The furnace building material of hot galvanizing furnace is the same as that of most industrial heating furnaces.

1. High alumina brick

The Al2O3 content of high alumina brick is more than 58% (mass fraction). It has the advantages of high fire resistance, high temperature structural strength, high density, good chemical stability, etc., but the price is high. It is applicable to the parts directly contacting with the flame whose temperature is often higher than 1000 ℃.

2. Ordinary clay refractory brick

The composition (mass fraction) of ordinary clay refractory brick is: Al2O3 30%~40%, SiO2 50%~65%, impurities 5%~7%, and bulk density 2.1~2.2g/m3. Its high-temperature performance is slightly worse than that of high alumina brick, but its price is cheaper and it is widely used. It is applicable to brickwork of furnace wall, partition wall and furnace bottom with temperature of 500~1000 ℃.

3. Light fireclay brick

The composition of light fireclay bricks is basically the same as that of ordinary fireclay bricks, and the bulk density is 0.4~1.3 g/cm3, mainly! It is characterized by many pores, light weight and good thermal insulation performance. Due to the small pore volume and uniform distribution, the lightweight refractory clay brick still has a certain compressive strength. The lower the density of bricks, the better the thermal insulation performance, but the lower the strength, which can be selected according to the use requirements. The furnace wall is usually composed of light refractory brick layer and ordinary refractory brick layer; There are also successful examples of building furnace walls with light refractory bricks with high strength, but it should be noted whether the refractoriness of the refractory bricks can meet the requirements of long-term high temperature operation.

4. Red brick

Red bricks are fired ordinary clay bricks, which are made of clay, shale, coal mine stone and fly ash. It is characterized by good compressive strength, but not high temperature resistance, poor thermal insulation performance than light refractory bricks, and low price. It can only be used for the furnace bottom, external wall and other parts with temperature below 500 ℃ and the drying tank wall.

5. Aluminum silicate fiber

Aluminum silicate fiber contains Al2O3%~54% (mass fraction), SiO2 47%~53% (mass fraction), and other oxides. It is a fire-resistant and thermal insulation material. It has the characteristics of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small specific heat, mechanical vibration resistance, etc. The operating temperature can reach 1300 ℃. The products include fiber cotton, fiber felt and shaped products. Aluminum silicate fiber felt is widely used. The higher the density, the better the fire resistance and thermal insulation performance.

6. Fireclay

Refractory mud includes ordinary refractory mud and high alumina refractory mud. The latter has higher refractoriness and is mainly used for bricklaying the furnace body of hot-dip galvanizing furnace. Generally, it can be used when water is mixed into mud without adding binder.

7. Refractory concrete

Refractory concrete (also known as refractory castable) is made by mixing, shaping, curing and baking refractory aggregate, powder, binder and binder in a certain proportion, and the service temperature is above 1000 ℃. The commonly used proportion (mass fraction) is roughly 70% of coarse and fine aggregate (high alumina clinker), 10% of fine powder (high alumina clinker powder, 5% of raw refractory clay), and 15% of binder (low calcium aluminate cement of 400 grade or higher); In the mixing process, a proper amount of water (about 10% of the constituent materials) shall be added gradually, until all refractory materials are uniform, and then the forming construction can be carried out. It is suitable for prefabricating various specifications of special-shaped refractory components, fire mouth bricks, etc.

8. Steel

Various ordinary carbon structural steel profiles and plates can be used to manufacture and strengthen the furnace shell and framework of the whole furnace body. The steel column directly supporting the zinc pot shall be made of heat-resistant stainless steel with high temperature oxidation resistance and high temperature creep resistance.