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Clayless refractory mouldable material

A plastic, clay-free technology, applied in the field of refractory materials, can solve the problems of low strength and poor linear change performance of refractory materials, and achieve the effects of high normal temperature strength, good plasticity and wide application range

Inactive Publication Date: 2003-10-22
宜兴天霸非金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since raw clay is the source of plasticity, but its addition makes the refractory material have low strength and poor linear change performance at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, the clay-free refractory plastic used in the furnace wall of circulating fluidized bed boiler furnace fins, its component ratio is: (percentage by weight)

[0014] Brown corundum aggregate 65 parts

[0015] Brown corundum powder 25 parts

[0016] Silica powder <5μm 3 parts

[0017] Amorphous alumina 180-200 mesh 7 parts plus:

[0018] Aluminum phosphate aqueous solution 8 parts

[0019] 1 part citric acid

[0020] After testing, the performance parameters of the clay-free refractory plastic are:

[0021] Bulk density: 2.8-2.9g / cm 3

[0022] Compressive strength (1000℃×3h): ≥100Mpa

[0023] Wear resistance: ≤7cc

[0024] Line change after burning: (1000℃×3h): <-0.3%

Embodiment 2

[0025] Embodiment 2, the clay-free refractory plastic that is applicable to pusher type heating furnace roof, its component proportioning is: (weight percentage)

[0026] 62 parts of first-grade bauxite aggregate

[0027] 24 parts of secondary bauxite powder

[0028] Silica powder <5μm 4 parts

[0029] Amorphous alumina 180-200 mesh 10 parts plus:

[0030] Aluminum sulfate aqueous solution 8.5 parts

[0031] 1.5 parts of oxalic acid

[0032] After testing, the performance parameters of the clay-free refractory plastic are:

[0033] Bulk density: 2.5-2.6g / cm 3

[0034] Compressive strength (1250℃×3h): ≥60Mpa

[0035] Line change after burning: (1250℃×3h): ≤-0.25%

Embodiment 3

[0036] Embodiment 3, the clay-free refractory plastic that is suitable for thermal equipment with higher temperature and larger temperature fluctuations, its component ratio is: (weight percent)

[0037] Mullite aggregate 68 parts

[0038] Mullite powder 20 parts

[0039] Silica powder <5μm 3 parts

[0040] Amorphous alumina 180-200 mesh 9 parts plus:

[0041] Aluminum phosphate aqueous solution 7 parts

[0042] Lignosulfonate 1.8 parts

[0043] After testing, the performance parameters of the clay-free refractory plastic are:

[0044] Bulk density: 2.5-2.6g / cm 3

[0045] Compressive strength (1500℃×3h): ≥90Mpa

[0046] Line change after burning (1450℃×3h): 0--+0.15%

[0047] Thermal shock resistance (1100°C, water cooling): ≥35 times

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Abstract

The present invention relates to a clay-free plasticity refractory material, belonging to the field of refractory material. Its composition includes fire-resistant aggregate, powder material and chemical binding agent, and also contains amorphous Al2O3 fine powder, the described amorphous alumina is obtained by using industrial aluminium hydroxide through the processes of suspension heating at 600 deg.C-700 deg.C and air quenching. Said invention adopts the high-activity amorphous Al2O3 fine powder instead of raw clay to prepare plasticity refractory material, so that its plasticity is good, it is has higher normal temp. strength and excellent linear change property, its refractory aggregate and powder material can be changed for different requirements of thermal engineering equipments.

Description

technical field [0001] The invention relates to a refractory material, especially a clay-free refractory plastic. technical background [0002] Generally, refractory plastic is made of refractory aggregate, powder, raw clay, chemical compound binder and admixture, mixed and kneaded, extruded into a brick shape, and still has good plasticity after being packaged and stored for a certain period of time, and can be pounded. Unshaped refractory materials for construction are mainly used in thermal equipment such as the roof of the heating furnace, the wall of the soaking furnace, and the finned furnace wall of the boiler. Since raw clay is the source of plasticity, but its addition makes the refractory material have low strength and poor linear change performance at room temperature. Contents of the invention [0003] The present invention aims to overcome the above-mentioned deficiencies, and provides a clay-free plastic refractory material, which has good plasticity, high n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/18C04B35/63C04B35/66
Inventor 吴国强钱军峰
Owner 宜兴天霸非金属材料有限公司
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