Castables for Blast Furnace iron ditch

Introduction to the Characteristics and Construction Methods of Castables for Blast Furnace iron ditch

The blast furnace?iron ditch?is the flow path of molten iron, which needs to be built with high temperature resistant refractory castables. Generally, they are ultra-low cement refractory castables. It is a castable refractory castable composed of corundum or high alumina clinker, silicon carbide, carbon, separating agent and admixture, which is mainly used for the inner lining of blast furnace tapping trough.

Properties of iron ditch castables

In order to adapt to the strength of high temperature resistance, iron trench castables have good characteristics, such as high strength, heat shock resistance, etc. The following editor will introduce several types in detail:

1. The first performance of?iron ditch?castables is high temperature resistance, high strength, high enough strength to resist the erosion of molten iron, that is, strong resistance to erosion and erosion of molten iron and slag;

2. Good thermal shock resistance, small change in volume after reheating, and will not cause rupture due to rapid changes in heat during use, and has good stability.

3. Strong anti-oxidation ability, long-term use.

4. It is convenient for construction, and the amount of water added during use is small, which makes the iron ditch?castable have good fluidity, can be baked quickly without bursting, and is easy to repair and dismantle.

5. When in use, it does not react with iron, does not produce harmful gas, and does not stick to slag iron.

Construction method of castable for iron ditch

The iron ditch?castable is a refractory castable used in the lining of the blast furnace iron trough. The iron ditch?castable is used for integral casting when the iron ditch?is built. The main components of the iron ditch?castable are fused corundum, silicon carbide and fixed carbon. Add binders and additives, and use pouring method for construction. the

1. The mold needs to be supported: butter should be evenly spread on the surface of the mold before the mold is supported, the lower mold should be centered on the center of the tap hole, and the mold should be fixed after the calibration is completed.

2. Then make and pour the iron ditch castable: fully stir the castable, then add two-thirds of the water, continue to stir for about 2 minutes, then add another third of the water and stir for 3 minutes, then you can Discharge. The prepared castable is poured by vibration method.

3. After the iron ditch?material is completely hardened, first tap the mold inward with a hammer to loosen the mold, and then lift the mold.

4. Curing for 30-40 minutes to make the water vapor on the inner wall of the iron ditch fully volatilize, and then fire and bake.

5. Check whether there is any problem after the baking is completed. If there is no problem, it can be put into use.

Matters needing attention in the construction of iron ditch castables

Stir in time during construction and use in time. The effect of pouring construction will decrease after a long time. If you can't use it up, you should pay attention to moisture-proof when storing to avoid quality problems in the next use, and the use of iron ditch?castables is mainly In the inner lining of the iron ditch, different places require different refractory castables. During construction, it is necessary to distinguish them well to avoid quality problems caused by wrong choices.

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