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Agglomeration method for synthesizing mullite by using high aluminous fly ash

A technology for synthesizing high-alumina fly ash and mullite is applied in the field of synthesis of refractory and ceramic materials, which can solve the problems of waste of resources, low conversion rate of mullite, high price of organic raw materials, etc., so as to save mineral resources and Energy, the effect of reducing production costs

Active Publication Date: 2005-11-16
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages are higher energy consumption and expensive organic raw materials used in the organogel process
The mineral phase transition method is made by calcining high-bauxite, kaolin, pyrophyllite and other natural minerals in a kiln at high temperature. The disadvantage of this method is that in addition to high energy consumption, there is also a gap between its mineral composition and mullite composition Larger differences lead to low conversion rate of mullite and waste of resources

Method used

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  • Agglomeration method for synthesizing mullite by using high aluminous fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the production steps of synthetic mullite M70 are:

[0031] (1) Select Al 2 o 3 The content is 52%, SiO 2 The content is 38%, Fe 2 o 3 The high-aluminum fly ash with a content of 2.5% is the main raw material, and the Fe 2 o 3 The content is less than 1.5%.

[0032] (2) The high-alumina fly ash and high-alumina bauxite after iron removal are mixed, so that Al in the mixture 2 o 3 The content is 67.7%.

[0033] (3) Send the mixture into a ball mill and pulverize it into a material with an average particle size of less than 15 μm.

[0034] (4) Add water to the material and mix it, and press it into a blank with a size of 120mm×60mm×70mm by a 350t friction press.

[0035] (5) Send the shaped billet into a kiln at 100°C to dry until the residual moisture is lower than 1%.

[0036] (6) Put the dried blank into a high-temperature tunnel kiln for sintering and synthesis, the sintering temperature is 1650°C, keep warm for 6 hours, and after the kiln bod...

Embodiment 2

[0037] Embodiment 2: In the production step of synthesizing mullite M60, remove Al in the mixture when batching 2 o 3 The content is 59.7%, and the sintering temperature in the high-temperature tunnel kiln is 1600 ℃, other is the same as embodiment 1.

Embodiment 3

[0038] Embodiment 3: In the production step of synthesizing mullite M50, remove Al in the mixture when batching 2 o 3 The content is 50.4%, and the sintering temperature in the high-temperature tunnel kiln is 1550° C., the others are the same as in Example 1.

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Abstract

A process for synthesizing mullite by sintering high-Al powdered coal ash includes magnetic dressing for removing Fe, proportionally mixing it with high-Al alumina, pulverizing, die pressing, drying and sintering in tunnel kiln.

Description

technical field [0001] The invention relates to the technical field of synthesis of refractory and ceramic materials, in particular to a method for sintering and combining high alumina fly ash to synthesize mullite. Background technique [0002] Mullite is Al 2 o 3 -SiO 2 It is the only high-temperature stable mineral phase in the system, which has the advantages of high refractoriness, low expansion rate, good chemical and thermal stability, high strength, and creep resistance. It is a refractory and ceramic material with excellent performance, widely used in iron and steel, nonferrous metallurgy, ceramics, semiconductors and other fields. [0003] There are very few natural mullite minerals in nature, and industrial mullite is mainly obtained by artificial synthesis. In the prior art, methods for synthesizing mullite mainly include electrofusion and sintering. The electrofusion method is to melt the mixed raw materials in an electric arc. The disadvantage is that it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185
Inventor 孙俊民姚强赵旭东曹慧芳刘刚王彦武张恩民
Owner TSINGHUA UNIV
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