BF Repairs



Worldwide, iron-makers are searching harder than ever for high performing technological solutions for blast furnace repairs. It is essential that these repairs prolong the life-campaign of the furnace, ensure good productivity, and postpone investment for the capital relining. Calderys has engineered solutions to provide the following benefits:

  • flexibility in furnace operations
  • shorter downtime for the lining repair
  • reduction in manpower and energy.

A leader in shotcrete technology via platform, Calderys focuses on refractory material selection, the architecture of the lining, and the installation method. The refractory selection takes into consideration the wear factor, the CO resistance, the BF technical characteristics (blast conditions, geometry, charging equipment, position of the melting zone, cooling system efficiency…), and its operating conditions. The condition of the residual lining, cleanliness of the staves surface, and the possible presence of scabs also play a critical role in the performance, adherence, and stability of the new lining.

BF repair by Robot gunning
BF repair by Robot gunning

Calderys manages full BF repair projects worldwide and is an expert in all three repair techniques: dry gunning, shotcreting and casting. Gunning and shotcreting applications are performed either by robot (no people enter the furnace) or manual lifting of the platform allowing to operate at any level of the stack.

On a case by case basis, backed up by a strong commitment to BF furnace operations, Calderys tailors Blast Furnace solutions according to specific local conditions and requirements.

If you want to know more, please contact our Expert!

About Calderys

Our mission is to help you meet your ever increasing production and productivity targets, whilst protecting the safety of your people and the integrity of your equipment. Our focus is to deliver safe, reliable and high performing refractory solutions customized to your needs. Our international production and sales facilities allow us to develop and deliver customized solutions based on monolithic and ready shape monolithic refractory materials worldwide in a fast, efficient, and safe manner.


BF Hearth Grouting

Case studies 01

Calderys develops innovative and efficient solution which seals holes and reinforces refractory linings; ideal for repairing hot spots on the blast furnace shell and gas tracking around the tap-hole.

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Tap-Hole Leading Solutions

Case studies 01

A range of tap-hole clays engineered to meet the demands of the blast furnace industry, the CALDE™ TAP products increase productivity, safety, efficiency, and the service life of the BF hearth.

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