Clay Furnace Bricks

The main raw material of clay tank furnace bricks is clay, which is processed through a specific process. It has high refractoriness, good corrosion resistance and mechanical strength, and can remain stable in high temperature and harsh environments. During the manufacturing process of clay tank furnace bricks, some additives, such as degumming agents and delayed-acting coagulants, are usually added to improve the performance of the bricks, such as reducing moisture content, improving organizational structure, and enhancing the uniformity and stability of the bricks.
Its main features: High refractoriness: Good corrosion resistance: High mechanical strength: Good stability:
It also has low permeability and low hydrogen diffusion, which helps prevent gas from passing through the brick body and avoiding damage to the internal structure. These characteristics make clay furnace bricks particularly suitable for masonry of glass melting furnace bottom and wall, as well as blast furnace, hot blast furnace, steel ladle lining and steel pouring system and other thermal equipment.

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Description

Clay refractory materials were once the most widely used refractory materials in glass pond furnaces. With the development of electrocast refractory materials and alkaline refractory materials, the use of clay refractory materials has gradually decreased. Even so, clay bricks still account for a large proportion in glass pond furnaces. Now, in general soda-lime glass pond furnaces, the use of clay bricks is 30-70%.

This is because clay bricks are low in price, have good thermal stability, and are easy to shape and process. Clay bricks are traditional refractory materials.

Clay pond furnace bricks are made by using refractory clay to burn the clinker particles as aggregates, using raw clay as a binder, making the required shape, and then sintering.

Chemical composition

Due to the different raw materials, the chemical composition of clay bricks varies greatly. Its main components are SiO2 and Al2O3. The range of various components is as follows: SiO2 50~70%,

Al2O3 25~45%, Fe2O3 1.0←3.0%, TiO2 1.0~2.5%, R2O+RO 1.0~4.0%.

Products Description

In glass tank furnaces, the bricks used for the regenerator walls and checker bricks are small in size, and it is best to use a high-pressure press to form the products. For large clay tank furnace bricks, tank wall bricks, trough bricks, etc., it is best to use the vacuum exhaust mud injection method.

The erosion of clay tank furnace bricks is mainly affected by the following two aspects. The first is the type of corrosive agent and the chemical reaction rate. The second is the concentration of the reaction product. Of course, this is also related to the structure of the clay bricks and the temperature, time, physical and chemical erosion conditions. The following mainly studies the erosion of clay bricks from the perspective of the type of corrosive agent.

(1) Erosion of clay bricks by alkaline metal oxides

Alkali metal vapor can react with clay bricks at 1000-1100℃ to form a layer of glassy glaze on their surface. This is the reaction of R2O with mullite in clay bricks to form corundum and nepheline glass. The nepheline glass will continue to be affected by R2O to form feldspar glass. If the main component of R2O is K2O, a strong protective layer of high-viscosity potassium nepheline and β-nepheline can be formed on the surface of the clay brick. This will increase the wear resistance of the clay brick. However, if the clay brick contains a low SiO2 content, the glassy glaze layer will peel off after reacting with R2O. This is called alkali peeling.

The dew point of alkali metal vapor is slightly lower than 1400℃. Below this temperature, R2O vapor will condense into liquid. This alkali metal melt will melt SiO2 in the brick, thereby destroying the brick.

The product of the reaction of alkaline earth metal oxides with clay bricks has a low viscosity, so it is difficult to form a glaze protective layer.

(2) Effects of acidic oxides on clay bricks

B2O3 has high viscosity at 900-1200℃ and does not corrode clay bricks much. In glass tank furnaces, it contains more R2O. Therefore, the corrosion of acidic oxides is not obvious.

Brands/ltems	Indexes
	HX-BN-40a	HX-BN-40b
Al₂O₃% ≥	40	40
Fe₂O₃ % ≤	1.5	1.8
PLC(1400℃x2h)%	+0.0 -0.4	+0.0 -0.4
AP % ≤	18	18
BD g/cm³ ≥	2.2	2.2
0.2MPa RUL ℃ ≥	1450	1400
CCS Mpa ≥	49.0	34.3

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