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Heat-insulating composite wear-resistant brick

A wear-resistant brick and unit technology, which is applied in the field of refractory brick production, can solve problems such as powdering and falling off of silicon-calcium board, increase of tertiary wind heat loss, and rise of cylinder surface temperature, and achieve good thermal shock stability and low thermal conductivity coefficient, the effect of preventing oxidation

Pending Publication Date: 2021-08-03
HUBEI UNIV OF EDUCATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inner wall of the tertiary air duct of a cement kiln is generally protected by two layers of inner refractory bricks and outer calcium silicate boards; this design structure, after a period of use, the calcium silicate board is prone to powdering and falling off , leading to the draw and collapse of refractory bricks on the top of the three air ducts
After the silicon-calcium board is pulverized and falls off, the heat insulation layer disappears, which will inevitably lead to an increase in the external temperature of the cylinder, increased heat dissipation on the external surface of the cylinder, and an increase in tertiary wind heat loss

Method used

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Examples

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Effect test

Embodiment 1

[0052] Provided in the present invention is a preparation method of a heat-insulating composite wear-resistant brick, and the preparation method is as follows:

[0053] 1), put the dried ceramsite and expanded vitrified microbeads into the ball mill in proportion to grind into 180 mesh fine powder, and put them into the warehouse for storage;

[0054] 2), put the magnesium-aluminum spinel, alumina hollow sphere, silicon carbide, the material made in step 1 into the mixer in proportion to stir, and the time is 10-15min;

[0055] 3), in the process of stirring in step 2, add admixture, binder and water reducing agent successively, and continue stirring, and the time is 30min, to prepare material;

[0056] 4), the material in step 3 is shaped through a mold, and then put into a drying kiln for drying for 24-72h;

[0057] 5), put the model made in step 4 into a high-temperature kiln, sinter at a high temperature of ≧1500 ℃, calcinate for 72 hours, cool down after 72 hours, and ta...

Embodiment 2

[0059] For the production method of traditional high alumina refractory bricks:

[0060] 1. First put the raw high alumina bauxite into a high temperature kiln for calcination for 48 hours.

[0061] 2. The calcined high alumina bauxite is crushed and sieved into 5-3, 3-1, 1-0 graded aggregates. The sieved material enters the ball mill and is ground into 180 mesh fine powder, which is put into the silo for use. After drying, the clay raw material is ground into a 180-mesh fine powder in a ball mill for use.

[0062] 3. Take 70-80% high-alumina bauxite clinker and 20-30% high-alumina bauxite raw meal fine powder according to the weight percentage, put them in a mixer and stir evenly, then use a professional mold for pressing and molding, and then put them into drying It is dried in the kiln for 24-72 hours, and finally calcined in the high-temperature kiln for 72 hours.

[0063] Before 2010, my country's cement kiln production line was mainly based on 2500 tons of clinker / day...

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Abstract

The invention relates to the technical field of refractory brick production, and discloses a heat-insulating composite wear-resistant brick which main raw materials (by weight), comprising 70-75% of magnesium aluminate spinel, 20-25% of alumina hollow spheres and 5-10% of silicon carbide; and auxiliary materials (by weight), comprising 10-15% of ceramsite and 7-8% of expanded and vitrified micro beads. According to the heat-insulating composite wear-resistant brick provided by the invention, a wear-resistant layer is prepared from spinel and aluminum oxide hollow spheres, together with a chemical binding agent; a heat-insulating layer is made of ceramsite and vitrified micro beads, together with a chemical binding agent; and a heat-insulating material and a fire-resistant material are formed through molding and high-temperature firing by adopting an independent stirring, mixing and grinding process, so that the heat-insulating property and the fire-resistant property are organically combined. Wear resistance, high temperature resistance and heat insulation are integrated, the running time of equipment can be greatly prolonged, energy is saved, heat preservation is achieved, high temperature resistance is achieved, long-term use is achieved, and energy is saved and consumption is reduced; and the requirements of the inner walls of a tertiary air pipe and a preheater cylinder for thermal insulation and fire resistance in the cement production process can be well met.

Description

technical field [0001] The invention relates to the technical field of refractory brick production, in particular to a heat-insulating composite wear-resistant brick. Background technique [0002] With the country's need for resource protection and efficient use of resources, the country has issued a series of laws and regulations on energy conservation and environmental protection; the cement industry is a high-energy-consuming industry, so it is more urgent to eliminate outdated production processes; large-scale, automated, intelligent, energy-saving and environmental-friendly Chemicalization is the development direction of the cement industry. For example, the production capacity of less than 2,500 tons of clinker / day will be eliminated, and the production capacity of more than 5,000 tons of clinker / day will be promoted. With the increase of production capacity, the diameter of the tertiary air duct and preheater increases; the traditional tertiary air duct and preheater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/626
CPCC04B35/443C04B35/62675C04B2235/3217C04B2235/3826C04B2235/36C04B2235/3418C04B2235/3463C04B2235/96C04B2235/77C04B2235/9607
Inventor 刘云才张全权余国山
Owner HUBEI UNIV OF EDUCATION
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