Low-heat-conduction straight magnesia brick and preparation method therefor

A technology of direct magnesia bricks with low thermal conductivity, applied to clay products, ceramic products, and other household appliances, which can solve the problems of increasing the damage probability of mechanical equipment, the impact of cement kiln safety production, and the increase of clinker unit cost, etc., to achieve repeatable Utilization, improvement of plasticity and reduction of thermal conductivity

Active Publication Date: 2016-09-07
郑州瑞泰耐火科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The temperature in the firing zone of the new dry-process cement rotary kiln is often as high as 1400°C. The refractory materials in this part often use alkaline refractory products. The thermal conductivity of alkaline refractory products is high. The decrease is rapid, and the surface temperature of the cylinder is often overheated. On the one hand, the heat dissipation of the kiln cylinder increases, the heat con

Method used

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  • Low-heat-conduction straight magnesia brick and preparation method therefor
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  • Low-heat-conduction straight magnesia brick and preparation method therefor

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Embodiment 1

[0024] Such as figure 1 and figure 2 As shown, a direct magnesia brick with low thermal conductivity includes a working layer 1 and an insulating layer 2. The working layer 1 and the insulating layer 2 are connected together by pressing. The working layer 1 includes aggregates, powders and binders. Raw materials for the preparation of the working layer are as follows: Aggregate: 10 parts of microporous high-purity magnesia with a particle size of 0-1mm, 20 parts of microporous high-purity magnesia with a particle size of 1-3mm, 10 parts of chrome ore with a particle size of 1-3mm, 15 parts of 3-5mm microporous high-purity magnesia; powder: 25 parts of microporous high-purity magnesia with particle size <0.074mm, 15 parts of chrome ore with particle size <0.074mm; binder: 4 parts of low-sodium silica sol;

[0025] The insulation layer 2 includes aggregate, powder, composite organic pore-forming agent and binder. The raw materials for the preparation of the insulation layer ar...

Embodiment 2

[0035] Such as figure 1 and figure 2 As shown, a direct magnesia brick with low thermal conductivity includes a working layer 1 and an insulating layer 2. The working layer 1 and the insulating layer 2 are connected together by pressing. The working layer 1 includes aggregates, powders and binders. Raw materials for the preparation of the working layer are as follows: Aggregate: 10 parts of microporous high-purity magnesia with a particle size of 0-1mm, 20 parts of microporous high-purity magnesia with a particle size of 1-3mm, 10 parts of chrome ore with a particle size of 1-3mm, 15 parts of 3-5mm microporous high-purity magnesia; powder: 25 parts of microporous high-purity magnesia with particle size <0.074mm, 15 parts of chrome ore with particle size <0.074mm; binder: 4 parts of low-sodium silica sol;

[0036] The insulation layer 2 includes aggregate, powder, composite organic pore-forming agent and binder. The raw materials for the preparation of the insulation layer ar...

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Abstract

The invention relates to a low-heat-conduction straight magnesia brick and a preparation method therefor. The low-heat-conduction straight magnesia brick comprises a working layer and a heat insulating layer, wherein the working layer and the heat insulating layer are connected together through compressing, the working layer is mainly prepared from micropore high-purity magnesite, and partial chrome ores are added; and the heat insulating layer is prepared from heat-insulating materials which are mainly waste/used basic bricks. The preparation method comprises the steps of carrying out wet grinding on the working layer and the heat insulating layer separately, carrying out compression molding on the working layer and the heat insulating layer together so as to obtain an unburned brick, subjecting the unburned brick to drying and baking and then burning for 5 to 15 hours while carrying out heat preservation at the temperature of 1,300 DEG C to 1,560 DEG C, and carrying out natural cooling, thereby obtaining the product. By adopting a complex structure, the product has fire-resistant and heat-insulated dual functions, and the coefficient of thermal conductivity of the product is smaller than that of like products; and proven by tests, when the low-heat-conduction straight magnesia brick disclosed by the invention is applied to a burning zone of a cement kiln, the surface temperature of a tubular body can be lowered and is 20 DEG C to 40 DEG C lower compared with the tubular body using the similar products on the market. According to the low-heat-conduction straight magnesia brick and the preparation method therefor, by virtue of the high-temperature stability of the micropore high-purity magnesite and the erosion resistance of the chrome ores, the service life of the product on motion-mode thermal equipment can be greatly prolonged; and meanwhile, due to the complex structure, the energy saving and consumption lowering effects are obvious.

Description

technical field [0001] The invention relates to the technical field of refractory and environment-friendly materials, in particular to a direct magnesia brick with low thermal conductivity and a preparation method thereof. Background technique [0002] The temperature in the firing zone of the new dry-process cement rotary kiln is often as high as 1400°C. The refractory materials in this part often use alkaline refractory products. The thermal conductivity of alkaline refractory products is high. The decrease is rapid, and the surface temperature of the cylinder is often overheated. On the one hand, the heat dissipation of the kiln cylinder increases, the heat consumption of clinker increases, and the unit cost of clinker increases; on the other hand, the cylinder is easily heated and expanded. The temperature of the cylinder is overheated, and sometimes it is necessary to use spray water to cool down. At the same time, it also increases the damage probability of mechanical ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622C04B35/047C04B35/63C04B33/132C04B38/06
CPCC04B33/1324C04B35/047C04B35/622C04B35/6316C04B35/66C04B38/06C04B2235/9607Y02P40/60
Inventor袁林李沅锦李全有郑建立曹伟
Owner郑州瑞泰耐火科技有限公司