The blast-furnace crucible overall pouring repair technology is a new technology for quickly reconfiguring the blast-furnace crucible ceramic cup and the safe heat transfer structure. In the later stage of the blast-furnace crucible, the initial ceramic cup disappears, the carbon brick layer becomes thinner due to dissolution, wear and erosion, the heat flux of the heat dissipation of the hearth becomes larger, and the carbon brick directly contacts the molten iron, and the carbon brick continues to be thinned and permeable. The hidden danger of leaking iron. The technical solution directly casts a layer of a whole seamless ceramic cup which is resistant to high temperature, slag-resistant and insoluble in molten iron on the thin carbon brick layer of the crucible, and eliminates the filling layer between the traditional ceramic cup and the carbon brick. The structure of the hearth is more compact, and the direct contact between the carbon brick and the molten iron prevents the carbon from being dissolved and reduces the heat flow heat flow of the crucible, and forms a new, stable and effective furnace heat transfer system, while the 1150 °C condensation iron isotherm leaves. The surface of the carbon brick is offset from the inside of the furnace to the inner surface of the newly cast integral ceramic cup, thereby achieving safe and long life of the crucible.

Product category:

High heat-conducting castable: The product is mainly made of Nano sol with carbon fiber material with good thermal conductivity as the bonding agent; its thermal conductivity is similar to that of carbon brick, and it has excellent anti-slag iron wetting property and self-flow property, so it can easily realize narrow gap. Self-flowing and compacting, this product can be used for carbon brick repair, filling carbon bricks with cooling wall gaps, leveling the bottom of the furnace, filling the gap between ceramic cup and carbon brick.

Crucible castable: This product uses high-quality corundum as the main raw material and Nano sol as the binder. The material not only has excellent high temperature resistance, slag-resistant iron erosion, anti-scouring and quick-drying explosion-proof performance, but also has good self-flow pumping performance. The product is used for the overall pouring of ceramic cups in blast furnace hearths.

Tuyere zone castable: This product is specially designed and developed for the environmental characteristics of the blast furnace tuyere; this product is made of high-quality corundum as the main raw material and Nano sol as the bonding agent; the product not only has excellent high temperature resistance, erosion resistance, mechanical wear resistance and the like. And has good self-flow pumping performance.

Crucible pouring characteristics:

1.         The integrally poured ceramic cup solves the problem of the gap between the traditional corundum-mullite ceramic cup and the carbon brick, so that the overall structure of the hearth is tighter, the thermal resistance layer is reduced, the overall heat conduction efficiency is improved, and the hearth is protected. In addition, the 1150 °C condensation iron isotherm is transferred to the inside of the cast ceramic cup, and the carbon brick is effectively isolated and protected. In short, the furnace is safely protected, the furnace heat loss is reduced, and the furnace life is prolonged.

2.         It can effectively retain the residual qualified carbon bricks, and the carbon bricks which are partially eroded locally can be repaired with high thermal conductivity castables. Therefore, compared with the rebuilding of carbon bricks, the repair period is short and the cost is low;

3.         Due to the overall pouring, the residual brick lining of the tuyere can be utilized to the greatest extent, the refractory consumption can be reduced, and the influence of the brick joint on the tuyere can be effectively avoided, and the risk of the tuyere gas is reduced.

4.         Due to the use of Nano sol combined with corundum silicon carbide castable, it can be quickly burned and explosion-proof, and has better resistance to molten iron corrosion, slag resistance, permeability resistance and alkali metal corrosion resistance compared with traditional ceramic cup bricks. The property and the thermal conductivity are moderate, which is more conducive to the formation of the slag iron viscous layer.

5.         Due to the overall pouring, seamless connection reduces the chance of iron penetration.

6.         Pumping and pouring, convenient construction, short demolding time, can be quickly resumed.

Main construction techniques:

1.         Remove floating ash from hearth surface with oxygen tube.

2.         Repair the damaged area of the furnace carbon brick with high thermal conductivity self-flowing castable.

3.         Determine the centerline and then install the grinding tool for pouring.

4.         Using pumping pouring, pumping efficiency at least 13t per hour and the mold can be demolded in 12 hours.

5.         The high-end wear-resistant castable material is used to integrally cast the sidewall of the hearth, the bottom of the furnace and the tuyere of the upper part of the hearth. The high-end wear-resistant castable has good resistance to molten iron corrosion and penetration, anti-iron water circulation erosion and alkali resistance. Metal erosion, resistance to thermal stress damage.

6.         Curing the furnace pot casting body.

7.         Demolition of abrasive tools.

8.         Baking cast body.

The refractory castables commonly used in the ironmaking blast furnace and the hot blast stove body can also be divided into clay, high alumina, corundum ultra-low cement or Nano sol combined castables. They are widely used in the overall casting of the hearth, the blast furnace hearth, the belly of the furnace, the annular joint between the furnace refractory brick and the furnace shell, the lining of the hot air duct of the blast furnace and the hot blast stove, the fire of the burner of the hot blast stove, the vault, etc. Circumferential joints between bricks and furnace shells, water-cooled pipes and concrete foundations for blast furnaces and hot blast stoves, etc. The furnace castables produced by our company are made of high quality silicon carbide and corundum as the main raw materials, and various chemical additives and Nano sol are used as binders.

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