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Light composite baking-free brick for nitrogen kiln and its preparing method

A lightweight and lightweight aggregate technology, applied in the field of lightweight composite non-fired bricks for nitrogen kilns and their preparation, can solve the problems of shortened lining life, poor thermal shock stability, lining peeling, etc., and achieves bonding strength and High volume stability, strong thermal shock resistance, the effect of improving thermal shock resistance and strength performance

Inactive Publication Date: 2006-08-09
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of alumina lightweight bricks is poor thermal shock stability, which easily leads to peeling of the lining and shortens the life of the lining; the brick needs to be fired at high temperature, so brick making requires high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0018] It adopts a two-layer composite structure, which is composed of a working layer and a body layer of the heat-introducing surface layer. The working layer accounts for 1 / 4, and the body layer accounts for 3 / 4. The working layer is composed of raw materials in the following weight ratio:

[0019] Example

1

2

3

4

Alumina Hollow Ball

45

45

45

45

Silica fine powder

3

5

7

9

Aluminum oxide powder

51

49

47

45

pulp powder

1

1

1

1

Sodium hexametaphosphate (additional)

(concentration 35%)

12

12

12

12

[0020] The body layer is composed of raw materials in the following weight ratio: 45% aluminum oxide hollow balls with a particle size of 0.2-4mm as lightweight aggregate, 54% calcined alumina micropowder with a particle size of less than 0.005mm, adding plasticizer 1% pulp po...

Embodiment 5-7

[0024] It adopts a two-layer composite structure, which is composed of a working layer and a body layer of the heat-introducing surface layer. The working layer accounts for 2 / 5, and the body layer accounts for 3 / 5. The working layer is composed of raw materials in the following weight ratio:

[0025] Among them, the amount of silicon fine powder with a particle size of 0.044mm is 5%, the amount of alumina hollow spheres with a particle size of 0.2-4mm is 40%, 45% and 50% respectively, and the amount of calcined alumina powder with a particle size of less than 0.005mm is respectively 54%, 49% and 44%, plasticizer 1% pulp powder. Aluminum dihydrogen phosphate solution (specific gravity 1.35) is added as a binder, and the fully mixed mud is ready for use. The working layer raw material ratio of embodiment 5-7 is shown in the table below:

[0026] Example

5

6

7

Alumina Hollow Ball

40

45

50

Silica fine powder

5

...

Embodiment 8-9

[0030] A two-layer composite structure is adopted, consisting of a working layer and a body layer of the thermal surface layer, the working layer accounts for 1 / 4, and the body layer accounts for 3 / 4, wherein the working layer is composed of raw materials in the following weight ratios. The raw material ratio of the working layer is shown in the table below:

[0031] Example

8

9

Alumina Hollow Ball

45

45

Silica fine powder

5

5

Aluminum oxide powder

54.7

54

pulp powder

0.3

1

Aluminum dihydrogen phosphate (additional)

(specific gravity is 1.35)

13

13

[0032] In the above table, the particle size of silicon fine powder is 0.074mm, the particle size of alumina hollow sphere is 0.2-3mm, and the particle size of calcined alumina micropowder is less than 0.005mm. Add weight ratio aluminum dihydrogen phosphate solution as a binder, mix well and put the...

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Abstract

The invention discloses a nitrogen kiln using light compounding unburned brick and the manufacture method. It includes working layer, and identity layer. Working layer, which is made up of 40-50% light aggregate, 2-10% silicon fine powder, 44-54% sintering alumina powder, and 0.3-1% paper pulp powder, occupies 1 / 4-1 / 2, and identity layer, which is made up of 40-50% light aggregate, 50-60% sintering alumina powder, 0.3-1% paper pulp power, occupies 1 / 2-3 / 4. When adding material, using clapboard to separate off, adding material into working layer and identity layer, removing the clapboard, taking shaking pressing or machine pressing molding, baking at 150-250 degree centigrade, the product would be gained. The invention would enhance the thermal shock resistance, and high or low temperature combination intensity of light brick.

Description

technical field [0001] The invention belongs to a light-weight refractory product, and mainly relates to a light-weight composite unfired brick for a nitrogen kiln and a preparation method thereof. Background technique [0002] Lightweight refractory products are an important part of the kiln. They are used as heat insulation refractory materials in kilns to reduce energy loss. According to the part used in the kiln, lightweight refractory materials can be divided into two types. One type of lightweight refractory material is used for non-working lining, which is located in the middle layer and outer layer of the kiln wall. This type of lightweight refractory material has high aluminum Lightweight bricks, clay lightweight bricks, diatomite bricks, etc.; another lightweight refractory material is directly used as the working lining, that is, the hot brick lining of the kiln wall. Such lightweight refractory materials include mullite lightweight bricks, oxide Aluminum lightwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/185
Inventor 石干夏熠
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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