High intensity low conductivity magnesium aluminate spinel brick

Abstract

The invention relates to a high intensity low conductivity magnesium aluminate spinel brick. The high intensity low conductivity magnesium aluminate spinel brick comprises the following ingredients: 20-25% magnesium aluminate composite material with granularity of 5-3 mm, 20-25% magnesium aluminate composite material with granularity of 3-1 mm, 12-16% fused magnesite with granularity of 1-0 mm, 12-16% fused magnesite with granularity of 180 F, 10-12% magnesium aluminate composite material with granularity of 180 F, 4-8% fused magnesium aluminate spinel with granularity of 180 F, 2-5% Alpha-Al2O3 fine powder, and calcium lignosulphonate which accounts for 3.5-5 weight percentage of the raw material. The high intensity low conductivity magnesium aluminate spinel brick is suitable for cement rotary kiln, has good sintering performance, thermal shock resistance, erosion resistance and permeating resistance, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a high-strength and low-magnesia aluminum spinel brick. Background technique [0002] As we all know, cement enterprises are high-energy-consuming industries. With the arrival of the power peak period, cement enterprises will be restricted by power cuts, which will affect the normal operation of cement enterprises, resulting in reduced production and unstable operation of rotary kilns. [0003] In order to cooperate with the "green refractory" strategy and realize "excellent variety quality, resource and energy conservation, environmental protection in the production process, and harmless use process", high-strength and low-conductivity magnesium-aluminum spinel bricks will replace the traditional cement kiln bricks. Magnesium-aluminum spinel brick products, traditional products are heavy materials, with high thermal conductivity, about 3.0 W / m·℃, when us...

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Problems solved by technology

[0002] As we all know, cement enterprises are high-energy-consuming industries. With the arrival of power peak period, cement enterprises will be constrained by power cuts, which will affect the normal operation of cement enterprises. Factors such as the reduction in production and the unstable operation of the rotary kiln

[0003] In order to cooperate with the "green refractory" strategy and realize "excellent variety quality, resource and energy conservation, environmental protection in the production process, and harmless use process", high-strength and low-conductivity magnesium-aluminum spinel bricks will replace the traditional cement kiln bricks. Magnesium-aluminum spinel brick products, traditional products are heavy materials, with high thermal conductivity, about 3.0 W / m·℃, when used in cement kiln, the temperature of cement kiln cylinder reaches 380℃, which is easy to cause The deformation of the cylinder affects the service life of the refractory material, limits the operating rate of the kiln, and also causes a waste of energy, especially the excessive consumption of standard coal

This will easily cause the temperature of the cement kiln shell to be high and the shell to be deformed, which will affect the service life of the refractory material and cause a waste of energy

Cement enterprises are gradually transforming to "low energy consumption and low pollution", and the demand for refractory materials in the transition zone of cement rotary kiln has further increased. The performance of traditional magnesium aluminum spinel products can no longer meet the requirements.

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