What prefabricated parts and castables do lime and dolomite manufacturers use?

The price of lime and dolomite powder are similar in chemical composition and chemical properties, and the calcination temperature is roughly the same. Some enterprises of dolomite sand use the same kiln to burn lime and burn dolomite alternately. There are roughly three types of refractory materials for lining, one is aluminum spinel brick for calcination zone, high alumina brick for dolomite sand transition zone, clay brick for preheating zone, and refractory fiber or light brick for heat insulation layer. , the surface temperature of this type of kiln is 3~35℃, and the lining life is 1~2 years; the calcining zone is a light and heavy composite brick of spinel, the surface temperature of the shell is below 25℃, and the lining life is 2~3 years. Year; the third is to use prefabricated blocks and castables to form a lining, the surface temperature of the shell is also below 25 ℃, and the service life is also 2 to 3 years.

0-10 mesh dolomite sand manufacturers

How much dolomite powder

Baosteel replaced spinel composite bricks with andalusite bricks at 16.1~19.55m of the calcination zone. The surface temperature of the kiln shell was reduced, the weight of the kiln body was reduced, and the performance of the kiln skin was also good. After 2 years of use, the kiln skin and andalusite bricks were well preserved. , The composite spinel brick peeled off seriously. Because andalusite is less dense than spinel, if andalusite bricks are used in the calcination zone, the weight of the kiln body can be reduced by 35t, and the shell temperature can be reduced by 1℃.

The feeding port and the kiln head and kiln tail are impacted and worn by the block material, and are prone to breakage and peeling, which are the parts with short service life. WISCO uses alkali-resistant castables, which can be used for more than 36 months. The castable is made of homogenized bauxite clinker aggregate, silicon carbide 1~mm and fine powder, SiO2, AI2O3 micropowder, and cement combination. Its properties and usage are shown in Table 1.

The calcined zone is made of salt-bonded non-fired composite bricks, the heavy part uses homogenized bauxite clinker as the main aggregate, and andalusite is added as the expansion agent, and the thermal shock resistance, the thermal insulation layer is made of alumina hollow spheres and expanded perlite 2: 1 Ingredients, integral molding, the physical index of the product is shown in Table 2.

The lining structure of two types of bricks using composite bricks and homogeneous bricks with thermal insulation bricks has a service life of more than 3 years, and the problem of overheating of the kiln shell has also been solved. See the performance requirements of salt-bonded unburned bricks.

In 1992, Anshan Iron and Steel changed from chrome bricks to aluminum spinel bricks in 1992, and later changed to composite salt bricks. The double-layer structure was changed to composite structure. The building was changed to dislocation masonry, and later to composite masonry of prefabricated blocks and castables. The prefabricated blocks and castables themselves were embedded with metal anchors, which were directly consolidated on the steel shell. The prefabricated blocks and castables A layer of thermal insulation material is embedded inside, and the kiln shell is lowered from 32 °C to 222 °C. Further improvement is to add a layer of NJS nano-microporous thermal insulation felt in the cylinder to reduce the shell from 22 °C to 176 °C.