniformly mixing 5wt%-30wt% of desulfurized gypsum and 70wt%-95wt% of ceramic blank in a wet-process ball milling manner, wherein the desulfurized gypsum is calcium sulfate type flue gas desulfurization waste residue; grinding and drying the slurry, and preparing the ceramic green blank by dry-pressing and forming; sintering the ceramic green blank in a kiln, controlling the sintering temperature at 1180 -1260 DEG C, and preserving the heat for 30-90 minutes to prepare the anorthite toughened ceramic. The ceramic test sample which is prepared from the method disclosed by the invention adopts anorthite and mullite as the principal crystalline phase, and adopts cristobalite as the secondary crystalline phase, so that the crystalline phase structure is matched with the thermal expansion coefficient of the feldspathic glass which is used as the binding phase better, and therefore, the micro cracks generated in a ceramic sintering process can be reduced, and the impact strength of the ceramic product is improved. Besides, the method can be used for achieving the purposes of utilizing the waste, saving the ceramic production energy consumption and improving the product performance.

Description

technical field [0001] The invention relates to the preparation of silicate ceramics, in particular to a method for preparing anorthite toughened ceramics by using desulfurized gypsum. Background technique [0002] China is a big country in the production and export of ceramics, and the output of construction and daily-use ceramics ranks first in the world for many years. At present, the major challenges facing the ceramic industry mainly include: the firing temperature of ceramic production is relatively high, and the energy consumption is relatively high; the impact strength of ceramic products is relatively low, and the toughness needs to be improved; high-quality ceramic raw materials are increasingly scarce. The main crystal phase of traditional silicate ceramics including daily-use ceramics and building sanitary ceramics is cristobalite (α‐SiO 2 ) and mullite (Al 6 Si 2 o 13 ), the binder phase is feldspar glass phase. The thermal expansion coefficient of cristoba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/22C04B35/185C04B35/622
Inventor 张志杰谢欣刘平安钟明峰
Owner SOUTH CHINA UNIV OF TECH
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