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High-aluminum fly ash honeycomb ceramic and preparation method thereof

A technology of high-alumina fly ash and honeycomb ceramics, which is applied in the direction of ceramic products, ceramic material production, clay products, etc., can solve the problems of low service temperature and limit the application prospect of fly ash, achieve high refractoriness and meet the needs of industrial kilns Furnace requirements, environmental friendliness

Inactive Publication Date: 2018-02-02
HUBEI SHENWU THERMAL ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main chemical composition of fly ash in thermal power plants in my country is: SiO 2 、Al 2 o 3 、Na 2 O, K 2 O, FeO, Fe 2 o 3 , CaO and TiO 2 etc., due to Na in fly ash 2 O, K 2 O, FeO, Fe 2 o 3 The high content of this leads to the lower use temperature of the products prepared by using fly ash, which seriously limits the application prospect of fly ash. How to effectively remove harmful impurities in fly ash and make use of SiO in fly ash 2 and Al 2 o 3 , the preparation of honeycomb ceramics with less impurity content and high refractoriness is a subject with great economic potential

Method used

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  • High-aluminum fly ash honeycomb ceramic and preparation method thereof

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Embodiment 1

[0015] A high-alumina fly ash honeycomb ceramic and a preparation method thereof. First, the high-alumina fly ash is pickled and ball milled. The acid used in the ball mill is a mixed solution of sulfuric acid, hydrochloric acid and nitric acid at a ratio of 2:1:1 to obtain sodium oxide, potassium oxide, and iron oxide. To produce fly ash with low impurity content, 40-90wt% acid-treated high-aluminum fly ash, 50wt% industrial alumina, 5wt% hydroxymethylcellulose sodium, and hydroxymethylcellulose amine are pressed by 2 The mixture of 1:1 was ball-milled for 5 hours, then 15 wt% of the above raw materials were added, kneaded for 8 min, and made into mud, after stirring evenly, 5 wt% of saturated fatty acid was added, stirred for 10 min, extruded, and dried naturally at room temperature for 3 h. Then bake at 60°C for 24 hours, and finally hold at 1550°C for 2 hours to obtain high-alumina fly ash mullite honeycomb ceramics.

[0016] The bulk density of the high alumina fly ash m...

Embodiment 2

[0018] A high-alumina fly ash honeycomb ceramic and a preparation method thereof. First, the high-alumina fly ash is pickled and ball milled. The acid used in the ball mill is a mixed solution of sulfuric acid, hydrochloric acid and nitric acid at a ratio of 2:1:1 to obtain sodium oxide, potassium oxide, and iron oxide. To produce the fly ash with low impurity content, the high aluminum fly ash after the acid treatment of 40wt%, the industrial alumina of 50wt%, the sodium hydroxymethyl cellulose of 5wt%, the hydroxymethyl cellulose amine by 2:1 The mixture was mixed and ball-milled for 2 hours, then 18wt% of water was added to the above raw materials, and kneaded for 10 minutes to make a slurry. After stirring evenly, 5wt% of unsaturated fatty acid was added, stirred for 10 minutes, extruded, and dried naturally at room temperature for 3 hours, and then Bake at 80°C for 18 hours, and finally hold at 1500°C for 2 hours to obtain high-alumina fly ash mullite honeycomb ceramics. ...

Embodiment 3

[0021] A high-alumina fly ash honeycomb ceramic and a preparation method thereof. First, the high-alumina fly ash is pickled and ball milled. The acid used in the ball mill is a mixed solution of sulfuric acid, hydrochloric acid and nitric acid at a ratio of 2:1:1 to obtain sodium oxide, potassium oxide, and iron oxide. To produce fly ash with low impurity content, 50wt% acid-treated high-alumina fly ash, 30wt% industrial alumina, 5wt% sodium hydroxymethylcellulose, and hydroxymethylcellulose amine are mixed in a ratio of 2:1 The mixture was mixed and ball-milled for 0h, and 17wt% of water was added to the above raw materials, and kneaded for 8min to make mud. After stirring evenly, 5wt% of waste engine oil was added, stirred for 10min, extruded, and dried naturally at room temperature for 5h, and then in Bake at 100°C for 12 hours, and finally hold at 1400°C for 2 hours to obtain high-alumina fly ash mullite honeycomb ceramics.

[0022] The bulk density of the high alumina f...

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Abstract

The invention relates to a high-aluminum fly ash honeycomb ceramic and a preparation method thereof. The technical scheme is as follows: high-aluminum fly ash with a low impurity content is prepared by a manner of removing sodium oxide, potassium oxide and iron oxide through performing acid washing on high-aluminum fly ash and performing ball milling, 40-90wt% of the high-aluminum fly ash subjected to acid treatment, 10-50wt% of industrial alumina and 1-5wt% of a binding agent are mixed, ball milling is performed for 2-5h, then water which accounts for 15-20wt% of the above raw materials is added in addition, kneading is performed for 5-8min, and therefore a mud material is obtained, after the obtained mud material is stirred uniformly, 5-8wt% of a lubricating agent is added in addition, stirring is performed for 10-15min, extrusion molding is performed, natural drying is performed for 3-10h under a room temperature, baking is performed for 12-24h under the temperature condition of 60-120 DEG C, finally heat preservation is performed for 2-8h under the temperature condition of 1250-1550 DEG C, and therefore the high-aluminum fly ash mullite honeycomb ceramic is obtained. Accordingto the invention, the high-aluminum fly ash honeycomb ceramic has the advantages of saving resources, being friendly to environments, having a short drying period, being capable of continuous production and the like, and the produced high-aluminum fly ash mullite honeycomb ceramic product has higher strength and thermal conductivity, and has wide social and economic value.

Description

technical field [0001] The invention belongs to the technical field of honeycomb ceramics for heat storage and release, and in particular relates to a high-aluminum fly ash honeycomb ceramic and a preparation method thereof. Background technique [0002] Fly ash is the main solid waste discharged from coal-fired power plants, and it is also one of the largest industrial wastes in my country. With the development of the electric power industry, the discharge of fly ash from coal-fired power plants is increasing year by year. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere. If it is discharged into the water system, it will cause river silting, and the fly ash will Toxic chemicals can also cause harm to human body and living things. At present, the effective utilization rate of fly ash is low, and it is only used in a small amount in the cement industry and refractory industry. Therefore, how to effectively utilize these solid wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/135C04B33/132C04B33/13
CPCC04B33/1305C04B33/132C04B33/1352C04B38/0006C04B2235/77C04B2235/96C04B2235/9607C04B38/0067Y02P40/60
Inventor 郑淏杨晓波徐志鹏
Owner HUBEI SHENWU THERMAL ENERGY TECH