andalusite Bricks

Andalusite brick is a refractory material with andalusite as the main raw material. The main raw materials are corundum and andalusite, etc., and the raw material particle size needs to be strictly controlled. It is prepared by adopting new process flow including multi-stage batching, matrix homogenization, and determination of the optimal calcination temperature. It has excellent high temperature resistance, wear resistance and corrosion resistance, as well as excellent thermal shock resistance. This brick can remain stable in a high temperature environment and is not easy to deform or break. During the production process, it is formed by adding additives such as mullite and kyanite, and is formed by high pressure molding, drying and firing at a high temperature of 1500℃. Its refractoriness can reach more than 1800℃, and it can be converted into mullite at high temperature, further improving its refractoriness. In addition, it also has good mechanical strength, thermal shock resistance, slag resistance and chemical stability, and is even insoluble in hydrofluoric acid, showing its extremely high chemical corrosion resistance. This material is mainly used in industry to withstand high temperatures, especially in high-temperature working environments such as blast furnaces and hot blast furnaces.

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Description

Andalusite bricks are made of andalusite, sillimanite sand, activated alumina powder and fine high-alumina powder. First, 40% of andalusite with a particle size of 0.1-1mm and 20% of sillimanite with a particle size of 0.1-1mm are taken. The 120-mesh activated alumina pink andalusite refractory bricks will be converted into mullite after heating. After conversion, they have higher refractory performance. The refractoriness can reach above 1800℃. There are very few impurities in andalusite bricks, and the high-temperature strength decreases very little. It also has the characteristics of resistance to rapid cooling and heating, high mechanical strength, strong resistance to thermal shock, strong resistance to slag, high load conversion point, and extremely high chemical stability (even insoluble in hydrofluoric acid) and extremely strong resistance to chemical corrosion.

Andalusite has high temperature resistance and stability. When heated to 1350℃ under normal pressure, andalusite begins to transform into needle-shaped mullite. Mullite crystal is the only stable form of aluminosilicate under high temperature.

Andalusite bricks use corundum, andalusite and other materials as main raw materials and strictly control the particle size of raw materials. New technology is applied, and multi-level batching, matrix homogenization, determination of optimal calcination temperature and other process measures are adopted. Andalusite bricks with excellent performance can fully meet the use of different parts and different working environments of blast furnaces and hot blast stoves.

The characteristic of andalusite bricks is that the thermal expansion rate is generally low during the conversion process. Andalusite bricks are divided into two types, one is fired andalusite bricks, and the other is unfired andalusite bricks.

project	Sillimanite physical and chemical indicators	Andalusite brick physical and chemical indicators
	HX-WH23	HX-WH31	HX-WB-23	HX-WB-21
Bulk density/(kg/m³)	≥2550	≥2600	≥2600	≥2700
Apparent porosity/%	15-19	15-16	≤19	≤18
Compressive strength/MPa	80-95	≥100	≥80	≥90
Softening temperature under load/℃	＞1650	＞1670	＞1650	＞1650
Refractoriness(0.6%)/℃	＞1790	＞1790	＞1790	＞1790
Creep(1450℃,50h)/%	0.158-0.5		0.2-0.5	0.12-0.3
Thermal shock stability/times	＞10
Al₂O₃/%	≥65	＞55	＞65	≥75
Fe₂O₃/%	0.8-1.5	0.8-1.1	＜1.5	＜1

Item	Indexes
SiO₂ %	28
Al₂O₃ % ≥	60
Fe₂O₃ % ≤	1.0
R₂O % ≤	1.0
Refractoriness ℃ ≥	1790
0.2MPa RUL ℃ ≥	1600
PLC(1400℃x2h)%	0~+0.3
AP % ≤	20
BD g/cm³ ≥	2.5
CCS Mpa ≥	50
Thermal stability (1100℃ water cooling) ≥	12

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