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Process for producing mullite

A mullite and process technology, which is applied in the field of mullite production process, can solve the problems of artificial preparation and inability to obtain directly, and achieve good thermal stability, reduce sintering temperature, and increase bulk density.

Inactive Publication Date: 2019-02-22
靖州县新球实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be obtained directly from nature and needs to be artificially prepared
The prior art provides a wealth of mullite preparation methods, but there is still room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A process for generating mullite, comprising the steps of: a. taking high alumina bauxite and coal gangue as raw materials; b. adding active aluminum oxide to the raw materials, grinding them and stirring them evenly to obtain grinding powder; c. The grinding powder is put into a modified aqueous solution, soaked for 30 hours to obtain a modified grinding powder, and the modified aqueous solution contains an organic acid with a mass fraction of 5% and a fluorine-containing compound of 2%, and the organic acid is oxalic acid or citric acid, The fluorine-containing compound is sodium chloride or potassium fluoride; d. drying and molding the modified grinding powder to obtain a parison; e. calcining the parison, the calcination time is 0.2h, and the calcination temperature is 800 degrees Celsius, Obtain mullite finished product.

Embodiment 2

[0020] A process for generating mullite, comprising the steps of: a. taking high alumina bauxite and coal gangue as raw materials; b. adding active aluminum oxide to the raw materials, grinding them and stirring them evenly to obtain grinding powder; c. Put the grinding powder into the modified aqueous solution and soak for 40 hours to obtain the modified grinding powder. The modified aqueous solution contains an organic acid with a mass fraction of 15% and a fluorine-containing compound of 6%, and the organic acid is oxalic acid or citric acid. The fluorine-containing compound is sodium chloride or potassium fluoride; d. drying and molding the modified grinding powder to obtain a parison; e. calcining the parison, the calcination time is 0.3h, and the calcination temperature is 900 degrees Celsius, Obtain mullite finished product.

Embodiment 3

[0022] A process for generating mullite, comprising the steps of: a. taking high alumina bauxite and coal gangue as raw materials; b. adding active aluminum oxide to the raw materials, grinding them and stirring them evenly to obtain grinding powder; c. The grinding powder is put into a modified aqueous solution and soaked for 35 hours to obtain a modified grinding powder. The modified aqueous solution contains an organic acid with a mass fraction of 10% and a fluorine-containing compound with a mass fraction of 4%, and the organic acid is oxalic acid or citric acid. The fluorine-containing compound is sodium chloride or potassium fluoride; d. drying and molding the modified grinding powder to obtain a parison; e. calcining the parison, the calcination time is 0.25h, and the calcination temperature is 850 degrees Celsius, Obtain mullite finished product.

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PUM

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Abstract

The invention discloses a process for producing mullite. The process comprises the steps that high alumina bauxite and coal gangue are taken as raw materials; activated aluminum oxide is added to theraw materials, and grinding is performed and then uniform stirring is performed to obtain abrasive grinding powder; the abrasive grinding powder is put into a modified aqueous solution for soaking for30-40h to obtain modified abrasive grinding powder, and the modified aqueous solution is prepared from 5-15% of organic acid in percentage by mass and 2-6% of a fluorine-containing compound in percentage by mass; and the modified abrasive grinding powder is subjected to drying and molding to obtain a parison; and the parison is calcined to obtain the finished mullite. Compared with the prior art,the process for producing the mullite can effectively reduce the sintering temperature of the mullite, increases the bulk density of the finished mullite, and the finished mullite has a more suitableparticle size and good dispersity as well as good thermal stability.

Description

technical field [0001] The invention relates to a production process of mullite, in particular to a process for generating mullite. Background technique [0002] Mullite is an emerging high-temperature refractory material, which has the advantages of high melting point, low thermal conductivity and good corrosion resistance, so it is widely used in high-temperature structural materials, structural ceramics, filters and microelectronics and other fields. However, it cannot be obtained directly from nature and needs to be prepared artificially. The prior art provides abundant mullite preparation methods, but there is still room for improvement. In view of this, the inventor obtained a process for generating mullite after intensive research. Contents of the invention [0003] The purpose of the present invention is to provide a process for generating mullite, which enriches the production method of mullite and improves the quality of mullite finished products. [0004] Abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622
CPCC04B35/185C04B35/622C04B2235/3201C04B2235/3217C04B2235/445C04B2235/656C04B2235/6567
Inventor 黄勇邓孟辉尤英
Owner 靖州县新球实业有限责任公司