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Method for low-temperature firing of ceramic brick by using high-calcium fly ash

A technology of high-calcium fly ash and ceramic bricks, which is applied in the production, application, and household appliances of ceramic materials. The effect of billet pass rate

Inactive Publication Date: 2017-07-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems of high firing temperature and high production cost.

Method used

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  • Method for low-temperature firing of ceramic brick by using high-calcium fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example uses high-calcium fly ash from a thermal power plant in Xilin Gol League, Inner Mongolia, whose main component is 42.25% SiO 2 , 14.94% Al 2 o 3 , 5.35% CaO and 10.11% Fe 2 o 3 . Production basis of high-calcium fly ash-based environmentally friendly ecological ceramic bricks figure 1 process flow. Firstly, the surface modification pretreatment of high-calcium fly ash was carried out. The high-calcium fly ash was added to 80g / L NaOH solution system, the reaction temperature was 90°C, the liquid-solid ratio was 4, and the reaction time was 1h. Filter and wash the slurry to obtain surface-modified high-calcium fly ash mixed with bentonite, talc, diopside, and heavy calcium carbonate in proportions of 50%, 25%, 20%, 4%, and 1%. Add 35% (35% of the total mass of the slurry after ball milling) water and 0.3% sodium tripolyphosphate (0.3% of the mass of the dry material), and ball mill until it becomes a uniform slurry (after the ball milling, the slurry pa...

Embodiment 2

[0034] This example uses high-calcium fly ash from a thermal power plant in Xilin Gol League, Inner Mongolia, whose main component is 51.45% SiO 2 , 22.30% Al 2 o 3 , 6.63% CaO and 4.47% Fe 2 o 3 . Production basis of high-calcium fly ash-based environmentally friendly ecological ceramic bricks figure 1 process flow. Firstly, the surface modification pretreatment of high-calcium fly ash was carried out. The high-calcium fly ash was added to 90g / L NaOH solution system, the reaction temperature was 100°C, the liquid-solid ratio was 6, and the reaction time was 2h. Filtrate and wash the slurry to obtain surface-modified high-calcium fly ash mixed with pyrophyllite, diopside, bentonite, and heavy calcium carbonate in proportions of 40%, 20%, 24%, 15%, and 1%. Add 48% (48% of the total mass of the slurry after ball milling) water and 0.8% sodium silicate (0.8% of the dry material mass), and ball mill until it becomes a uniform slurry (after the ball milling, the slurry passes...

Embodiment 3

[0036] This example uses high-calcium fly ash from a thermal power plant in Xilin Gol League, Inner Mongolia, whose main component is 55.57% SiO 2 , 21.47% Al 2 o 3 , 5.12% CaO and 6.80% Fe 2 o 3 . Production basis of high-calcium fly ash-based environmentally friendly ecological ceramic bricks figure 1process flow. Firstly, the surface modification pretreatment of high-calcium fly ash was carried out. The high-calcium fly ash was added to a 150g / L NaOH solution system. The reaction temperature was 80°C, the liquid-solid ratio was 3, and the reaction time was 0.5h. The slurry is filtered and washed to obtain the surface-modified high-calcium fly ash and kaolin, potassium feldspar, and pyrophyllite according to the ratio of 40%, 23%, 20%, and 17%, and add 40% (the total amount of slurry after ball milling 40% of the mass) of water and 1% sodium humate (1% of the dry material mass), ball milled to a homogeneous slurry (the slurry after the ball mill passes through a 250 me...

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Abstract

The invention discloses a method for preparing a ceramic brick by using fly ash. The method comprises: 1) adding high-calcium fly ash to a 40-150 g / L soluble alkali solution system, and carrying out a reaction; 2) filtering the slurry obtained after the reaction in the step 1), and washing, wherein the obtained filtration residue is surface modified high-calcium fly ash; 3) grinding the surface modified high-calcium fly ash, clay and a flux raw material; 4) granulating; 5) molding the spherical powder obtained in the step 4), and drying to obtain a ceramic brick billet; and 6) heating the ceramic brick billet, carrying out thermal insulation, and cooling to prepare the ceramic brick. The ceramic brick of the present invention has the low temperature firing characteristic.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial solid waste and the invention of new building ceramic materials, and specifically relates to a new method for comprehensive utilization of high-calcium fly ash of industrial solid waste. Background technique [0002] Fly ash is a kind of solid waste discharged after coal combustion in large-scale thermal power plants, and it has become the largest single source of solid pollution in my country. [0003] High-calcium fly ash is a kind of fly ash with high calcium oxide content discharged from thermal power plants when lignite and sub-bituminous coal are used as fuel. In recent years, with the rapid development of the power industry, more and more large-scale generating units have been put into operation, and more lignite and sub-bituminous coal with high volatile content are used as power fuels. In some areas, the emission of high-calcium fly ash has far exceeded that of low-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/135
CPCC04B33/1352C04B2235/3409C04B2235/3418C04B2235/3463C04B2235/442C04B2235/445C04B2235/96Y02P40/60
Inventor 马淑花罗扬王建宇李洋洋张洋王晓辉郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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