Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick

A high-alumina brick and transition zone technology, applied in the field of refractory materials, can solve the problems of high SiC burning loss, high price, heat loss, etc., and achieve the effect of reducing production energy consumption and improving thermal insulation performance.

Inactive Publication Date: 2015-04-29
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of SiC can improve the alkali resistance and thermal shock resistance of the product, but its shortcomings are also obvious
The high content of SiC is not only expensive, but also increases the sintering temperature of the product, which in turn causes more SiC burnin

Method used

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  • Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick
  • Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick
  • Modified high-alumina brick for cold ends of calcining zone and transitional zone of cement kiln and method for preparing high-alumina brick

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Modified high alumina bricks for the cold end of the decomposition zone and transition zone of cement kilns, in terms of weight percentage, include the following preparation materials:

[0015]

[0016] Add 5% of the total weight of the above raw materials phosphoric acid (specific gravity 1.4g / cm 3 ) As a binding agent.

[0017] The above-mentioned materials are mixed and milled according to the proportion. The granules are added first, then the fine powder is added, and finally the binder is added. After mixing and milling, the material is trapped for 4 hours, and then pressed into a drying kiln for drying. The drying temperature is 120°C and the drying time is 24 hours. Then it is sent to a high-temperature tunnel kiln with natural gas as fuel for calcination and heat preservation for 6 hours, and the sintering temperature is 1300℃. That is, the product has a thermal conductivity of 1.0W / (m·K).

Embodiment 2

[0019] Modified high alumina bricks for the cold end of the decomposition zone and transition zone of cement kilns, in terms of weight percentage, include the following preparation materials:

[0020] 35% bauxite particles with a particle size of 5-3mm

[0021] 15% tertiary alumina particles with a particle size of 3-1mm.

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Abstract

The invention relates to a modified high-alumina brick for cold ends of a calcining zone and a transitional zone of a cement kiln and a preparation method of a high-alumina brick. The modified high-alumina brick comprises the following materials: 25-35 percent of tertiary alumina particles with granularity of 5-3mm, 15-25 percent of tertiary alumina particles with granularity of 3-1mm, 10-1 percent of tertiary alumina with granularity of 1-0mm, 20-35 percent of tertiary alumina fine powder with granularity of smaller than 0.088mm, 5-10 percent of primary alumina fine powder with granularity of smaller than 0.088mm, 3-5 percent of andalusite fine powder with granularity of smaller than 0.088mm, 0-6 percent of silicon carbide fine powder with granularity of smaller than 0.088%, 0-4 percent of soft clay with granularity of smaller than 0.088mm, and a binding agent which accounts for 3-7 percent of the gross weight of the above raw materials. The preparation method comprises the following steps: mixing and rolling the raw materials according to proportion, then ageing for 16-24h, pressing for shaping, introducing the shaped material into a kiln to be dried for more than 24h at the temperature of 120-140 DEG C, calcining at the firing temperature of 1300-1400 DEG C, and carrying out heat preservation for 6-8h to obtain the high-alumina brick. The modified high-alumina brick is reasonable in alkali resistance and thermal shock resistance and better in energy-saving and heat-insulating effects.

Description

Technical field [0001] The invention relates to the field of refractories, in particular to a modified high alumina brick for the cold end of a cement kiln decomposition zone and transition zone and a preparation method thereof. Background technique [0002] my country has abundant bauxite resources and ranks among the top in the world. Refractory products made of high alumina bauxite have already been used in cement kilns. However, the alkali enrichment effect of the new dry method cement kiln is obvious. Because of the high aluminum content of ordinary high alumina bricks, the alkali resistance often fails to meet the requirements, and its thermal shock resistance is also insufficient. [0003] At present, the commonly used silicon-moulded bricks often use a large amount of first-grade or even special-grade high alumina bauxite as raw materials, and add SiC with a mass ratio of 10-25%. The addition of SiC can improve the alkali resistance and thermal shock resistance of the pro...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 徐如林王杰曾魏瀚胡建辉周严敦王俊涛叶亚红陈雪峰刘锡俊袁林
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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