Aluminium Smelting

Anode Baking Furnace Electrolytic Cell

In the Anode Baking Furnace Electrolytic Cell, anode/cathode is attached to the rods that are suspended in the electrolytic cell in a pot room and are slowly consumed in the aluminium making process. These anode/cathode blocks are baked in natural gas fired baking furnace for several weeks to improve the electrical conductivities characteristics.

Dalmia’s high alumina bricks provide high mechanical strength to withstand extreme environments

These are the solutions for Anode Baking Furnace Electrolytic Cell:

  • High alumina bricks
  • Low cement and ultra-low cement castables.

Special Features

  • High density and low porosity
  • High mechanical strength
  • High spalling resistance

Melting & Holding Furnace

This furnace is used to hold the molten aluminium being transported by overhead cranes through the ladles.

Dalmia’s high alumina precast shapes have high thermal spalling resistance, corrosion and abrasion resistance.

These are the solutions for Melting and Holding Furnace

  • Precast Shapes
  • Castables and high alumina ramming masses

Special Features

  • High thermal spalling resistance, corrosion and abrasion resistance
  • High volume stability at operating temperatures

Electric Arc Furnace

The Electric Arc Furnace (EAF) is a vessel where steel is produced by electro fusion arcing with the help of graphite electrodes. Operating as a batch melting process, the charge materials used for melting are steel scraps, sponge iron, DRI and other such materials, either alone or in combination.

Refractories used in this vessel are exposed to high temperatures which are most severe in the hot spot zones. Thus, refractories for this vessel should have high oxidation resistance, erosion and thermal shock resistance; and the charge pad area should have high impact resistance to withstand the impact of steel scraps fed to the furnace.

There are two types of Electric Arc Furnace (EAF) designs based on Tapping Device –

1.EAF with Launder Tap, where the molten metal is teemed from the furnace through a Launder system.

2.EAF with EBT System, where the molten metal is teemed through a Tap hole device from the bottom of the furnace.

OCL’s Magnesia Carbon bricks with high oxidation resistance are most suited to handle severe temperatures in electric arc furnaces.

These are the solutions for Electric Arc Furnace

  • Magnesia Carbon Bricks.
  • Gunning, Hot Patching and Fettling Masses.
  • EBT Blocks.

We offer complete refractory packages for EAF such as for metal zone, slag zone, hot spot bricks, tap hole tube sleeves along with monolithic refractories. We also offer several qualities in precast refractories that have high thermal shock resistance. Our team of experts recommend qualities based on the types of feed material and operating conditions of the furnace.

Special Features

  • Our EBT tap tubes are made of magnesia carbon with very high purity magnesia and graphite that offer superb oxidation, corrosion and abrasion resistance.
  • For the bottom part of tap tubes which are exposed to high abrasion during tapping of molten steel, our Alumina Silicon Carbide Carbon (ASC) quality bricks have proved to be excellent end bricks for their high abrasion resistance and thermal shock resistance.
  • For use between tap hole block and tap hole sleeve, our ramming masses come with high corrosion resistance, bonding strength and volume stability.
  • For EAF roof delta, our Al2O3-Cr2O3 based castables can withstand operational severity and provide significant improvement of roof life. Our castables are characterized by -
  • Lower permeability structure that can restrict penetration of gases at high temperatures
  • Texture that is made with controlled granulometry in matrix, which gives high abrasion resistance.
  • Al2O3-Cr2O3 solid solution in the matrix that imparts superior corrosion to slag ingress and restricts structural spalling.
  • Purging Plug System

    Purging blocks are fitted at the bottom of the ladle to purge inert gas (Argon) for temperature homogenization, chemistry homogenization and absorbed gas removal.

    OCL’s Purging Plugs have minimal risk of metal infiltration and offer high blowing capacity of 1000-1200 Lt./min.

    We offer a range of high performance Directional Purging Plugs with customized design and secondary metallurgical operations which have been adopted by various steel plants.

    • High Alumina and Alumina Spinel based plugs.
    • Our Purging Plugs are based on tabular Alumina, Alumina Magnesia Spinel and Alumina Chrome based materials.

    Special Features

    • High resistance to slag and abrasion.
    • High thermal shock resistance.
    • Low RTE values.
    • Numbers of purging slits vary from 20-30.
    • slit Thickness of 0.25-0.30 mm.
    • Minimum risk of metal infiltration.
    • High Blowing capacity of 1000-1200 Lt./min.