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Micro-pore mullite lightweight aggregate and preparation method thereof

A lightweight aggregate and mullite technology, applied in the field of refractory materials, can solve problems such as low compressive strength and refractoriness, uneven distribution of pores, and high volume density, and achieve high refractoriness, low cost, and high volume density. small effect

Inactive Publication Date: 2010-04-07
孝义市京山耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of existing mullite lightweight aggregates such as high bulk density, low compressive strength and refractoriness, high thermal conductivity, large pore size, and uneven distribution of pores, the present invention provides a microporous Mullite lightweight aggregate and preparation method thereof

Method used

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  • Micro-pore mullite lightweight aggregate and preparation method thereof
  • Micro-pore mullite lightweight aggregate and preparation method thereof
  • Micro-pore mullite lightweight aggregate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Microporous mullite lightweight aggregate, made of the following raw materials in weight percentage: bauxite raw meal 35%, coal gangue 20%, sawdust 13%, petroleum coke 32%, Fe in the above petroleum coke 2 o 3 Content is 1%, Al 2 o 3 The content is 8%, and the preparation method includes the following steps: (1) respectively crushing bauxite raw meal, coal gangue, sawdust and petroleum coke, and mixing them uniformly; (2) adding water accounting for 80% of the total weight of the above raw materials, and performing wet Grinding; (3) sieve filtration to obtain undersize with a mesh number of 400 and a water content of 15%; (4) molding with a molding pressure of 6 MPa; (5) drying at a temperature of 180° C. for 65 hours; (6) Calcining at 1400°C for 9 days; (7) Crushing; (8) Sieving to obtain mullite lightweight aggregate.

Embodiment 2

[0027] Microporous mullite lightweight aggregate, made of the following raw materials in weight percentage: bauxite raw meal 40%, coal gangue 14%, sawdust 4%, petroleum coke 42%, Fe in the above petroleum coke 2 o 3 Content is 2%, Al 2 o 3 The content is 10%, and the preparation method includes the following steps: (1) respectively crushing bauxite raw meal, coal gangue, sawdust and petroleum coke, and mixing them uniformly; (2) adding water accounting for 85% of the total weight of the above raw materials, and performing Grinding; (3) sieve filtration to obtain undersize with a mesh number of 450 and a water content of 20%; (4) molding with a molding pressure of 8 MPa; (5) drying at a temperature of 200° C. for 75 hours; (6) Calcining at 1450°C for 10 days; (7) Crushing; (8) Sieving to obtain mullite lightweight aggregate.

Embodiment 3

[0029] Microporous mullite lightweight aggregate, made of the following raw materials in weight percentage: bauxite raw meal 38%, coal gangue 16%, sawdust 10%, petroleum coke 36%, Fe in the above petroleum coke 2 o 3 Content is 2%, Al 2 o 3The content is 9%, and the preparation method includes the following steps: (1) respectively crushing bauxite raw meal, coal gangue, sawdust and petroleum coke, and mixing them uniformly; (2) adding water accounting for 82% of the total weight of the above-mentioned raw materials for wet Grinding; (3) sieve filtration to obtain the mesh undersize of 420 meshes, with a water content of 18%; (4) molding, the molding pressure is 7MPa; (5) drying, the temperature is 195°C, and the time is 70h; (6) Calcining at 1425°C for 9 days; (7) Crushing; (8) Sieving to obtain mullite lightweight aggregate.

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Abstract

The invention relates to the field of refractory materials, particularly to a microporous mullite light aggregate and a production method thereof, and solves the problems of the prior art, such as large volume density, poor compression strength and fire resistance, high heat conductivity, large pore size and non-uniform pore distribution. The light aggregate is made from bauxite, coal gangue, sawdust and petroleum coke. The production method comprises the following steps: crushing raw materials respectively, mixing thoroughly, adding water 80-85% the total weight of the raw materials, wet-milling, filtering with a screen mesh, molding under 6-8 MPa, drying at 180-200 DEG C for 65-75 h, calcining at 1400-1450 DEG C for 9-10 days, crushing, and sieving to obtain mullite light aggregate. Theproduct has the advantages of high porosity, less volume density, small average pore size, small heat conductivity, high compression strength and good fire resistance. The product is widely used as heat-insulating material or directly used in work lining and roof of various industrial furnaces such as heating furnace.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a microporous mullite lightweight aggregate and a preparation method thereof. Background technique [0002] It is well known that mullite itself has many excellent physical properties, such as low expansion coefficient, low thermal conductivity, low creep, low dielectric constant, high thermal shock resistance and high temperature strength, etc. These properties of mullite make it suitable for refractory materials, It has been widely used in many fields such as high-temperature structural materials, microelectronic packaging materials, and optical materials, and has important industrial value. Refractory castables with mullite as raw material can be divided into dense aggregate (also known as heavy aggregate) and lightweight aggregate (also known as porous aggregate) according to porosity. Dense aggregate means that the porosity is not greater than 30% aggregate, lightweight ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B14/04
Inventor 王履彬
Owner 孝义市京山耐火材料有限公司
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